Do you want it to go only in one direction?
If so just use four irf9530's or irf530's in parallel depending on if
you want to control the high side or low side. Be sure to use a 10k Ohm
resistor on EACH gate or they will explode in quick succession.
If you want to have a reversible driver then use the above mentioned
fets in an h-bridge. http://www.4qdtec.com/bridge.html
For more circuits try:
And as for surplus motors:
or for new motors try:
You probably won't find any decent motors with a gear reduction that
fit your description for under $250, but then compared to some $1000+
high efficiency motor that is fairly low cost.
A lower-cost controller is the unit made by Tecel:
I have one, I haven't used it yet, though. Says it'll handle up to 60a, and
it costs around $35. I'm looking forward to testing it out.
As for motors... either buy surplus or have a look at the various robot
combat suppliers. Lastly, take a look at electric scooter motors.
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