A PNP Fuzz Face with Voltage Feedback Integrator using a TL072, which provides a regulated and automatically adjusted transistor bias. This allow you to use vintage transistors which greater leakage, and non-ideal HFE. Use a vintage Germanium or modern Silicon or mix/max depending on the sound you are after.

The BS250 Mosfet provides reverse voltage protection and on-board led lights when connected to reverse voltage.

-500k-pot is for Volume - B taper works but C taper is ideal.

-1k-pot is for Fuzz

-200k-pot is for active feedback bias control

-toggle switch is 6 pin, on_on_on - look for red switch on amazon or aliexpress.

I highly recommend installing header pins for swapping in and out transistors.

Board employees a TL1054 to create regulated negative voltage, which is filtered clean via axial style inductors.

0v terminal is connected to ground via breakable jumper. Similarly the -9v pin is breakable via jumper. These would typically be left as is and the terminals wouldn't be used except for test, but Breaking the jumpers would allow you switch to power and ground to the Fuzz side of the circuit, for example you could connect power to 9v/G so the power regulation is always active, break the terminal at 0v and then connect switched pedal Ground to that lug. The -9v is mostly for test but could possibly be creatively used for modifying.