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I have a string of like 20 L.E.D's do i need a resistor? Answered

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S1L3N7 SWAT

10 years ago

Yes, you will need a resistor.

Go here:
http://led.linear1.org/led.wiz

Fill in the info for your array and it will calculate the required resistor(s). If you don't know the voltage on your LED's then it's most likely 3-5v. And the current should be 20ma.