Please with the schematic! Also, I wrote calibration software for critical medical devices -- a whole experience by itself -- with infusion pumps running anywhere up to 250 rpm with 512 A and 512 B pulses per revolution, and a home pulse. Calibration involved gently adjusting the optical quadrature unit while observing data in real time before applying a superglue to lock things up. No problems. Nothing like what i see there. Need schematic to have any hope. What's your max speed and other details?
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