https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509en-USTelligent Community 12https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509Fri, 30 Jul 2021 07:24:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852Matthttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsCurrent Revision posted to Documents by Matt on 7/30/2021 7:24:00 AM<br /> <p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span></p> <p style="margin:0;"></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:744px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf10"><span style="color:#3334ca;">Bill of Material:</span></h2> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Quantity</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"><a id="e14-product-link-a276f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530&nsku=89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742&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('a276f'));" data-farnell="1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530" data-newark="89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td> <td style="border:1px solid #C6C6C6;padding:6px;">ABRACON</td> <td style="border:1px solid #C6C6C6;padding:6px;">1862377</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-0faca" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1862377&nsku=89K0457&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('0faca'));" data-farnell="1862377" data-newark="89K0457" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td> <td style="border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td> <td style="border:1px solid #C6C6C6;padding:6px;">1168637</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-29bcf" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1168637&nsku=26M2808&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('29bcf'));" data-farnell="1168637" data-newark="26M2808" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119758</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-90020" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119758&nsku=33AH3809&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('90020'));" data-farnell="3119758" data-newark="33AH3809" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006469</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-c4c2d" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006469&nsku=29AH7689&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('c4c2d'));" data-farnell="3006469" data-newark="29AH7689" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119855</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-3f889" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119855&nsku=CD4511BE&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('3f889'));" data-farnell="3119855" data-newark="CD4511BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006272</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-fe9a9" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006272&nsku=CD4029BE&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('fe9a9'));" data-farnell="3006272" data-newark="CD4029BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119947</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-cf821" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119947&nsku=33AH3787&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('cf821'));" data-farnell="3119947" data-newark="33AH3787" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3120530</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-c443a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3120530&nsku=64AH8742&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('c443a'));" data-farnell="3120530" data-newark="64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf11"><span style="color:#3334ca;">Additional Parts:</span></h2> <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> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;">9V 3A DC power supply</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Soldering station</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Breadboard</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">LED indicators</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">resistors</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">push button</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">2-way switch</td> </tr> </tbody> </table> <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%;"><span style="font-size:18px;font-weight:bold;">DIY Discrete Logic LED Countdown Timer</span> <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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika" data-e14adj="t">About Surbhika</a>&nbsp;<span style="padding-right:5px;"></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: cd4060be, countdown timer, 7 segment display, abracon, e14presents_subhika, led, element14 presents, logic ic, kingbright, e14p_SR, discrete components, surbhika, friday_release</div> https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509/revision/6Thu, 07 Jul 2022 21:14:32 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852saradetwilerhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsRevision 6 posted to Documents by saradetwiler on 7/7/2022 9:14:32 PM<br /> <p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span></p> <p style="margin:0;"></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:744px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf10"><span style="color:#3334ca;">Bill of Material:</span></h2> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Quantity</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"><a id="e14-product-link-926b4" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530&nsku=89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742&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('926b4'));" data-farnell="1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530" data-newark="89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td> <td style="border:1px solid #C6C6C6;padding:6px;">ABRACON</td> <td style="border:1px solid #C6C6C6;padding:6px;">1862377</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-76b0f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1862377&nsku=89K0457&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('76b0f'));" data-farnell="1862377" data-newark="89K0457" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td> <td style="border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td> <td style="border:1px solid #C6C6C6;padding:6px;">1168637</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-8522e" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1168637&nsku=26M2808&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('8522e'));" data-farnell="1168637" data-newark="26M2808" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119758</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-2fbf5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119758&nsku=33AH3809&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('2fbf5'));" data-farnell="3119758" data-newark="33AH3809" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006469</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-f38f4" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006469&nsku=29AH7689&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('f38f4'));" data-farnell="3006469" data-newark="29AH7689" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119855</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-5709a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119855&nsku=CD4511BE&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('5709a'));" data-farnell="3119855" data-newark="CD4511BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006272</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-af032" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006272&nsku=CD4029BE&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('af032'));" data-farnell="3006272" data-newark="CD4029BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119947</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-792b5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119947&nsku=33AH3787&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('792b5'));" data-farnell="3119947" data-newark="33AH3787" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3120530</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-2cd72" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3120530&nsku=64AH8742&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('2cd72'));" data-farnell="3120530" data-newark="64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf11"><span style="color:#3334ca;">Additional Parts:</span></h2> <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> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;">9V 3A DC power supply</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Soldering station</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Breadboard</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">LED indicators</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">resistors</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">push button</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">2-way switch</td> </tr> </tbody> </table> <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%;"><span style="font-size:18px;font-weight:bold;">DIY Discrete Logic LED Countdown Timer</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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika">About Surbhika</a>&nbsp;<span style="padding-right:5px;"></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: cd4060be, countdown timer, 7 segment display, abracon, e14presents_subhika, led, element14 presents, logic ic, kingbright, e14p_SR, discrete components, surbhika, friday_release</div> https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509/revision/5Wed, 23 Feb 2022 23:25:18 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852kellyhensenhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsRevision 5 posted to Documents by kellyhensen on 2/23/2022 11:25:18 PM<br /> <p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span></p> <p style="margin:0;"></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:744px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf10"><span style="color:#3334ca;">Bill of Material:</span></h2> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Quantity</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"><a id="e14-product-link-fcdd5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530&nsku=89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742&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('fcdd5'));" data-farnell="1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530" data-newark="89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td> <td style="border:1px solid #C6C6C6;padding:6px;">ABRACON</td> <td style="border:1px solid #C6C6C6;padding:6px;">1862377</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-338f7" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1862377&nsku=89K0457&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('338f7'));" data-farnell="1862377" data-newark="89K0457" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td> <td style="border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td> <td style="border:1px solid #C6C6C6;padding:6px;">1168637</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-654c5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1168637&nsku=26M2808&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('654c5'));" data-farnell="1168637" data-newark="26M2808" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119758</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-639fd" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119758&nsku=33AH3809&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('639fd'));" data-farnell="3119758" data-newark="33AH3809" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006469</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-332d3" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006469&nsku=29AH7689&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('332d3'));" data-farnell="3006469" data-newark="29AH7689" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119855</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-6dd06" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119855&nsku=CD4511BE&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('6dd06'));" data-farnell="3119855" data-newark="CD4511BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006272</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-61366" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006272&nsku=CD4029BE&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('61366'));" data-farnell="3006272" data-newark="CD4029BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119947</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-0b4e4" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119947&nsku=33AH3787&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('0b4e4'));" data-farnell="3119947" data-newark="33AH3787" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3120530</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-03f45" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3120530&nsku=64AH8742&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('03f45'));" data-farnell="3120530" data-newark="64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf11"><span style="color:#3334ca;">Additional Parts:</span></h2> <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> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;">9V 3A DC power supply</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Soldering station</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Breadboard</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">LED indicators</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">resistors</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">push button</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">2-way switch</td> </tr> </tbody> </table> <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%;"><span style="font-size:18px;font-weight:bold;">DIY Discrete Logic LED Countdown Timer</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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika">About Surbhika</a>&nbsp;<span style="padding-right:5px;"></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: cd4060be, countdown timer, 7 segment display, abracon, e14presents_subhika, led, element14 presents, logic ic, kingbright, discrete components, surbhika, friday_release</div> https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509/revision/4Wed, 23 Feb 2022 23:13:05 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852kellyhensenhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsRevision 4 posted to Documents by kellyhensen on 2/23/2022 11:13:05 PM<br /> <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%;"><span style="font-size:18px;font-weight:bold;">DIY Discrete Logic LED Countdown Timer</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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika">Surbhika&#39;s VCP Profile</a> <span style="padding-right:5px;"> </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> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"></p> <p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span></p> <p style="margin:0;"></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:744px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf10"><span style="color:#3334ca;">Bill of Material:</span></h2> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Quantity</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"><a id="e14-product-link-b94f1" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530&nsku=89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742&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('b94f1'));" data-farnell="1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530" data-newark="89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td> <td style="border:1px solid #C6C6C6;padding:6px;">ABRACON</td> <td style="border:1px solid #C6C6C6;padding:6px;">1862377</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-a421c" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1862377&nsku=89K0457&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('a421c'));" data-farnell="1862377" data-newark="89K0457" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td> <td style="border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td> <td style="border:1px solid #C6C6C6;padding:6px;">1168637</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-55856" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1168637&nsku=26M2808&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('55856'));" data-farnell="1168637" data-newark="26M2808" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119758</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-5720a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119758&nsku=33AH3809&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('5720a'));" data-farnell="3119758" data-newark="33AH3809" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006469</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-3b399" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006469&nsku=29AH7689&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('3b399'));" data-farnell="3006469" data-newark="29AH7689" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119855</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-6cab7" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119855&nsku=CD4511BE&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('6cab7'));" data-farnell="3119855" data-newark="CD4511BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006272</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-8dbe0" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006272&nsku=CD4029BE&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('8dbe0'));" data-farnell="3006272" data-newark="CD4029BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119947</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-0fba1" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119947&nsku=33AH3787&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('0fba1'));" data-farnell="3119947" data-newark="33AH3787" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3120530</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-e49f6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3120530&nsku=64AH8742&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('e49f6'));" data-farnell="3120530" data-newark="64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf11"><span style="color:#3334ca;">Additional Parts:</span></h2> <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> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;">9V 3A DC power supply</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Soldering station</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Breadboard</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">LED indicators</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">resistors</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">push button</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">2-way switch</td> </tr> </tbody> </table><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: cd4060be, countdown timer, 7 segment display, abracon, e14presents_subhika, led, element14 presents, logic ic, kingbright, discrete components, surbhika, friday_release</div> https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509/revision/3Tue, 30 Nov 2021 03:55:14 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852dychenhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsRevision 3 posted to Documents by dychen on 11/30/2021 3:55:14 AM<br /> <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%;"><span style="font-size:18px;font-weight:bold;">DIY Discrete Logic LED Countdown Timer</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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika">Surbhika&#39;s VCP Profile</a> <span style="padding-right:5px;"> </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> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"></p> <p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span></p> <p style="margin:0;"></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:744px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf10"><span style="color:#3334ca;">Bill of Material:</span></h2> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Quantity</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"><a id="e14-product-link-af39a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="button" href="https://referral.element14.com/OrderCodeView?fsku=1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530&nsku=89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742&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('af39a'));" data-farnell="1862377,1168637,3119758,3006469,3119855,3006272,3119947,3120530" data-newark="89K0457,26M2808,33AH3809,29AH7689,CD4511BE,CD4029BE,33AH3787,64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td> <td style="border:1px solid #C6C6C6;padding:6px;">ABRACON</td> <td style="border:1px solid #C6C6C6;padding:6px;">1862377</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-2e75e" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1862377&nsku=89K0457&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('2e75e'));" data-farnell="1862377" data-newark="89K0457" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td> <td style="border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td> <td style="border:1px solid #C6C6C6;padding:6px;">1168637</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-56876" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1168637&nsku=26M2808&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('56876'));" data-farnell="1168637" data-newark="26M2808" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119758</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-c80e1" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119758&nsku=33AH3809&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('c80e1'));" data-farnell="3119758" data-newark="33AH3809" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006469</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-fdb95" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006469&nsku=29AH7689&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('fdb95'));" data-farnell="3006469" data-newark="29AH7689" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119855</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-93c60" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119855&nsku=CD4511BE&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('93c60'));" data-farnell="3119855" data-newark="CD4511BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006272</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-7e805" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006272&nsku=CD4029BE&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('7e805'));" data-farnell="3006272" data-newark="CD4029BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119947</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-0f5c6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119947&nsku=33AH3787&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('0f5c6'));" data-farnell="3119947" data-newark="33AH3787" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3120530</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-a63b1" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3120530&nsku=64AH8742&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('a63b1'));" data-farnell="3120530" data-newark="64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf11"><span style="color:#3334ca;">Additional Parts:</span></h2> <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> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;">9V 3A DC power supply</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Soldering station</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Breadboard</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">LED indicators</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">resistors</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">push button</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">2-way switch</td> </tr> </tbody> </table><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: cd4060be, countdown timer, 7 segment display, e14presents_subhika, led, element14 presents, logic ic, discrete components, friday_release, e14presents_surbhika</div> https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509/revision/2Tue, 30 Nov 2021 03:50:04 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852dychenhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsRevision 2 posted to Documents by dychen on 11/30/2021 3:50:04 AM<br /> <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%;"><span style="font-size:18px;font-weight:bold;">DIY Discrete Logic LED Countdown Timer</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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika">Surbhika&#39;s VCP Profile</a> <span style="padding-right:5px;"> </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> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"></p> <p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span></p> <p style="margin:0;"></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="background-color:#e9f6fc;border:1px solid #b8d7e5;margin:0;max-width:744px;padding:8px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf10"><span style="color:#3334ca;">Bill of Material:</span></h2> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Quantity</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"><span><span id="addProduct-3zDheBlF-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=89K0457~1862377,26M2808~1168637,33AH3809~3119758,29AH7689~3006469,CD4511BE~3119855,CD4029BE~3006272,33AH3787~3119947,64AH8742~3120530&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=89K0457~1862377,26M2808~1168637,33AH3809~3119758,29AH7689~3006469,CD4511BE~3119855,CD4029BE~3006272,33AH3787~3119947,64AH8742~3120530&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Kit</a></span><span id="addProduct-3zDheBlF-unlinked" class="e14-init-hidden">Buy Kit</span></span></th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td> <td style="border:1px solid #C6C6C6;padding:6px;">ABRACON</td> <td style="border:1px solid #C6C6C6;padding:6px;">1862377</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-FKrqBPvJ-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=89K0457~1862377&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=89K0457~1862377&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a>Buy Now&nbsp;<a id="e14-product-link-02dc5" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1862377&nsku=89K0457&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('02dc5'));" data-farnell="1862377" data-newark="89K0457" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </span></span></td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td> <td style="border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td> <td style="border:1px solid #C6C6C6;padding:6px;">1168637</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-URGQUy0p-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=26M2808~1168637&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=26M2808~1168637&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-URGQUy0p-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-82b7b" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=1168637&nsku=26M2808&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('82b7b'));" data-farnell="1168637" data-newark="26M2808" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119758</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-2GG9xiRR-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=33AH3809~3119758&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=33AH3809~3119758&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-2GG9xiRR-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-cf69a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119758&nsku=33AH3809&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('cf69a'));" data-farnell="3119758" data-newark="33AH3809" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006469</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-VBozIaba-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=29AH7689~3006469&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=29AH7689~3006469&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-VBozIaba-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-09407" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006469&nsku=29AH7689&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('09407'));" data-farnell="3006469" data-newark="29AH7689" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119855</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-bBeFNlzc-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=CD4511BE~3119855&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=CD4511BE~3119855&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-bBeFNlzc-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-fa21c" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119855&nsku=CD4511BE&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('fa21c'));" data-farnell="3119855" data-newark="CD4511BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3006272</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-VPPBVtS8-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=CD4029BE~3006272&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=CD4029BE~3006272&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-VPPBVtS8-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-0fa2d" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3006272&nsku=CD4029BE&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('0fa2d'));" data-farnell="3006272" data-newark="CD4029BE" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3119947</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-0VJsQazj-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=33AH3787~3119947&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=33AH3787~3119947&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-0VJsQazj-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-f04df" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3119947&nsku=33AH3787&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('f04df'));" data-farnell="3119947" data-newark="33AH3787" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td> <td style="border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td> <td style="border:1px solid #C6C6C6;padding:6px;">3120530</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-6H0WLqmX-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=64AH8742~3120530&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" 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=64AH8742~3120530&amp;nsku=&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-6H0WLqmX-unlinked" class="e14-init-hidden">Buy Now</span></span><a id="e14-product-link-f5b2f" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3120530&nsku=64AH8742&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('f5b2f'));" data-farnell="3120530" data-newark="64AH8742" data-comoverride="" data-cmpoverride="" data-cpc="" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <p style="margin:0;padding:0px;">&nbsp;</p> <h2 id="mcetoc_1flnetaf11"><span style="color:#3334ca;">Additional Parts:</span></h2> <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> </tr> </thead> <tbody> <tr> <td style="border:1px solid #000000;padding:2px;">9V 3A DC power supply</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Soldering station</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">Breadboard</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">LED indicators</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">resistors</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">push button</td> </tr> <tr> <td style="border:1px solid #000000;padding:2px;">2-way switch</td> </tr> </tbody> </table><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: cd4060be, countdown timer, 7 segment display, e14presents_subhika, led, element14 presents, logic ic, discrete components, friday_release, e14presents_surbhika</div> https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509/revision/1Fri, 20 Aug 2021 13:53:25 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a95d34a-7f92-41eb-b101-e58cf0d92852tariq.ahmadhttps://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509#commentsRevision 1 posted to Documents by tariq.ahmad on 8/20/2021 1:53:25 PM<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;">DIY Discrete Logic LED Countdown Timer</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; <a class="jive-link-wiki-small" href="/challengesprojects/element14-presents/vcp-program/w/documents/5385/vcp-biography-surbhika">Surbhika&#39;s VCP Profile</a> <span style="padding-right:5px;"> </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><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"></p><span><a href="https://www.youtube.com/watch?v=7TXcq8sb-vc">www.youtube.com/watch</a></span><p style="margin:0;"></p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;border:1px solid #b8d7e5;background-color:#e9f6fc;padding:8px;max-width:744px;"><span style="color:#000000;font-family:&#39;Open Sans&#39;, Arial, sans-serif;text-align:justify;">This digital countdown timer displays remaining time set for a deadline/event. The USP of this project is that it is built without using any microcontroller unit. So, It is about going through a fair journey to hardcore digital electronics involving concepts of clock, counter, and digital logic design. </span></p><p style="margin:0;padding:0px;">&nbsp;</p><h2><span style="color:#3334ca;">Bill of Material:</span></h2><p style="margin:0;padding:0px;">&nbsp;</p><table border="1" class="jiveBorder mce-item-table" style="border:1px solid #C6C6C6;"><thead><tr><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;">Product Name</th><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;">Manufacturer</th><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;">Quantity</th><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-3zDheBlF-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=89K0457~1862377,26M2808~1168637,33AH3809~3119758,29AH7689~3006469,CD4511BE~3119855,CD4029BE~3006272,33AH3787~3119947,64AH8742~3120530&amp;nsku=&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=89K0457~1862377,26M2808~1168637,33AH3809~3119758,29AH7689~3006469,CD4511BE~3119855,CD4029BE~3006272,33AH3787~3119947,64AH8742~3120530&amp;nsku=&amp;COM=noscript" target="_blank">Buy Kit</a></span><span class="e14-init-hidden" id="addProduct-3zDheBlF-unlinked">Buy Kit</span></span></th></tr></thead><tbody><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">CRYSTAL, 32.768KHZ, 12.5PF, CYLINDER</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">ABRACON</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">1862377</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-FKrqBPvJ-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=89K0457~1862377&amp;nsku=&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=89K0457~1862377&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-FKrqBPvJ-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">7 Segment LED Display, Mechanically Rugged, Red, 20 mA, 8 V, 55.5 mcd, 1, 56.9 mm</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">KINGBRIGHT</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">1168637</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-URGQUy0p-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=26M2808~1168637&amp;nsku=&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=26M2808~1168637&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-URGQUy0p-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Ripple Carry Binary / Divider, CD4000 Family, 24 MHz, 3 V to 18 V, DIP-16</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">3119758</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-2GG9xiRR-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=33AH3809~3119758&amp;nsku=&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=33AH3809~3119758&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-2GG9xiRR-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Logic IC, OR Gate, Quad, 8 Inputs, 14 Pins, DIP, 7432</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">3006469</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-VBozIaba-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=29AH7689~3006469&amp;nsku=&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=29AH7689~3006469&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-VBozIaba-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">BCD to 7 Segment Decoder / Driver / Latch, 1 Gate, 4 Input, 7 Output, 6.8 mA, 3 V to 18 V, DIP-16</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">3119855</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-bBeFNlzc-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=CD4511BE~3119855&amp;nsku=&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=CD4511BE~3119855&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-bBeFNlzc-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Binary / BCD Up / Down Counter, 11 MHz, 3 V to 18 V, DIP-16</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">3006272</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-VPPBVtS8-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=CD4029BE~3006272&amp;nsku=&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=CD4029BE~3006272&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-VPPBVtS8-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Flip-Flop, Complementary Output, Positive Edge, CD4013, D, 45 ns, 12 MHz, 6.8 mA, DIP</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">3119947</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-0VJsQazj-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=33AH3787~3119947&amp;nsku=&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=33AH3787~3119947&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-0VJsQazj-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Logic IC, AND Gate, Triple, 3 Inputs, 14 Pins, DIP, 74LS11</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">TEXAS INSTRUMENTS</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">3120530</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-6H0WLqmX-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=64AH8742~3120530&amp;nsku=&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=64AH8742~3120530&amp;nsku=&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-6H0WLqmX-unlinked">Buy Now</span></span></td></tr></tbody></table><p style="margin:0;padding:0px;">&nbsp;</p><h2><span style="color:#3334ca;">Additional Parts:</span></h2><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></tr></thead><tbody><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">9V 3A DC power supply</td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">Soldering station</td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">Breadboard</td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">LED indicators</td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">resistors</td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">push button</td></tr><tr><td style="border:1px solid black;border:1px solid #000000;padding:2px;">2-way switch</td></tr></tbody></table><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: cd4060be, countdown timer, 7 segment display, e14presents_subhika, led, element14 presents, logic ic, discrete components, friday_release, e14presents_surbhika</div>