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  1. M

    Dual Speed Control Circuit

    Thanks. Could someone tell me a good place to order the components? Our Radio Shack is gone. Phil
  2. M

    Dual Speed Control Circuit

    The blue diode is marked "DB4, X449" as far as I can tell. The components on board are marked "R", "D", and "C" (I assume, resistor, diode, capacitor). The micro-switch which controls the circuit is an Omron D2MC-5F (photo below). Phil
  3. M

    Dual Speed Control Circuit

    This circuit works, but it is no longer being manufactured, so I would like to make another. I will try to read the blue diode. Phil
  4. M

    Dual Speed Control Circuit

    I'm hoping to reproduce a speed control circuit. It powers a 110v AC universal vacuum cleaner motor which is installed in an old-time payer piano. The electric suction motor overcomes leaks in the old foot-pump player piano. It's designed to provide two, pre-set motor speeds; a high-speed for...
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