/members-area/personalblogs/b/blog/posts/yaps-part-four---design---calculations-iEDITS: 11/6/19 - Fixed broken links As part of the analysis I was doing into the design and selection of parts, I ran up some calculations. I also validated the thermal characteristics of the key parts to see how likely they were to need h...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/yaps-part-four---design---calculations-iSun, 09 Jun 2019 18:06:34 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:636ec4dc-2934-47e8-80da-f0c981e5d9efAndrew J0<p>I&#39;ve made an update to the calculations.&nbsp; The current draw on the LM7805 is much greater than originally thought because I hadn&#39;t taken account of the Arduino (4Duino) used to interface with the supply.&nbsp; This would require a large heatsink so, following excellent advice from Shabaz, I have changed the part to a DC-DC Switching Regulator.&nbsp; The new spreadsheet still includes the LM7805 so it&#39;s possible to see why it has been rejected.&nbsp; The Switching Regulator won&#39;t have any heat issues.</p><img src="https://community.element14.com/aggbug?PostID=7175&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">