Circuit check - Fuzz pedal

[überfuzz]

I'm planing to build a fuzz box out of spare parts. It's based on the notorious Fuzz Face. I just put together a scheme and I'd like to get some pointers on it.

Trim was added because I read that it helps controlling the sound of the Fuzz in a good way. Ge is germanium transistors ans Sil is silicon transistors. All values are uF and Ohm.

Scheme

[imaradiostar]

Interesting idea- have you built it yet? How does it work?

I've wondered if this would work or if you'd need to switch the emitter or collector as well.

jamie

[überfuzz]

No I haven't build it as of yet. I'll let you know how it sounds when it's ready.

I guess I'll only use one of the 'channels' but it's fun to be able to test both silicon and germanium.

[pdf64]

Compared to a regular FF, I think that the 20k pot would be 1 or 2k, and the 470k would be 470ohms.
RG Keen advises that with Si FF, small caps between C-B could be fitted to reduce fizz, see
Technology of the Fuzz Face - Frame Definition

[überfuzz]

pdf64 - Thank, puh! I intended to use the 470 as you pointed out. I know about the 20k pot, but this is going to be an überfuzz. Seriously, I just put it there in the scheme, I might as well order a proper one. That cap you're talking about could be fitted as a fix later on. I'll keep it in mind.