<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">The spec sheet says 83% efficient. It is a 25W supply so at most you will be dumping 5W.<div>The beauty of a switching supply is that you don't just dump the excess power like a linear supply.</div><div>But the quiescent losses will be there.</div><div><br><div>Regardless your challenge is to get rid of this heat. Even at a few watts. </div><div>A fan is a pretty good idea and 5V fans are plentiful. </div><div>The supply does not suited to mount a passive heat sink.</div><div><br></div><div>It is a nice looking supply. It would be shame to have it melt down. Or catch fire.</div><div>70C will feel very hot to touch (max rating). <br><div><br><div><div>On 2013-07-11, at 6:49 PM, Britta Evans-Fenton <<a href="mailto:technical@artengine.ca">technical@artengine.ca</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div>A little question about AC adapters. </div><div><br></div><div>I have an artwork that I did that I used an AC adapter to get power. It was on for 4 days during a show, and I was surprised on how hot it got. (I almost burned myself). I did have duct tape on it holding it to the back of a wall, so that may have been half the problem.</div>
<div><br></div><div>I'm showing the work again, but I'm wanting to make sure everything is safe. I need to hide the adapter due to aesthetic reasons, so I wanted to create a little white box around it with air holes, and I was suggested a fan, although it if it getting hot due to over working, adding another fan might not be a good idea. </div>
<div><br></div><div>It is only a bunch of IR leds that it is powering, so I'm surprised at the power I am needing. </div><div><br></div><div>any help would be very well appreciated. </div><div><blockquote type="cite" style="font-family:arial,sans-serif;font-size:13px">
<blockquote type="cite"><br></blockquote><blockquote type="cite">Here is the Adapter I used : <br></blockquote><blockquote type="cite"><a href="http://www.digikey.ca/product-detail/en/VGS-25-5/102-1928-ND/2045659" target="_blank">http://www.digikey.ca/product-detail/en/VGS-25-5/102-1928-ND/2045659</a><br>
</blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Here are the IR LEDS:<br></blockquote><blockquote type="cite"><a href="http://www.digikey.ca/product-detail/en/QED233/QED233-ND/187410" target="_blank">http://www.digikey.ca/product-detail/en/QED233/QED233-ND/187410</a><br>
</blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">And the Resistors I have on them were 91 OHM 1/4W 5% CARBON FILM.</blockquote></blockquote></div><br clear="all"><div><div dir="ltr"><div><div>
Britta<br></div><i>Technical Coordinator </i><br></div><a href="http://Artengine.ca">Artengine.ca</a><br><div><br>Ottawa Mini Maker Faire<br>Aug. 31 & Sept. 1 2013<br><a href="http://www.makerfaireottawa.com/" target="_blank">www.makerfaireottawa.com</a><br>
@MakerFaireOTT<br>#MMFO</div></div></div>
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