can you u get 12 volts down to 3 volts by using a 5 volt regulator and a 1/4th wat resistor?

i need my car to go from 12 volts to 3 volts for LEDs... please help me!

Rainh2o8 years ago
Why not just build a 3 volt regulator
frollard8 years ago
Agreed with lemonie - use 5-10 leds in series to drop the voltage - WAY more efficient that way, instead of burning off 75% of the power in a resistor.
if its just for LEDs you could put a couple in series with a resistor, and reduce the power dissipation in the resistor.
lemonie8 years ago
You can omit the regulator, put your details in here:
http://led.linear1.org/led.wiz

L