/members-area/personalblogs/b/john-wiltrout-s-blog/posts/fun-with-an-old-x-ray-display-boardOne of the things that I enjoy doing is taking an old unused circuit board and reverse engineering it to see how it works. Today I have a time display board from a Dental X-Ray machine that my son gave me. The typical old dental x-ray machine dispensen-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/fun-with-an-old-x-ray-display-boardWed, 29 Apr 2015 17:38:16 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:381a275f-5962-44b0-b36c-cea479e8bdd4DAB1<p>Nice blog John,</p><p>&nbsp;</p><p>It is nice seeing components from my older days seeing the light and still working.</p><p>&nbsp;</p><p>Well done.</p><p>&nbsp;</p><p>DAB</p><img src="https://community.element14.com/aggbug?PostID=20633&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/fun-with-an-old-x-ray-display-boardWed, 29 Apr 2015 10:39:57 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:381a275f-5962-44b0-b36c-cea479e8bdd4shabaz1<p>Hi John,</p><p>&nbsp;</p><p>Thanks for the enjoyable blog post! It was a very interesting read, and very cool that you got an extra digit for mV measurement and could be trimmed for accuracy!!</p><p>I&#39;m wondering if the flip flops are used to switch an analog voltage to the yellow capacitor (i.e. like some sort of integrator for all the bursts of radiation), since the two transistors on their sides could perhaps be doing some analog switching. Are they FETs from the part number perhaps?</p><img src="https://community.element14.com/aggbug?PostID=20633&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">