Stepper Motor Organ

This is an experimental instrument I built that uses backdriven stepper motors to synthesize sound. The operational principle is that when stepper motors are backdriven, they induce a pseudosinusoidal alternating current. If this signal is amplified and connected to a speaker, you can listen to it as sound. The pitch of the sound is determined by the frequency of the wave, which depends on how fast the motor is backdriven. Higher speed will be a higher note. I thought this sound was interesting, so I w