Death by fuzz question

[SprinkleSpraycan]

I'm building a DBA fuzz war v1 from a pcb. All is going well but I'm curious about how the bias control works. It causes oscillation when I turn it down. Is that normal? And why does it do that? I was expecting it to create a more gated/sputtery sound.  Thanks

[MikeA]

Could you post the schematic?  That will make it easier for someone to assist.  There's more than one PCB source for this circuit and they may be different. <edit - I see you just added it, thanks!>
What's called "bias" here is adding variable resistance to the +9V bus, same as the Stab pot in a Fuzz Factory.  It changes the bias of all the transistors at once and the primary function is to make the circuit oscillate.  If you want gating, try changing the bias of one transistor at a time (like Q1 with the Fuzz control, or add a similar control to Q2.)

[antonis]

Anyone can say anything when dealing with BJT reverse action mode..

[SprinkleSpraycan]

Awesome. Thanks for the info!

Could you post the schematic?  That will make it easier for someone to assist.  There's more than one PCB source for this circuit and they may be different. <edit - I see you just added it, thanks!>
What's called "bias" here is adding variable resistance to the +9V bus, same as the Stab pot in a Fuzz Factory.  It changes the bias of all the transistors at once and the primary function is to make the circuit oscillate.  If you want gating, try changing the bias of one transistor at a time (like Q1 with the Fuzz control, or add a similar control to Q2.)