PWM @ 100Hz is likely to be *very* noisy and the motor probably won't like it much either.
Graham
emitter followers / Darlington - need help
Dec 14, 2006
23 Replies
So, recommend 500 Hz? 1 kHz?
something similar (phase chopping at 100Hz) is used to control hand-held AC power tools so it can't be too bad.
OTOH going to a higher frequency is unlikely to be a bad thing.
Bye. Jasen
I once used about 100 Hz for a 12V, 1.5A motor, on a 24-36V supply, current regulated by the switch, and it worked fine, and virtually noiselessly. The guy who I was doing this for said that the guy who had done the original, which I was ripping off, whined under torque. Mine didn't complain at all. :-)
Admittedly, I had used a TIP36C and a nice heat sink. :-)
Cheers! Rich
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