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Very simple Stepper Motor Driver Concept, suggestions or input? Answered

Here is a concept stepper motor driver that I came up with. It supports half-stepping too. Any comments or suggestions are appreciated as I know that this thing is far from perfect. I also am making a 3-Axis CNC DB25 version schematic of this controller which I will post up later.

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So how does this compare with the stepper motor drivers that already exist and have datasheets for?