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Quick Led Question


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#1 dtw_2005

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Posted 26 May 2006 - 06:08 PM

Okay, I'm putting some led under the jewel. I'm putting 8 5mm blue leds off a 12v (i think thats right ... its one of those fan molex things ... tell me if thats not 12v), and i used a resistor calculator to figure that i needed a 56 ohm 3 watt resistor. ... I have a bunch of a bunch of 100 ohm resistors. Can i wire a few resistors in series, and the leds in parallel?? If so, How many of the 100 ohm resistors. I was thinking 6, but thats me just 1/2way understanding and making the best guess.

#2 SICKdimension

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Posted 27 May 2006 - 01:53 AM

You can't use the 100 ohm 1/4 watts to replace a 56 ohm 3 watt resistor. What you can do though is instead of wiring it in parallel to 12V, wire it to 5V and put one 100 ohm resistor per LED.

#3 no0b123

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Posted 27 May 2006 - 02:09 AM

I would connect all your LED's to the RED wire (5V). Then use SICKdimension's resistor calculator (found at his web site) to calculate which resistor you need. That way you have 8 led's and one resistor!




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