Gday Damien
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I say that as I'm making a DC motor controller at the moment to control a Meade focuser.
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I have made several of them to drive my Meade microfocusser.
Some used cheap Picaxes, some used std PIC and some used pure passive ICs.
Focus at any speed or direction with only one centre click potentiometer.
As its only driven by PWM, no complicated driver chips are required.
Andrew