hi phil,<div><br></div><div>that link states that the forward voltage is rated @ 3.4 volts with a 20ma draw; however they can be powered at 3.0 volts with approx. 10ma draw.<br clear="all"><br>nick<br><br>
<br><br><div class="gmail_quote">On Sun, May 20, 2012 at 10:16 PM, Phil Spitler <span dir="ltr">&lt;<a href="mailto:phil@bonfirelabs.com" target="_blank">phil@bonfirelabs.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div style="word-wrap:break-word">Hi,<div>For simple LED projects, I usually use an online LED calculator to get the values for the needed resistors.</div><div><br></div><div>I have just ordered some LEDs online but the specifications don&#39;t list the forward voltage, just the current draw.</div>

<div><br></div><div><a href="http://www.adafruit.com/products/679" target="_blank">http://www.adafruit.com/products/679</a></div><div><br></div><div>How would I figure out how to power the LEDs and what resistors to use?</div>

<div><br></div><div>I am thinking of using 10 LEDs and having them all powered, all the time.</div><div><br></div><div>I would love to know how to calculate my needs.</div><div><br></div><div>Any ideas?</div><div><br></div>

<div>Cheers.</div><div><br></div><div>Phil</div><span class="HOEnZb"><font color="#888888"><div><br></div><div><br></div><div><br><div>
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<div><div style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font:normal normal normal 12px/normal Helvetica;color:rgb(93,16,18)">Phil Spitler |   Associate Creative Director  |  Bonfire Labs |  t : <a href="tel:415.394.8200" value="+14153948200" target="_blank">415.394.8200</a>  |  c : <a href="tel:415.571.3139" value="+14155713139" target="_blank">415.571.3139</a>  |  <span style="text-decoration:underline;color:rgb(0,25,241)"><a href="http://www.bonfirelabs.com/" target="_blank">Bonfirelabs.com</a></span></div>

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