MYREDCHEVY
Newly Enlightened
Still working on the solar light project. This is what I got. After a full day charge the batt. had a voltage of 3.6v. I figure they should be 2.4 (rechargeable AA type- 1.2v?) The question is how to find resistor value, so I don't cook my LEDs. I'm going with a single blue one. Its rated at 2.1 foward v. and 2.8. max. Now correct me if I'm wrong. Subtract foward voltage from supply and divide by current to get resistor value. 3.6-2.1(dev.).02=75. I then would use a 75ohm resistor. Did I do my home work right?