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Hey, David. Why can't you do it with a rotary switch (with as many poles as TT positions) and a bunch of normally closed, SPST micro switches? Here's the plan: 1) Wire the wiper (common) of the rotary switch to one side of the power source. 2) Wire the poles of the rotary switch to the micro switches. 3) wire all the other poles of the micro switches to one side of the TT motor. 4) wire the other side of the motor back to the power source. The micro switches are positioned radially around the turntable and are opened by a tab on the table. Mount the switches so they may be adjusted for precise allignment. When the rotary switch is moved, a circuit is formed thru the rotary switch, thru one of the closed micro switches and the motor. The TT will turn until the tab opens the micro switch associated with the rotary switch position. For my money, I would also put a small solenoid in series with the motor that retracts a holding pin whenever the motor is activated, and a spring which returns it when the motor stops. The pin should be conical so as to further allign the turntable at the current position. The motor and the solenoid will present a large inductive load to the power supply and some reverse current when the motor is turned off, so make sure the power supply can handle it.
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