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Water pipe equatorial
This is what I have done a long time ago for my 10" mirror (it does not exist any more, today it is on dobsom mount).
The drive mechanism used parts of the theodolite (Now I regret this decision because this theodolite may today be considered as very valuable historical item).
In first phase, hour angle motor was sinchronious (driven from sinusoidal generator with variable frequency) and Dec motor was DC.
Later I used DC motor for hour angle as well. The driver circuit used closed loop to lock the speed of the motor with precise frequency generator.
Bojan
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