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Help powering fan LED's seperately - Page 2

post #11 of 17
1/8 - 1/4 watt resistor should work for the amount of leds on a fan.
post #12 of 17
Thread Starter 
Cheers for everyones help...Done it now and its spot on what i wanted
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post #13 of 17
GREAT! you should post up some pic's
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post #14 of 17
Yea id like to see the ones i did are kinda messy.
    
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post #15 of 17
Thread Starter 
Will do when I get a chance
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post #16 of 17
Quote:
Originally Posted by iCrap View Post
you need a molex connector, 100ohms resitor, and some extra wire.
Cut the LED wires that go into the fan, leaving them as long as possible. Splice the positive wires together and the negative wires together. Then connect them to your 5v molex with a resistor inbetween.

Il post a picture if you still need help.
How do you know what resistor he will need without knowing anything about what leds he plans on using?

Also you vaguely described hooking up all the led's in a parallel configuration just so you know the proper terminology next time.
The writeup you posted shows them being wired in series.


Ok, now to the OP,

Once you figure out the number of led's you will be using along with the forward voltage, and forward current of each you can use this noob friendly calculator to know the proper resistor to use along with which wiring configuration will work best for you.

http://www.quickar.com/noqbestledcalc.htm
Edited by Tw34k - 5/12/11 at 9:32am
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post #17 of 17
Thread Starter 
For all your info, I was wiring two Enermax Appolish fans to a molex...

I think the fans have 15 LED's each (or there abouts). I bought a 68 ohm 1/4 Watt resister and wired it in parallel to the yellow 5V. It didn't work...To many LED's i guess, so I tried it on the 12v Red and both fans LED's fired up perfectly.

So basically, iCraps guide was useful, but as Tw34k says, it can be totally diff depending on the fans involved.


Edited by ManOnFire - 5/13/11 at 9:42am
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