Les Kerr explains the circuitry used to control stepper motors. Acircuit for a stepper motor controller that uses the stepper motors is show in fig 9 and photo 4. It is made from six inexpensive CMOS ICs and a couple of transistors. It can be stepped one step at a time by the change over push button or it can free run, the speed is varied by the 1M potentiometer. The direction of rotation can be changed with a toggle switch. Stepper driver operation For those interested in electronics, the following is a brief description of the operation of the stepper motor driver board.
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