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the right resistor

Discussion in 'Beginner Electronics' started by jmiller634, Oct 28, 2010.

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  1. jmiller634


    Oct 28, 2010
    Hey guys got a question. I want to add an ultra bright LED from my mini mag light to my atx benchtop power supply. The LED ran off 3v (2 AA’s.) The line I want to use is the 3.3v (14 amp) from the atx to power it. What size/power rating resistor should I use?
  2. jaddie


    Dec 27, 2010
    5 ohms would work, but you can probably get away with none. The LED module for a Mag Lite can run at 3.3 volts because fresh Alkaline batteries can present 1.6 volts each, so the module can deal with 3.2 volts at least, I doubt another .1 volt will matter much.
    Last edited: Dec 27, 2010
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