3V Resistor and LED

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.

Goodhart8 years ago
This would depend, somewhat, on the amperage of the power supply.
Brennn10 (author)  Goodhart8 years ago
It is about 75mA.
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. :-)
lemonie8 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