knows this, and rather than put up with the bump and grind of a cheap rotary encoder ... Hooked to an Arduino, the motor made a workable encoder, later improved by sending each phase through ...

I needed a rotary encoder — I pulled a cheap one out of one of those “49 boards for Arduino” kits you see around. Not the finest encoder in the land, I’m sure, but it should do the job.

Arduino Board: The heart of the project. An Arduino Uno or similar board will work perfectly. 2. Rotary Encoder: Used for adjusting the frequency and amplitude of the generated signals.