Originally Posted by
george65
What about something like these DC speed Controllers?
I have a heap of them on different things and found them to be very reliable and take a lot more amps than their ratings. Being PWM they will reduce the speed without reducing the motor torque which if he wants to play trains with the things would be ideal.
You could build it into the body of the car and remove the knob if you want and adjust the thing with a small screwdriver through a hole.
There are different versions of the things in different amp ratings so you could get what ever you needed but the 10A versions are pretty cheap anyway.
-SOME- of the Ac versions work on DC as well if you need a lot of power capacity. I have one on a solar feed for limiting DC through a heating element.
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