/members-area/personalblogs/b/john-wiltrout-s-blog/posts/process-duration-timer-part-2-power-supplyBefore I show you the power supply module for this project I thought I would share the basic block diagram of the different modules and how the power and control lines will interconnect. As any of the experienced builders on e14 will tell ...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/process-duration-timer-part-2-power-supplyFri, 28 Jul 2017 20:12:30 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e20fb64c-f6ce-4572-aeff-df973542e362DAB1<p>Nice update John.</p><p>&nbsp;</p><p>The power supply board looks well made.</p><p>&nbsp;</p><p>I suspect that you will find the 10 turn POT tedious to adjust.</p><p>&nbsp;</p><p>Unless you are looking for millivolt precision, I would go with a standard POT.</p><p>&nbsp;</p><p>It will be faster to adjust and you probably will not need better precision.</p><p>&nbsp;</p><p>DAB</p><img src="https://community.element14.com/aggbug?PostID=3359&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/process-duration-timer-part-2-power-supplyFri, 28 Jul 2017 09:04:19 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e20fb64c-f6ce-4572-aeff-df973542e362mcb10<blockquote class="jive-quote"><span>and with an additional buck to 5 volts to drive the suspension relay of the clock module.</span></blockquote><p><span>John are you meaning the 5v is required for the relay coil.??</span></p><p>&nbsp;</p><p><span>If I recall most (not all) 5v regulators on Arduino boards can deliver 150mA, which may save you needing a 9-5v regulator.</span></p><p>&nbsp;</p><p><span>Mark</span></p><img src="https://community.element14.com/aggbug?PostID=3359&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">