Schumann F Loop

 Here is a an old, rare and weird one traced by Deadend Fx.

It is a feedback looper that includes both modulation and an active filter sections. If you you don't like the hassle with the offboard wiring this layout requires, Deadend Fx has nifty PCBs for sale.

Schematic and more info HERE.

 

Deadend Fx Grimmafuzz / Schumann PLL fuzz section

 Schematic and more info is avaiable HERE.

 

 

Schumann Lion

 Modified for normal DC power supply with onboard voltage inverter and voltage regulators.

The layout is based on THIS schematic.