the right resistor

[jmiller634]

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?

 

[jaddie]

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.