[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly ... pins hooked up to the motion controller upstream. The Arduino source for this can be found ...

A motorized mount with altitude and azimuth control is basic ... was to use a stepper motor like he did on the other two axes, but with a spare high-torque servo at hand, he hacked a quick proof ...

Diodes has created a servo motor controller, complete with H-bridge mosfets and provision for potentiometer position feedback, for brushed dc motors in automotive manual headlight beam servos and ...