Comments on: Which LED lead is Ground? http://www.diylive.net/index.php/2006/02/10/which-led-lead-is-ground/ Do-it-yourself projects and technology updates Wed, 08 Sep 2010 10:48:59 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Greg Lipscomb http://www.diylive.net/index.php/2006/02/10/which-led-lead-is-ground/comment-page-1/#comment-402 Greg Lipscomb Fri, 10 Feb 2006 20:24:33 +0000 http://www.diylive.net/?p=127#comment-402 Now, I have a bigger question. If you find a bucket full of LEDs, I do not know how to figure out the voltage rating for them. How do you decide the resistor value for an LED when you don't know the LED values? There has to be a way, if anyone knows then leave a comment. Oh and Brandon, all you have to do for the IR LED, is you could build a detector circuit that was permanently mounted, with a transistor, and another regular LED. You could shine your infrared LED at your new circuit, and if it is on, your circuit would turn on the visible LED. It would be kind of a checker. That way you would know if you accidently fried your IR LED. (Which I have done several times sadly) Now, I have a bigger question. If you find a bucket full of LEDs, I do not know how to figure out the voltage rating for them. How do you decide the resistor value for an LED when you don’t know the LED values? There has to be a way, if anyone knows then leave a comment.

Oh and Brandon, all you have to do for the IR LED, is you could build a detector circuit that was permanently mounted, with a transistor, and another regular LED. You could shine your infrared LED at your new circuit, and if it is on, your circuit would turn on the visible LED. It would be kind of a checker. That way you would know if you accidently fried your IR LED. (Which I have done several times sadly)

]]> By: Greg Lipscomb http://www.diylive.net/index.php/2006/02/10/which-led-lead-is-ground/comment-page-1/#comment-400 Greg Lipscomb Fri, 10 Feb 2006 18:51:46 +0000 http://www.diylive.net/?p=127#comment-400 Really. I have never seen one that way. That is interesting. Well, I guess it is not a fool proof plan, but it is a "general" guideline. You could always just put a small voltage on it, and flip it around until it turns on. Honestly, that is what I do :) Really. I have never seen one that way. That is interesting. Well, I guess it is not a fool proof plan, but it is a “general” guideline. You could always just put a small voltage on it, and flip it around until it turns on. Honestly, that is what I do :)

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