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PC controls two stepper motors

Based on a Labs project | October 2011 | Find it here
PC controls two stepper motors
This circuit allows a PC or a suitably programmed microcontroller system to control a stepper motor. Rather than relying on the latest in dedicated motor controller ICs, this interface is based on ordinary eMOS logic, discrete transistors and one ULN power driver IC. The Interface is designed with extension in mind, because a doughterboard may be added to control a second stepper motor.
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