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I just wanna wire some LEDs around the car to light up some darker spaces etc. and if that works, im gonna make a CD power adaptor coz i dont wanna shell out $30 for a simple car adaptor from sony.

If i have more LEDs, do i just multiply the amperage by the number of LEDs i have? So if a LED needs 20mA, then does 2 LEDs need 40mA? Also, im gonna use those bright hi-intensity with the clear plastic (white or blue) LEDs, not those cheap green/red/yellow ones with colored plastic. Ill try...

Awesome, thanks... but how do i set it to the voltage i want? Do i use the pot to set it?

Hi, I'm trying to lower a 12V DC voltage source to around 3-4.5 volts (tapping power from my car's cigarette lighter to light up some LEDs), but i have very little to no technical knowledge of electronics whatsover (i know the very basic BASICS), but i can solder and stuff okay. My friends...