I made this monster servo from a wiper motor. Using an H-bridge amp from Lynxmotion and a Parallax servo board. The POT is not hooked up to the motor shaft yet for this test, and I am turning the POT by hand, controlling the speed and direction of the wiper motor. When the POT is coupled to the motor shaft, VSA will control it. With a couple of these I can animate arms and hands, as this servo has TONS of torque.
Here is a vid of the test:
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