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Originally Posted by sanddrag
I don't know what makes up a dimmer switch for lights in a house or office but would that work for 12VDC? (forgive me, I'm not really an electrical guy).
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Apparently, they won't work. I just read an interesting
article on Howstuffworks. They take advantage of the AC to turn the bulb off for a little while at the beginning of each half cycle.
I might get my head bitten off for suggesting this dreaded device again, but maybe you can use a 555. I'm pretty sure it will run on 12V. To make a 50% duty cycle oscillator, it would only take the 555, two resistors, and two capacitors. Then, you could just feed that into a MOSFET. The motor only has to go one direction right? If so, you'd just the single transistor, not an entire h-bridge. You won't have to deal with trying to dissipate as much heat as the resistor will be putting out.