The Phobos Fuzz is a clone of the Coloursound Tone Bender Mark 3 (three-knob). The Phobos project has a voltage inverter which allows you to power the effect with a standard center-negative adapter while maintaining the positive-ground operation of the original. The pcb also includes space for biasing trim pots so you can dial in a perfect bias without having to swap out resistors.
The dimensions of this pcb are 49,5mm x 49,5mm. It is also available as ready to solder kit:
This project is by Aion Electronics. Since the modifications featured in this project require some basic knowledge, this project is rather for more experienced builders.
Here is the direct link to the manual with layout and schematic:
Here you can find build reports on this project: Build Reports