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I thinking of buying a bunch of bulk LEDs and wiring in a few here and there. Most of the ones I see say they run off of 5 or 6 volts. How do I figure what resistance of resister to buy to drop the voltage down?
 

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You can wire a group of 6 in series and be at about 2-4 volts, which is right in their operating range. Like this:


If you use less LEDs make sure you add a resistor on the positive side before the first one or you’ll burn them out.

Good Luck.
 
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