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Type of resistor?

post #1 of 7
Thread Starter 
I dont see any other thread that relates to the title so here's my question.
What type/ohm reistor is needed for led's/other stuff to get them down to a 12V dc?
    
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post #2 of 7
It depends on what leds you have, you could get 12v ones and use a spare molex
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post #3 of 7
You can find all you need here and they are great to tlak too as well and will help in any way they can.
http://www.lsdiodes.com/shop/index.p...9e2a1731ad4088
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post #4 of 7
Thread Starter 
i mean what resistor would i need to attatch to the led to run it off the 12vdc molex's
    
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post #5 of 7
depends on the LED's specs. Could you post a link to the ones you have bought.
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post #6 of 7
Thread Starter 
ill check tommorow
    
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post #7 of 7
You need to use Ohm's Law. R=V/I Resistance=Voltage/Current. A basic LED usually runs around 35mA. So in this example, you would do R=12/.035 and it would give you 342.8 ohms. The closest standard value resistor would be either 330 or 390. The safest bet is to use a resistor higher than you require, because you can't burn out a component with too little current. Also, you have to worry about power rating. In this case, you should probably use a 1/2 watt resistor. (Power=V*I=12*0.035=0.42W) If you were to use a 1/4 or 1/8 watt resistor, it would get really, really hot.

I hope that helps.

EDIT: Damn, I just noticed how slow this forum is... Ignore me
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