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Originally Posted by Groth
Audible noisy or electrical noisy? For electrical it wouldn't be a big deal, assuming you have J4-4 be your PWM signal and have the power transistor and, more importantly, the fan's ground off board.
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Electrical. OK, suggest a good PWM circuit. Emphasis on noise reduction and simplicity.
Wouldn't I need some common ground connection? Oh. Not with an optocoupler.?