Bipolar Stepper Motor Controller

Here's a little circuit that simplifies interfacing to bipolar stepper motors. It's similar to a common unipolar design available on the internet. However, I modified it to use a pair of MOSFET-based H-bridges. In addition, I added an enable signal so that the motor windings can be disabled to save power. Since there are diodes embedded in the transistors, there's no need to add flyback current protection across the motor windings.

A couple of notes: ORCAD does not explicitly show the power connections for the logic devices so be sure and connect the flip-flop and XOR gate packages to...



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