Ah, I used 1v2, was thinking about optocouplers...<br>You still want to de-rate your resistors significantly, 3 or 4 times is normal.. <br><br>Michael<br><br><br><br><br><div class="gmail_quote">On Thu, Jul 11, 2013 at 9:20 PM, Andrew O'Malley <span dir="ltr"><<a href="mailto:aomalley@gmail.com" target="_blank">aomalley@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The 7 amp calculation is correct. Try to find a 5V @ 10A supply and you should be good, assuming the circuit is as you described. The one you linked to is 26A which is a bit overkill (though nothing wrong w/ using it, it will only supply the amount of current required by the circuit).<div class="im">
<br>
<br>>>> Maybe I'm drawing too much Amps. Would you recommend this AC converter<br></div><div class="gmail_quote"><div class="im"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
>>> over the last one:<br>
>>> <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><br>
>>><br>
>>> I would have Amps to spare on this one.<br></blockquote><div><br> </div></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Your LEDs have a forward voltage of 1.6 volts and you are supplying 5<div class="im"><br>
volts, leaving 3.4 volts for the 91 ohm resistor. Ohms law: current =<br>
volts / resistance. Plug in the numbers and you get 0.037 amps per LED,<br>
much less than the 0.250 amps that the resistors are rated for. The total<br>
current would be 7 amps, which is more than your supply is rated for.<br></div></blockquote></div>
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