This circuit was originally designed to drive an engine with a small flower that dances when the microphone picks up a stronger sound. Of course, any type of animation can be coupled to the small engine. The motor is 3 V.

This circuit was originally designed to drive an engine with a small flower that dances when the microphone picks up a stronger sound. Of course, any type of animation can be coupled to the small engine. The motor is 3 V.