This Week on the Breadboard: The Spirit in the Sky Fuzz

[Chuck D. Bones]

Mode 4 allows Q2 to be biased at or near saturation. The FUZZ pot not only varies the gain. it also varies the bias.

 

[Chuck D. Bones]

Here's an alternate BIAS circuit:


Q1 HFE ~ 100
Q2 HFE ~ 140