Quote:
Originally Posted by Stef
Just some info on LED's
Red, Green and Yellow needs 1.7V and 20mA (absolute max is 40mA)
Blue and White LED needs 3V / 20mA (max 40mA)
(voltage can change a bit due to make or current)
So 1 blue or white LED needs next resistor:
12V-3V = 9V ( U over resistor) then 9V/0.02A = 450ohm resistor
(470 ohm is standard value).
You can use 3 white LED's in series, leaving a drop of 3x3=9V
Then you need a resistor:
12-9 = 3V > 3V/0.02 = 150ohm ( 180 or 120ohm is a standard value)
Mind also that the car voltage can go up to about 14V.
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I think that you are wrong
Here a leave a link to a resistor calculator
http://www.dotlight.de/shop/rcalc.ph...97a32636ef7e0c
