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3V Resistor and LED Answered

What would be a good Ohmed resistor for an LED running on a 3V power source? 3.2-3.4V typ with a 3.8V max.

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Goodhart

9 years ago

This would depend, somewhat, on the amperage of the power supply.

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GoodhartBrennn10

Reply 9 years ago

Most LED's will need no more than a 27-28 ohm resistor. IF it is a blue LED however, it will require more voltage with NO resistor just to light it. :-)

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lemonie

9 years ago

Something under 100 Ohm, but you'd probably be fine without. Exactly how much current do you want and what's the 3.2-3.8V supply? L