8 3.7-4.5V LEDs to 12V car battery HELP
8 3.7-4.5V LEDs to 12V car battery HELP
(OP)
I have 8 LEDs that are 3.7typical V , 4.5V max input and 20mA and i want to run them from my car battery 12V, ~13.2V when car is running how shoul di go about making the circuit. where should i put the resistors and what ohms should the resistors be, i also want the LEDs to shine their brightest, thanks for you time and help.





RE: 8 3.7-4.5V LEDs to 12V car battery HELP
RE: 8 3.7-4.5V LEDs to 12V car battery HELP
RE: 8 3.7-4.5V LEDs to 12V car battery HELP
Here’s how:
LED VF = 4volt
Supply V = 14volt
Supply V – LED VF = 10
LED I = .02
10 / .02 = 500 ohm
(.02 *.02) * 500 = .2 watt