Rotary Speaker mkII

This is my new improved rotary speaker - with foot pedal speed control. The foot control simply turns a potentiometer that's connected to a PWM circuit driving the motor speed.

This approach is similar to the treble horn of a Leslie speaker.

A piece of PVC duct pipe bend is rotated above the speaker. There's a paper cup (with bottom removed) wedged into the pipe to give more 'fling' to the sound.

Here's what's inside - a motor and belt which are enclosed in the box. You can see the speaker below.

Foot Controller.

This is the mechanism in prototype.

And the finished pedal.

As usual I'm using a Ruby amp to drive the speaker: http://www.runoffgroove.com/ruby.html

Here's a video of it in action with guitar and then keyboards -no other effects.