This is a variation on the ubiquitous Bazz Fuss circuit that I made into a pedal. The name is a for a special friend.

It has Butter (Thickness) and Level controls.

The transistor is a 2N3904 NPN BJT. The diode is 1N5819.

This circuit is based on the standard Bazz Fuss with a "self-biasing" diode for biasing the transistor, rather than the standard voltage divider network.