anyone used a continuous rotation resistor for a dc motor for tracking position like this one from digikey:
http://www.digikey.com/product-detail/en/3382G-1-103G/3382G-1-103GTR-ND/1944266
manufacturer is Bourns. I need to track rotation of motor, to linear motion, like a lead screw. motor is 6v, ~1500rpm. only need to track about 20 revolutions in either direction. anyone have any other cheap suggestions, that are relatively small in size.