Cybercow
Well-known member
Another excellent project from PedalPCB - the Twin Face Fuzz. I happened to have a couple of excellent Ge BJTs, an NKT275 and a Mullard/Philips CVxxxx something or other. (I neglected to look closely and write it down before I buttoned up the box.) But in any case, it sounds awesome. It seems that EVERY PedalPCB project I build out simply works the first time I test 'em before boxing 'em. The only PedalPCB build I've ever had trouble with is the 'Procrastinator' - which now sits in my "box of shame". I think I fouled something up with JFET(s) and probably just need to get back into it track down the issue(s). But for the most part, as I do a build and populate a PCB, I'll make I have the correct value by measuring the parts with my DMM. That ensures I don't inadvertently put in a 4K7 where 470K belongs. In pre-measuring the passive parts, I usually get a build to work right the very first time. (Fingers crossed.)
The BC108Cs happened to be in my stock, so I went with those for Si side. And to honest, I can barely tell the difference between the Ge and the Si when playing it loud. When I turn the amp down lower and crank the Twin Face, I can hear some difference in the sound a bit better. Still, it's a pretty cool circuit. The trimpots were easy to adjust to taste. There is a wide range in the trimmer sweeps where both the Si & Ge sound really good. The only difference between the extremes in the trimmer ranges is how a note would decay. At the minimum sweep of the trimmers, the decay seems to gate a bit. But turning the trims up a bit more, that decay gating goes away and the fuzz fades nicely as the note or chord fades out.
And the guitar's volume knob has a lot of interaction with this build. Things clean up nicely when I turn guitar volume down and gets nasty again when I turn it up. Woot!
Now on to the photos . . .
I hid the bypass LED under the waterslide, so it's subterranean. You can see it lit up between the two red knobs.
And some other build progress shots . . .
The guts before stuffing - rocked it before I boxed it. After rocking it before the boxing, I removed the socket pins and soldered them directly to the PCB.
And a close up of the NKT275 for Q1 on the Ge side.
Anyway, thanks for looking. Happy building!
The BC108Cs happened to be in my stock, so I went with those for Si side. And to honest, I can barely tell the difference between the Ge and the Si when playing it loud. When I turn the amp down lower and crank the Twin Face, I can hear some difference in the sound a bit better. Still, it's a pretty cool circuit. The trimpots were easy to adjust to taste. There is a wide range in the trimmer sweeps where both the Si & Ge sound really good. The only difference between the extremes in the trimmer ranges is how a note would decay. At the minimum sweep of the trimmers, the decay seems to gate a bit. But turning the trims up a bit more, that decay gating goes away and the fuzz fades nicely as the note or chord fades out.
And the guitar's volume knob has a lot of interaction with this build. Things clean up nicely when I turn guitar volume down and gets nasty again when I turn it up. Woot!
Now on to the photos . . .
I hid the bypass LED under the waterslide, so it's subterranean. You can see it lit up between the two red knobs.
And some other build progress shots . . .
The guts before stuffing - rocked it before I boxed it. After rocking it before the boxing, I removed the socket pins and soldered them directly to the PCB.
And a close up of the NKT275 for Q1 on the Ge side.
Anyway, thanks for looking. Happy building!