Pripyat - DIY Geiger Counter -- Episode 352https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352en-USTelligent Community 12Pripyat - DIY Geiger Counter -- Episode 352https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352Fri, 27 Jul 2018 07:24:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:79125911-6d48-4337-bebc-87364f399a47Matthttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352#commentsCurrent Revision posted to Documents by Matt on 7/27/2018 7:24:00 AM<br /> <table style="display:block;margin:0 auto;width:80%;"> <tbody> <tr> <td style="padding-bottom:12px;"><span><a href="https://www.youtube.com/watch?v=wq8IOTKP8wQ">www.youtube.com/watch</a></span></td> </tr> <tr> <td> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:634px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">Matthew goes atomic punk in this video where he takes some old Soviet surplus Geiger-Muller tubes and builds his own recreation of a Civil Defense-style Geiger counter. The CDV-700 series survey meters were developed in coordination with the US government at the height of the Cold War for deployment to local Civil Defense authorities. With a few off-the-shelf parts, Matthew builds a high-voltage circuit to power the GM tube and uses an Arduino Nano to process the output signal, driving the characteristic click and dancing analog meter, then encloses it in a custom 3D-printed case completing the homage to this mid-20th century piece of vintage tech!</span></p> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;">&nbsp;</p> <table class="jiveBorder" style="border:1px solid #000000;width:100%;" border="1"> <thead> <tr> <th style="background-color:#6690bc;border:1px solid #000000;color:#ffffff;padding:2px;text-align:left;" valign="middle"><strong>Product Name</strong></th> <th style="background-color:#6690bc;border:1px solid #000000;color:#ffffff;padding:2px;text-align:left;" valign="middle"><strong>Quantity<br /></strong></th> <th style="background-color:#6690bc;border:1px solid #000000;color:#ffffff;padding:2px;text-align:left;" valign="middle"><span><a id="e14-product-link-933e5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130&nsku=44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_BUY_KIT" class="e14-embedded e14_shopping-cart-far e14-button" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('933e5'));" data-farnell="31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130" data-newark="44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Kit</a> </span></th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>Perfboard</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-666b1" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=44W3453&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('666b1'));" data-farnell="NULL" data-newark="44W3453" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>110V to 6V center-tap transformer</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-4dbbf" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=93K6544&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('4dbbf'));" data-farnell="NULL" data-newark="93K6544" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>555 timer and socket</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-4ba55" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('4ba55'));" data-farnell="" data-newark="31AC3583" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>0.1uF 50V electrolytic capacitor</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-1a0ba" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=65R3169&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('1a0ba'));" data-farnell="NULL" data-newark="65R3169" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>0.01uF 700VAC film capacitor</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-55f7f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('55f7f'));" data-farnell="" data-newark="78Y8315" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>1N4007 diode</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ba5cf" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1531923,1531923&nsku=83K4250&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_BUY_KIT" class="e14-embedded e14_shopping-cart-far e14-button" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ba5cf'));" data-farnell="1531923,1531923" data-newark="83K4250" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>0.01 uF 1kV ceramic disc capacitor</strong></td> <td style="border:1px solid #000000;padding:2px;">3</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-833a2" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1650710&nsku=80K9098&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('833a2'));" data-farnell="1650710" data-newark="80K9098" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>4.7k resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">4</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ddb05" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ddb05'));" data-farnell="" data-newark="90Y9876" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>12k resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ebef6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ebef6'));" data-farnell="" data-newark="90Y9734" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>100k resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-5f78f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1700931&nsku=17M3627&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('5f78f'));" data-farnell="1700931" data-newark="17M3627" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>BUZ71 MOSFET</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-76402" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=19K8195&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('76402'));" data-farnell="NULL" data-newark="19K8195" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>2-pin screw-on connector set</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-bff1f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=94F8825&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('bff1f'));" data-farnell="NULL" data-newark="94F8825" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>SbM-20U Geiger-Muller tube (any tube will do, but you&#39;ll have to adjust for different input/output voltages)</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>1M resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ce8f6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1170595&nsku=24M1010&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ce8f6'));" data-farnell="1170595" data-newark="24M1010" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>330 resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-df87e" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=58K5042&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('df87e'));" data-farnell="NULL" data-newark="58K5042" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong><span><span><a id="e14-product-link-500f0" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=9206884&nsku=38M2076&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('500f0'));" data-farnell="9206884" data-newark="38M2076" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >2N2222</a> </span>BJT </span></strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ac983" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ac983'));" data-farnell="" data-newark="87K2254" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>Arduino Nano</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-331a6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1848691&nsku=13T9275&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('331a6'));" data-farnell="1848691" data-newark="13T9275" data-comoverride="" data-cmpoverride="" data-cpc="SC09659" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>Piezo buzzer</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-58752" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1022397&nsku=96K6086&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('58752'));" data-farnell="1022397" data-newark="96K6086" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>5V moving magnet analog panel mount meter</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-9d103" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('9d103'));" data-farnell="" data-newark="14J8249" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>SPST panel mount toggle switch</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-dc339" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=24C0562&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('dc339'));" data-farnell="NULL" data-newark="24C0562" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>LED</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-f927d" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=24C0562&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('f927d'));" data-farnell="NULL" data-newark="24C0562" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>Adafruit PowerBoost 1000</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-114c5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=40T9945&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('114c5'));" data-farnell="NULL" data-newark="40T9945" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>LiPo battery</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-80a88" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('80a88'));" data-farnell="" data-newark="26Y8529" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>Wire</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-cffd7" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('cffd7'));" data-farnell="" data-newark="91T1630" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>Solder</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-29453" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=9887130&nsku=93K2260&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('29453'));" data-farnell="9887130" data-newark="93K2260" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>3D Printer Filament</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-bf60d" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('bf60d'));" data-farnell="" data-newark="44AC4181" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Matt Eargle is a cold war nut who loves historical technologies. He just happens to have some old Soviet surplus Geiger tube sitting around.&nbsp;&nbsp; He&rsquo;ll use it to build his own take on a Geiger counter.&nbsp; It will be something like an updated CDV 700 series. The original CDV-700 Series models were in production from 1954 until 1974.&nbsp; Later XXX series models were produced well into the 1980s. In order to build a homebrew version of a Geiger counter, he&rsquo;ll need a couple of components in addition to his Geiger tube.&nbsp; A Geiger tube has a sealed vial inside a sealed glass tube containing an inert gas. You take that and apply a really high potential, the one he&rsquo;s using is about 400 volts. When your particle comes in and strikes the nucleus of the gas inside, it temporarily ionizes that gas, just enough to allow some of that voltage through that it can be measured.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">He&rsquo;ll need a high voltage source to feed his tube.&nbsp; The cathode of the tube will run into an Arduino.&nbsp; Running the high voltage source through batteries will require a transformer.&nbsp; The transformer will require an AC current.&nbsp; The easiest way to create an AC current would be to create a little oscillator with 555 timers and run that into an inductor.&nbsp; The 555 timer will set up in astable mode to produce an alternating signal at 60 Hz that will get amplified by a MOSFET before running into the transformer. The current from the transformer will go into a diode laddering system which will drive the GM tube.&nbsp; The signal from the Geiger tube will run into an NPN transistor.&nbsp; The output pulse of the tube is around 200V, so it needs to have some level of conditioning before it can be counted by the Arduino. Once the output is run into ground they&rsquo;ll have a digital signal that they can feed back into the Arduino.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">He tests the circuit in a breadboard to make sure it works.&nbsp; The output of the Geiger tube is hooked into an oscilloscope.&nbsp; Matt uses an old aircraft instrument, an ADF with a glow in-the-dark radium dial to test to ensure that a signal is outputted to the scope.&nbsp; Now that we know the signal is working, we can condition that signal to create a digital pulse that we can measure and count with the Arduino.&nbsp; The tube output runs through a voltage divider so that it doesn&rsquo;t fry the transistor.&nbsp; All that&rsquo;s left is to 3D print some parts and do some coding using the Arduino IDE.</p> <div style="background:#ffffff;border:1px solid #dadada;margin:0;padding:14px 16px 16px 18px;vertical-align:top;"> <div style="display:inline-block;float:left;padding:0px 25px 8px 0px;"><a href="/challengesprojects/element14-presents/" data-e14adj="t"><img alt="image" src="/e14/assets/legacy/2018/e14PresentsJune818.png" width="180px" /></a></div> <div style="display:inline-block;vertical-align:top;width:70%;"><br /> <p style="margin:0;"><span><a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/" data-e14adj="t">element14 presents</a></span>&nbsp; <strong>|</strong>&nbsp; <span style="padding-right:5px;"><a class="jive-link-wiki-small" href="/challenges-projects/element14-presents/vcp-program/w/documents/3718/vcp-biography-airbornesurfer---matt-eargle" data-e14adj="t">About Matt</a>&nbsp;</span><strong>|</strong>&nbsp; <a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/project-videos/" data-e14adj="t">Project Videos</a></p> </div> </div><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: mosfet, radiation detector, geiger tube, e14presents_airbornesurfer, voltage divider, oscillator, circuit, arduino ide, ac current, gm tube, 555 timer, breadboard, cathode tube, matt eargle, cdv-700 series, npn transistor, vcp, arduino, diode laddering system, friday_release, inductor</div> Episode 352: Pripyat - DIY Geiger Counterhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352/revision/3Wed, 29 Jun 2022 20:16:40 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:79125911-6d48-4337-bebc-87364f399a47kellyhensenhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352#commentsRevision 3 posted to Documents by kellyhensen on 6/29/2022 8:16:40 PM<br /> <table style="display:block;margin:0 auto;width:80%;"> <tbody> <tr> <td style="padding-bottom:12px;"><span><a href="https://www.youtube.com/watch?v=wq8IOTKP8wQ">www.youtube.com/watch</a></span></td> </tr> <tr> <td> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:634px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">Matthew goes atomic punk in this video where he takes some old Soviet surplus Geiger-Muller tubes and builds his own recreation of a Civil Defense-style Geiger counter. The CDV-700 series survey meters were developed in coordination with the US government at the height of the Cold War for deployment to local Civil Defense authorities. With a few off-the-shelf parts, Matthew builds a high-voltage circuit to power the GM tube and uses an Arduino Nano to process the output signal, driving the characteristic click and dancing analog meter, then encloses it in a custom 3D-printed case completing the homage to this mid-20th century piece of vintage tech!</span></p> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;">&nbsp;</p> <table class="jiveBorder" style="border:1px solid #000000;width:100%;" border="1"> <thead> <tr> <th style="background-color:#6690bc;border:1px solid #000000;color:#ffffff;padding:2px;text-align:left;" valign="middle"><strong>Product Name</strong></th> <th style="background-color:#6690bc;border:1px solid #000000;color:#ffffff;padding:2px;text-align:left;" valign="middle"><strong>Quantity<br /></strong></th> <th style="background-color:#6690bc;border:1px solid #000000;color:#ffffff;padding:2px;text-align:left;" valign="middle"><span><a id="e14-product-link-62c60" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130&nsku=44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_BUY_KIT" class="e14-embedded e14_shopping-cart-far e14-button" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('62c60'));" data-farnell="31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130" data-newark="44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Kit</a> </span></th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>Perfboard</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-2e318" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=44W3453&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('2e318'));" data-farnell="NULL" data-newark="44W3453" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>110V to 6V center-tap transformer</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-7cbd1" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=93K6544&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('7cbd1'));" data-farnell="NULL" data-newark="93K6544" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>555 timer and socket</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-1cb1f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('1cb1f'));" data-farnell="" data-newark="31AC3583" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>0.1uF 50V electrolytic capacitor</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-e11bf" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=65R3169&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('e11bf'));" data-farnell="NULL" data-newark="65R3169" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>0.01uF 700VAC film capacitor</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-6e058" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('6e058'));" data-farnell="" data-newark="78Y8315" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>1N4007 diode</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-6c9f6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1531923,1531923&nsku=83K4250&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_BUY_KIT" class="e14-embedded e14_shopping-cart-far e14-button" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('6c9f6'));" data-farnell="1531923,1531923" data-newark="83K4250" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>0.01 uF 1kV ceramic disc capacitor</strong></td> <td style="border:1px solid #000000;padding:2px;">3</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-12b7a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1650710&nsku=80K9098&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('12b7a'));" data-farnell="1650710" data-newark="80K9098" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>4.7k resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">4</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-9f42a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('9f42a'));" data-farnell="" data-newark="90Y9876" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>12k resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-9cecb" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('9cecb'));" data-farnell="" data-newark="90Y9734" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>100k resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-05582" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1700931&nsku=17M3627&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('05582'));" data-farnell="1700931" data-newark="17M3627" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>BUZ71 MOSFET</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-23680" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=19K8195&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('23680'));" data-farnell="NULL" data-newark="19K8195" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>2-pin screw-on connector set</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-bfb20" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=94F8825&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('bfb20'));" data-farnell="NULL" data-newark="94F8825" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>SbM-20U Geiger-Muller tube (any tube will do, but you&#39;ll have to adjust for different input/output voltages)</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>1M resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">2</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-a00e9" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1170595&nsku=24M1010&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('a00e9'));" data-farnell="1170595" data-newark="24M1010" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>330 resistor</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-f037f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=58K5042&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('f037f'));" data-farnell="NULL" data-newark="58K5042" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong><span><span><a id="e14-product-link-ffe32" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=9206884&nsku=38M2076&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ffe32'));" data-farnell="9206884" data-newark="38M2076" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >2N2222</a> </span>BJT </span></strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-77a0b" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('77a0b'));" data-farnell="" data-newark="87K2254" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>Arduino Nano</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-a79e8" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1848691&nsku=13T9275&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('a79e8'));" data-farnell="1848691" data-newark="13T9275" data-comoverride="" data-cmpoverride="" data-cpc="SC09659" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>Piezo buzzer</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-6a98e" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1022397&nsku=96K6086&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('6a98e'));" data-farnell="1022397" data-newark="96K6086" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>5V moving magnet analog panel mount meter</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-c10e6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('c10e6'));" data-farnell="" data-newark="14J8249" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>SPST panel mount toggle switch</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-f5996" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=24C0562&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('f5996'));" data-farnell="NULL" data-newark="24C0562" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>LED</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-6c3ab" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=24C0562&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('6c3ab'));" data-farnell="NULL" data-newark="24C0562" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>Adafruit PowerBoost 1000</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-0765b" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=40T9945&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('0765b'));" data-farnell="NULL" data-newark="40T9945" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>LiPo battery</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ebf98" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ebf98'));" data-farnell="" data-newark="26Y8529" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"> <p style="margin:0;"><strong>Wire</strong></p> </td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-23221" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('23221'));" data-farnell="" data-newark="91T1630" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>Solder</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-19263" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=9887130&nsku=93K2260&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('19263'));" data-farnell="9887130" data-newark="93K2260" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;"><strong>3D Printer Filament</strong></td> <td style="border:1px solid #000000;padding:2px;">1</td> <td style="border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-be624" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('be624'));" data-farnell="" data-newark="44AC4181" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Matt Eargle is a cold war nut who loves historical technologies. He just happens to have some old Soviet surplus Geiger tube sitting around.&nbsp;&nbsp; He&rsquo;ll use it to build his own take on a Geiger counter.&nbsp; It will be something like an updated CDV 700 series. The original CDV-700 Series models were in production from 1954 until 1974.&nbsp; Later XXX series models were produced well into the 1980s. In order to build a homebrew version of a Geiger counter, he&rsquo;ll need a couple of components in addition to his Geiger tube.&nbsp; A Geiger tube has a sealed vial inside a sealed glass tube containing an inert gas. You take that and apply a really high potential, the one he&rsquo;s using is about 400 volts. When your particle comes in and strikes the nucleus of the gas inside, it temporarily ionizes that gas, just enough to allow some of that voltage through that it can be measured.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">He&rsquo;ll need a high voltage source to feed his tube.&nbsp; The cathode of the tube will run into an Arduino.&nbsp; Running the high voltage source through batteries will require a transformer.&nbsp; The transformer will require an AC current.&nbsp; The easiest way to create an AC current would be to create a little oscillator with 555 timers and run that into an inductor.&nbsp; The 555 timer will set up in astable mode to produce an alternating signal at 60 Hz that will get amplified by a MOSFET before running into the transformer. The current from the transformer will go into a diode laddering system which will drive the GM tube.&nbsp; The signal from the Geiger tube will run into an NPN transistor.&nbsp; The output pulse of the tube is around 200V, so it needs to have some level of conditioning before it can be counted by the Arduino. Once the output is run into ground they&rsquo;ll have a digital signal that they can feed back into the Arduino.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">He tests the circuit in a breadboard to make sure it works.&nbsp; The output of the Geiger tube is hooked into an oscilloscope.&nbsp; Matt uses an old aircraft instrument, an ADF with a glow in-the-dark radium dial to test to ensure that a signal is outputted to the scope.&nbsp; Now that we know the signal is working, we can condition that signal to create a digital pulse that we can measure and count with the Arduino.&nbsp; The tube output runs through a voltage divider so that it doesn&rsquo;t fry the transistor.&nbsp; All that&rsquo;s left is to 3D print some parts and do some coding using the Arduino IDE.</p> <div style="background:#ffffff;border:1px solid #dadada;margin:0;padding:14px 16px 16px 18px;vertical-align:top;"> <div style="display:inline-block;float:left;padding:0px 25px 8px 0px;"><a href="/challengesprojects/element14-presents/"><img alt="image" src="/e14/assets/legacy/2018/e14PresentsJune818.png" width="180px" /></a></div> <div style="display:inline-block;vertical-align:top;width:70%;"><br /> <p style="margin:0;"><span><a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/">element14 presents</a></span>&nbsp; <strong>|</strong>&nbsp; <span style="padding-right:5px;"><a class="jive-link-wiki-small" href="/challenges-projects/element14-presents/vcp-program/w/documents/3718/vcp-biography-airbornesurfer---matt-eargle">About Matt</a>&nbsp;</span><strong>|</strong>&nbsp; <a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/project-videos/">Project Videos</a></p> </div> </div><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: mosfet, radiation detector, geiger tube, e14presents_airbornesurfer, voltage divider, oscillator, circuit, arduino ide, ac current, gm tube, 555 timer, breadboard, cathode tube, matt eargle, cdv-700 series, npn transistor, vcp, arduino, diode laddering system, friday_release, inductor</div> Episode 352: Pripyat - DIY Geiger Counterhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352/revision/2Fri, 25 Mar 2022 08:59:56 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:79125911-6d48-4337-bebc-87364f399a47Matthttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352#commentsRevision 2 posted to Documents by Matt on 3/25/2022 8:59:56 AM<br /> <div style="background:#ffffff;padding:14px 16px 16px 18px;margin:0;vertical-align:top;border:1px solid #dadada;"><div style="float:left;display:inline-block;padding:0px 25px 8px 0px;"><a href="/challengesprojects/element14-presents/"><img alt="image" src="/e14/assets/legacy/2018/e14PresentsJune818.png" width="180px" /></a></div><div style="display:inline-block;vertical-align:top;width:70%;"><span style="font-size:18px;font-weight:bold;">Pripyat - DIY Geiger Counter</span><p style="margin:0;"><span><a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/">element14 Presents</a></span>&nbsp; <strong>|</strong>&nbsp; <span style="padding-right:5px;"><a class="jive-link-wiki-small" href="/challenges-projects/element14-presents/vcp-program/w/documents/3718/vcp-biography-airbornesurfer---matt-eargle">AirborneSurfer&#39;s VCP Profile</a> </span> <strong>|</strong>&nbsp; <a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/project-videos/">Project Videos</a> </p></div></div><p style="margin:0;padding:0px;">&nbsp;</p><table style="width:80%;display:block;margin:0 auto;"><tbody><tr><td style="padding-bottom:12px;"><span><a href="https://www.youtube.com/watch?v=wq8IOTKP8wQ">www.youtube.com/watch</a></span></td></tr><tr><td><p style="margin:0;border:1px solid #b8d7e5;background-color:#e9f6fc;padding:8px;max-width:634px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">Matthew goes atomic punk in this video where he takes some old Soviet surplus Geiger-Muller tubes and builds his own recreation of a Civil Defense-style Geiger counter. The CDV-700 series survey meters were developed in coordination with the US government at the height of the Cold War for deployment to local Civil Defense authorities. With a few off-the-shelf parts, Matthew builds a high-voltage circuit to power the GM tube and uses an Arduino Nano to process the output signal, driving the characteristic click and dancing analog meter, then encloses it in a custom 3D-printed case completing the homage to this mid-20th century piece of vintage tech!</span></p></td></tr></tbody></table><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;padding:0px;">&nbsp;</p><table border="1" class="jiveBorder" style="border:1px solid #000000;width:100%;"><thead><tr><th style="border:1px solid black;border:1px solid #000000;padding:2px;color:#ffffff;background-color:#6690bc;text-align:left;" valign="middle"><strong>Product Name</strong></th><th style="border:1px solid black;border:1px solid #000000;padding:2px;color:#ffffff;background-color:#6690bc;text-align:left;" valign="middle"><strong>Quantity<br /></strong></th><th style="border:1px solid black;border:1px solid #000000;padding:2px;color:#ffffff;background-color:#6690bc;text-align:left;" valign="middle"><span><a id="e14-product-link-d7627" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130&nsku=44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_BUY_KIT" class="e14-embedded e14_shopping-cart-far e14-button" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('d7627'));" data-farnell="31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130" data-newark="44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Kit</a> </span></th></tr></thead><tbody><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>Perfboard</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-d5b00" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=44W3453&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('d5b00'));" data-farnell="NULL" data-newark="44W3453" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>110V to 6V center-tap transformer</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-bb2e8" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=93K6544&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('bb2e8'));" data-farnell="NULL" data-newark="93K6544" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>555 timer and socket</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-1f990" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('1f990'));" data-farnell="" data-newark="31AC3583" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>0.1uF 50V electrolytic capacitor</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-4b927" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=65R3169&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('4b927'));" data-farnell="NULL" data-newark="65R3169" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>0.01uF 700VAC film capacitor</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-f9578" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('f9578'));" data-farnell="" data-newark="78Y8315" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>1N4007 diode</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-fce2a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1531923,1531923&nsku=83K4250&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_BUY_KIT" class="e14-embedded e14_shopping-cart-far e14-button" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('fce2a'));" data-farnell="1531923,1531923" data-newark="83K4250" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>0.01 uF 1kV ceramic disc capacitor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">3</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-beaf9" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1650710&nsku=80K9098&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('beaf9'));" data-farnell="1650710" data-newark="80K9098" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>4.7k resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">4</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-44273" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('44273'));" data-farnell="" data-newark="90Y9876" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>12k resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-a4516" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('a4516'));" data-farnell="" data-newark="90Y9734" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>100k resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-bceb0" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1700931&nsku=17M3627&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('bceb0'));" data-farnell="1700931" data-newark="17M3627" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>BUZ71 MOSFET</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-dab8e" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=19K8195&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('dab8e'));" data-farnell="NULL" data-newark="19K8195" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>2-pin screw-on connector set</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-cc213" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=94F8825&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('cc213'));" data-farnell="NULL" data-newark="94F8825" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>SbM-20U Geiger-Muller tube (any tube will do, but you&#39;ll have to adjust for different input/output voltages)</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>1M resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-29df0" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1170595&nsku=24M1010&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('29df0'));" data-farnell="1170595" data-newark="24M1010" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>330 resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-dcbb6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=58K5042&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('dcbb6'));" data-farnell="NULL" data-newark="58K5042" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong><span><span><a id="e14-product-link-2653a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=9206884&nsku=38M2076&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('2653a'));" data-farnell="9206884" data-newark="38M2076" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >2N2222</a> </span>BJT </span></strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-f0d80" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('f0d80'));" data-farnell="" data-newark="87K2254" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>Arduino Nano</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-b9567" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1848691&nsku=13T9275&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('b9567'));" data-farnell="1848691" data-newark="13T9275" data-comoverride="" data-cmpoverride="" data-cpc="SC09659" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>Piezo buzzer</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-e2393" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1022397&nsku=96K6086&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('e2393'));" data-farnell="1022397" data-newark="96K6086" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>5V moving magnet analog panel mount meter</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-99771" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('99771'));" data-farnell="" data-newark="14J8249" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>SPST panel mount toggle switch</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ed74f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=24C0562&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ed74f'));" data-farnell="NULL" data-newark="24C0562" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>LED</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-89fae" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=24C0562&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('89fae'));" data-farnell="NULL" data-newark="24C0562" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>Adafruit PowerBoost 1000</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-31776" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=NULL&nsku=40T9945&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('31776'));" data-farnell="NULL" data-newark="40T9945" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>LiPo battery</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-e7bab" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('e7bab'));" data-farnell="" data-newark="26Y8529" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>Wire</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ba04f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ba04f'));" data-farnell="" data-newark="91T1630" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>Solder</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-ec49c" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=9887130&nsku=93K2260&COM=e14c-noscript&CMP=e14c-noscript&osetc=e14-noscript-tracking-loss" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('ec49c'));" data-farnell="9887130" data-newark="93K2260" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>3D Printer Filament</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><a id="e14-product-link-25da7" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="javascript:void(0)" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('25da7'));" data-farnell="" data-newark="44AC4181" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></td></tr></tbody></table><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">Matt Eargle is a cold war nut who loves historical technologies. He just happens to have some old Soviet surplus Geiger tube sitting around.&nbsp;&nbsp; He’ll use it to build his own take on a Geiger counter.&nbsp; It will be something like an updated CDV 700 series. The original CDV-700 Series models were in production from 1954 until 1974.&nbsp; Later XXX series models were produced well into the 1980s. In order to build a homebrew version of a Geiger counter, he’ll need a couple of components in addition to his Geiger tube.&nbsp; A Geiger tube has a sealed vial inside a sealed glass tube containing an inert gas. You take that and apply a really high potential, the one he’s using is about 400 volts. When your particle comes in and strikes the nucleus of the gas inside, it temporarily ionizes that gas, just enough to allow some of that voltage through that it can be measured.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">He’ll need a high voltage source to feed his tube.&nbsp; The cathode of the tube will run into an Arduino.&nbsp; Running the high voltage source through batteries will require a transformer.&nbsp; The transformer will require an AC current.&nbsp; The easiest way to create an AC current would be to create a little oscillator with 555 timers and run that into an inductor.&nbsp; The 555 timer will set up in astable mode to produce an alternating signal at 60 Hz that will get amplified by a MOSFET before running into the transformer. The current from the transformer will go into a diode laddering system which will drive the GM tube.&nbsp; The signal from the Geiger tube will run into an NPN transistor.&nbsp; The output pulse of the tube is around 200V, so it needs to have some level of conditioning before it can be counted by the Arduino. Once the output is run into ground they’ll have a digital signal that they can feed back into the Arduino.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">He tests the circuit in a breadboard to make sure it works.&nbsp; The output of the Geiger tube is hooked into an oscilloscope.&nbsp; Matt uses an old aircraft instrument, an ADF with a glow in-the-dark radium dial to test to ensure that a signal is outputted to the scope.&nbsp; Now that we know the signal is working, we can condition that signal to create a digital pulse that we can measure and count with the Arduino.&nbsp; The tube output runs through a voltage divider so that it doesn’t fry the transistor.&nbsp; All that’s left is to 3D print some parts and do some coding using the Arduino IDE.</p><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: mosfet, radiation detector, geiger tube, e14presents_airbornesurfer, voltage divider, oscillator, circuit, arduino ide, ac current, gm tube, 555 timer, breadboard, cathode tube, matt eargle, cdv-700 series, npn transistor, vcp, arduino, diode laddering system, friday_release, inductor</div> Episode 352: Pripyat - DIY Geiger Counterhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352/revision/1Fri, 07 Dec 2018 00:41:31 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:79125911-6d48-4337-bebc-87364f399a47tariq.ahmadhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/3784/pripyat---diy-geiger-counter----episode-352#commentsRevision 1 posted to Documents by tariq.ahmad on 12/7/2018 12:41:31 AM<br /> <div style="background:#ffffff;padding:14px 16px 16px 18px;margin:0;vertical-align:top;border:1px solid #dadada;"><div style="float:left;display:inline-block;padding:0px 25px 8px 0px;"><a href="/challengesprojects/element14-presents/"><img alt="image" src="/e14/assets/legacy/2018/e14PresentsJune818.png" width="180px" /></a></div><div style="display:inline-block;vertical-align:top;width:70%;"><span style="font-size:18px;font-weight:bold;">Pripyat - DIY Geiger Counter</span><p style="margin:0;"><span><a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/">element14 Presents</a></span>&nbsp; <strong>|</strong>&nbsp; <span style="padding-right:5px;"><a class="jive-link-wiki-small" href="/challenges-projects/element14-presents/vcp-program/w/documents/3718/vcp-biography-airbornesurfer---matt-eargle">AirborneSurfer&#39;s VCP Profile</a> </span> <strong>|</strong>&nbsp; <a class="jivecontainerTT-hover-container jive-link-community-small" href="/challengesprojects/element14-presents/project-videos/">Project Videos</a> </p></div></div><p style="margin:0;padding:0px;">&nbsp;</p><table style="width:80%;display:block;margin:0 auto;"><tbody><tr><td style="padding-bottom:12px;"><span><a href="https://www.youtube.com/watch?v=wq8IOTKP8wQ">www.youtube.com/watch</a></span></td></tr><tr><td><p style="margin:0;border:1px solid #b8d7e5;background-color:#e9f6fc;padding:8px;max-width:634px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">Matthew goes atomic punk in this video where he takes some old Soviet surplus Geiger-Muller tubes and builds his own recreation of a Civil Defense-style Geiger counter. The CDV-700 series survey meters were developed in coordination with the US government at the height of the Cold War for deployment to local Civil Defense authorities. With a few off-the-shelf parts, Matthew builds a high-voltage circuit to power the GM tube and uses an Arduino Nano to process the output signal, driving the characteristic click and dancing analog meter, then encloses it in a custom 3D-printed case completing the homage to this mid-20th century piece of vintage tech!</span></p></td></tr></tbody></table><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;padding:0px;">&nbsp;</p><table border="1" class="jiveBorder" style="border:1px solid #000000;width:100%;"><thead><tr><th style="border:1px solid black;border:1px solid #000000;padding:2px;color:#ffffff;background-color:#6690bc;text-align:left;" valign="middle"><strong>Product Name</strong></th><th style="border:1px solid black;border:1px solid #000000;padding:2px;color:#ffffff;background-color:#6690bc;text-align:left;" valign="middle"><strong>Quantity<br /></strong></th><th style="border:1px solid black;border:1px solid #000000;padding:2px;color:#ffffff;background-color:#6690bc;text-align:left;" valign="middle"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-ACKvLSL5-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130&amp;nsku=44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=31AC3583,1650710,1700931,1170595,9206884,1848691,1022397,9887130&amp;nsku=44W3453,93K6544,31AC3583,65R3169,78Y8315,83K4250,80K9098,90Y9876,90Y9734,17M3627,19K8195,94F8825&amp;COM=noscript" target="_blank">Buy Kit</a></span><span class="e14-init-hidden" id="addProduct-ACKvLSL5-unlinked">Buy Kit</span></span></th></tr></thead><tbody><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>Perfboard</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-acLc2UoS-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=44W3453&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=44W3453&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-acLc2UoS-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>110V to 6V center-tap transformer</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-9S3Qg09G-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=93K6544&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=93K6544&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-9S3Qg09G-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>555 timer and socket</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-hFmAaZ9T-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=31AC3583&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=31AC3583&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-hFmAaZ9T-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>0.1uF 50V electrolytic capacitor</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-TNfPgpWF-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=65R3169&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=65R3169&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-TNfPgpWF-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>0.01uF 700VAC film capacitor</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-J0CjKVn2-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=78Y8315&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=78Y8315&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-J0CjKVn2-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>1N4007 diode</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-L0RiDiTk-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=1531923,1531923&amp;nsku=83K4250&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=1531923,1531923&amp;nsku=83K4250&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-L0RiDiTk-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>0.01 uF 1kV ceramic disc capacitor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">3</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-ctG2tzIa-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=1650710&amp;nsku=80K9098&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=1650710&amp;nsku=80K9098&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-ctG2tzIa-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>4.7k resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">4</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-rWyUWrUs-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=90Y9876&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=90Y9876&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-rWyUWrUs-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>12k resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-cEq1GBuw-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=90Y9734&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=90Y9734&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-cEq1GBuw-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>100k resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-ArIqofgP-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=1700931&amp;nsku=17M3627&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=1700931&amp;nsku=17M3627&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-ArIqofgP-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>BUZ71 MOSFET</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-CKpGHEVz-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=19K8195&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=19K8195&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-CKpGHEVz-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>2-pin screw-on connector set</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-mPEsMOm3-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=94F8825&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=94F8825&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-mPEsMOm3-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>SbM-20U Geiger-Muller tube (any tube will do, but you&#39;ll have to adjust for different input/output voltages)</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>1M resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-06z5bWl3-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=1170595&amp;nsku=24M1010&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=1170595&amp;nsku=24M1010&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-06z5bWl3-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>330 resistor</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-XJdjyYKO-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=58K5042&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=58K5042&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-XJdjyYKO-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong><span><span><span class="e14-init-shown" id="addProduct-n1nPPOQY-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=9206884&amp;nsku=38M2076&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=9206884&amp;nsku=38M2076&amp;COM=noscript" target="_blank">2N2222</a></span><span class="e14-init-hidden" id="addProduct-n1nPPOQY-unlinked">2N2222</span></span>BJT </span></strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-CpPPKfSr-linked" style="white-space:nowrap;"><a 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target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=1022397&amp;nsku=96K6086&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-cphNEpc8-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>5V moving magnet analog panel mount meter</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-xeNTPzmI-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=14J8249&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=14J8249&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-xeNTPzmI-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>SPST panel mount toggle switch</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-qaWXScCt-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=24C0562&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=24C0562&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-qaWXScCt-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>LED</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-NyfVw2eo-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=24C0562&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=24C0562&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-NyfVw2eo-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>Adafruit PowerBoost 1000</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-8DPhnZXw-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=40T9945&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=NULL&amp;nsku=40T9945&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-8DPhnZXw-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>LiPo battery</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-tXnl0pJb-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=26Y8529&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=26Y8529&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-tXnl0pJb-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><p style="margin:0;"><strong>Wire</strong></p></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-M4oKTg5D-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=91T1630&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=91T1630&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-M4oKTg5D-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>Solder</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-KgeJuher-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=9887130&amp;nsku=93K2260&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=9887130&amp;nsku=93K2260&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-KgeJuher-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><strong>3D Printer Filament</strong></td><td style="border:1px solid black;border:1px solid #000000;padding:2px;">1</td><td style="border:1px solid black;border:1px solid #000000;padding:2px;"><span><span class="e14-init-shown" id="addProduct-QRaiORxg-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=44AC4181&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=&amp;nsku=44AC4181&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-QRaiORxg-unlinked">Buy Now</span></span></td></tr></tbody></table><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">Matt Eargle is a cold war nut who loves historical technologies. He just happens to have some old Soviet surplus Geiger tube sitting around.&nbsp;&nbsp; He’ll use it to build his own take on a Geiger counter.&nbsp; It will be something like an updated CDV 700 series. The original CDV-700 Series models were in production from 1954 until 1974.&nbsp; Later XXX series models were produced well into the 1980s. In order to build a homebrew version of a Geiger counter, he’ll need a couple of components in addition to his Geiger tube.&nbsp; A Geiger tube has a sealed vial inside a sealed glass tube containing an inert gas. You take that and apply a really high potential, the one he’s using is about 400 volts. When your particle comes in and strikes the nucleus of the gas inside, it temporarily ionizes that gas, just enough to allow some of that voltage through that it can be measured.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">He’ll need a high voltage source to feed his tube.&nbsp; The cathode of the tube will run into an Arduino.&nbsp; Running the high voltage source through batteries will require a transformer.&nbsp; The transformer will require an AC current.&nbsp; The easiest way to create an AC current would be to create a little oscillator with 555 timers and run that into an inductor.&nbsp; The 555 timer will set up in astable mode to produce an alternating signal at 60 Hz that will get amplified by a MOSFET before running into the transformer. The current from the transformer will go into a diode laddering system which will drive the GM tube.&nbsp; The signal from the Geiger tube will run into an NPN transistor.&nbsp; The output pulse of the tube is around 200V, so it needs to have some level of conditioning before it can be counted by the Arduino. Once the output is run into ground they’ll have a digital signal that they can feed back into the Arduino.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">He tests the circuit in a breadboard to make sure it works.&nbsp; The output of the Geiger tube is hooked into an oscilloscope.&nbsp; Matt uses an old aircraft instrument, an ADF with a glow in-the-dark radium dial to test to ensure that a signal is outputted to the scope.&nbsp; Now that we know the signal is working, we can condition that signal to create a digital pulse that we can measure and count with the Arduino.&nbsp; The tube output runs through a voltage divider so that it doesn’t fry the transistor.&nbsp; All that’s left is to 3D print some parts and do some coding using the Arduino IDE.</p><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: mosfet, radiation detector, geiger tube, e14presents_airbornesurfer, voltage divider, oscillator, circuit, arduino ide, ac current, gm tube, 555 timer, breadboard, cathode tube, matt eargle, cdv-700 series, npn transistor, vcp, arduino, diode laddering system, friday_release, inductor</div>