Quote:
Originally Posted by Benno85
Thanks buddy, the price on that little beast is definitley right up my alley (except for the postage  ).
So if constant frequency results in constant revolution, would a well regulated portable power supply be ok for accurate-ish tracking? I'm confussling myself 
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I don't think the regulated DC power supply is good enough..
Given the constant voltage, DC motor speed will depend on load, temperature (grease in gears will be changing consistency with temperature), age of the motor (condition of brushes and bearings) and so on.
All this must be compensated for.
Or if you go for AC motor, rotation rate will depend only on mains frequency.