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Old 11-01-2006, 09:46 AM   #1 (permalink)
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Default What size resistor?

I need to know really quick what size resistor to get for four blue LED's.

I don't know the specs on the LED's, but I would imagine they are 3.3v.

Anyone?
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Old 11-01-2006, 09:57 AM   #2 (permalink)
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depends on what rail you want to run them off. i think in series 4 L.E.Ds could be run without a resistor from the 5v line. i think in my xbox modding days i used to use 100ohm resistors with lights in parallel from a 5v source
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Old 11-01-2006, 10:14 AM   #3 (permalink)
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I know that I have can run four ultrabright white LEDS off a 12v line using a 220ohm resistor and they still operate correctly... Till the base in my car hits, then they dim, rofl.
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Old 11-01-2006, 10:30 AM   #4 (permalink)
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Quote:
Originally posted by charles_scott
I know that I have can run four ultrabright white LEDS off a 12v line using a 220ohm resistor and they still operate correctly... Till the base in my car hits, then they dim, rofl.
kind of a useless post but it is spelled bass..... anyways wut kind of system you got?
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Old 11-01-2006, 12:58 PM   #5 (permalink)
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I'm going to use a 5v source.
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Old 11-01-2006, 01:11 PM   #6 (permalink)
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I tried running the four in a series, and only two came on...and very dimly.

Damit, I guess I need some new LED's lol.
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Old 11-01-2006, 02:37 PM   #7 (permalink)
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Four Kicker Comp C12's and two 1000 watt sony amps with two four farad capacitors...
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Old 11-01-2006, 06:49 PM   #8 (permalink)
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oooo my dad has a digital designs 9515f witha 2x 100hc us amps..... they put out close to 1000 a piece when bridged... i can post some pictures of it when it is done.... it will be a while because he is still workin on it and he isn't making steady progress....
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Old 11-01-2006, 07:53 PM   #9 (permalink)
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Yea, mines kinda just thrown in at the moment, hard to fit kicker c12s in a small car... im having to use the minimum req. sealed air space for the things... thats still 4 cubic foot total...
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