<p dir="ltr">Your LEDs have a forward voltage of 1.6 volts and you are supplying 5 volts, leaving 3.4 volts for the 91 ohm resistor. Ohms law: current = volts / resistance. Plug in the numbers and you get 0.037 amps per LED, much less than the 0.250 amps that the resistors are rated for. The total current would be 7 amps, which is more than your supply is rated for. </p>
<div class="gmail_quote">On Jul 11, 2013 7:59 PM, "Britta Evans-Fenton" <<a href="mailto:technical@artengine.ca">technical@artengine.ca</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">I'll check it out tonight or tomorrow morning, when I'm with my artwork again to be sure, but I think it might be even more than the 9 amps Michael suggests. <div><br></div><div>How important do you think the other resistors would be. It would be a huge undertaking to re-do this piece. </div>
<div><br></div><div>Here is the work here:</div><div><a href="http://brittaevansfenton.com/System_Failure.html" target="_blank">http://brittaevansfenton.com/System_Failure.html</a><br></div></div><div class="gmail_extra">
<br clear="all">
<div><div dir="ltr"><div><div>Britta<br></div><i>Technical Coordinator </i><br></div>Artengine.ca<br><div><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></div>
<br><br><div class="gmail_quote">On Thu, Jul 11, 2013 at 4:49 PM, Darcy Whyte <span dir="ltr"><<a href="mailto:darcy@siteware.com" target="_blank">darcy@siteware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Why don't you check how many amps you are using?</div><div class="gmail_extra"><div><br clear="all"><div><div dir="ltr"><br><div><div><br></div><div><div>--</div><div>Darcy Whyte</div><div>Twitter: <a href="https://twitter.com/inventor_Artist" target="_blank">https://twitter.com/inventor_Artist</a><br>
</div><div><br></div><div>Art+ <a href="http://inventorArtist.com" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com" target="_blank">rubber-power.com</a> | Software Since '88 <a href="http://siteware.com" target="_blank">siteware.com</a> | Contact: <a href="mailto:darcy@siteware.com" target="_blank">darcy@siteware.com</a> | <a href="tel:613-563-3634" value="+16135633634" target="_blank">613-563-3634</a> by appointment | Canada N 45° 25'03.1" W 75° 42'21.4"</div>
</div><div><br></div><div><br></div></div></div></div>
<br><br></div><div><div><div class="gmail_quote">On Thu, Jul 11, 2013 at 7:41 PM, Britta Evans-Fenton <span dir="ltr"><<a href="mailto:technical@artengine.ca" target="_blank">technical@artengine.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Maybe I'm drawing too much Amps. Would you recommend this AC converter over the last one: <a href="http://www.digikey.ca/product-detail/en/LS150-5/285-1817-ND/1918828" target="_blank">http://www.digikey.ca/product-detail/en/LS150-5/285-1817-ND/1918828</a><div>
<br></div><div>I would have Amps to spare on this one.</div></div><div class="gmail_extra"><div><br clear="all"><div><div dir="ltr"><div><div>Britta<br></div><i>Technical Coordinator </i><br></div>Artengine.ca<br>
<div><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></div>
<br><br></div><div><div><div class="gmail_quote">On Thu, Jul 11, 2013 at 4:32 PM, Britta Evans-Fenton <span dir="ltr"><<a href="mailto:technical@artengine.ca" target="_blank">technical@artengine.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">There are 188 IR leds: <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> All connected in parallel each with their own Resistor ( 91 OHM 1/4W 5% CARBON FILM)</div>
<div class="gmail_extra"><div><br clear="all"><div><div dir="ltr"><div><div>Britta<br></div><i>Technical Coordinator </i><br></div>Artengine.ca<br><div><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></div>
<br><br></div><div><div><div class="gmail_quote">On Thu, Jul 11, 2013 at 4:00 PM, Ken <span dir="ltr"><<a href="mailto:klmckinnon@rogers.com" target="_blank">klmckinnon@rogers.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>It should power a LOT of LED's. How
many were you using and what sort of current limiting resistor did
you have....a quick circuit diagram would tell a lot.<br>
<br>
Ken<div><div><br>
<br>
On 7/11/2013 6:49 PM, Britta Evans-Fenton wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div>
<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>
Artengine.ca<br>
<div>
<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>
</div>
</div>
<br>
<fieldset></fieldset>
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