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LEDs for beginners

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amerish:
Instructables has an excellent tutorial on how to wire up LEDs. With all the emphasis on illuminated buttons, i thought some might find it useful.

http://www.instructables.com/id/E9NFEFO2ZGEV2Z9QKZ?ALLSTEPS

Jeff AMN:
Awesome, I was looking for something like this just yesterday.

TOK:
If you don't want to mess with resistors, you can just get automotive LED's and run them off the 12v (yellow lead) portion of your power supply.

Jeff AMN:
Heh, I was more curious than anything. I'm getting my LEDs from GGG, so all the resistors will be a perfect match for my situation. I just wanted to know more about LEDs, resistors, and calculations.

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