The easy peasy stepper driver/stepper motor test circuit

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Rohit Gupta writes:

I made a very easy to make stepper driver and motor tester that could be useful to people working with steppers for 3D printers or CNC.
I saw an article a while back here on DP and HackADay itself that used a controller (ATiny45 i guess). I thought it would be useful to do it with a 555 timer.

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