How many volts do I need to power a white 3mm LED that has a 240 ohm 5% resistor attached to it?
The resistors attached to the LEDs are very small and look like they have red, yellow, brown and gold bands, which is how I came up with 240 ohms, but I'm not positive I'm seeing the colors correctly. The yellow may be white. Is there such a thing as a 290 ohm resistor?
I'm determined not to let good LEDs go to waste, but I don't want to just try random batteries and hope for the best. I want to use the right combination to get the most life out of both the LEDs and the batteries. Thanks in advance for your help.