Here the circuit diagram of Maestro Boomerang pedal / Wah-Wah pedal for electric guitar effect.
Note: Transistors Q1 and Q2 were designated P-2356.
The Maestro Boomerang is not only a wide range wah wah pedal but also a volume pedal. It’s deemed as one of the best wah pedals ever built – and I totally agree. The only other wah that comes close is my Electro-Harmonix Crying Tone.
Download the schematic diagram in PDF document from the following link:
Maestro Boomerang Circuit 9.85 KB
Download Circuit Diagram
Step by step about how to build Maestro Boomerang Wah Pedal guitar effect, visit this page