Quote:
Originally Posted by Bradical
Can't use PWM on a DC motor unfortunately, DC doesn't have a frequency to modulate.
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Sure you can, it works great!
You use PWM to introduce the modulation to the current. As long as the frequency isn't too low to keep the motor spinning, you're good. This is what modern cars do instead of the hockey pucks and resistor coils Porsche used on our cars. I'm sure something could be whipped with a 555 timer and a potentiometer (in the old rotary switch housing) pretty quickly. If the nasty old used one I've ordered doesn't work out, I have a feeling a trip to Radio Shack is in my future.