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The only thing I coudl think of, is building the servo circuit, and using a hex inverter, with an AND gate to clean up the sync pulse to make it digital-like, and then using that now converted clock of 12.5hz to drive the step input of the controller, but that only works if it was one revolution per step, which is never the case. I would have to calibrate it somehow. If i used the sync seperater output to drive the servo directly, then no need for optical block, or pll. Because steppers are that damn accurate. lol.
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