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Rob, What I said is, that a simple electronically regulated speed control is not accurate. Stepper motors are accurate. They require a different circuit specifically designed to drive them. They are 2 different types of drives.
eg. 12/35 volts input > a 7805 regulator circuit (0 to 5 volts, adjustable, at 1 amp. out),> to motor/gearbox = NOT ACCURATE ENOUGH!
As stated, the 7805 is only an example. These CAN BE USED FIXED OR ADJUSTED for different output voltages or another reg. used to suit the motor input voltage.
It's hard to explain in great detail here.
Have attached sample.
Let me know if you req. more details.
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