switching between transistor on Fuzz pedal

[nognow]

Hey!
I am building my first NPN fuzz and I was wondering whether it is possible to switch between BC108 and BC109 using on/on DPDT switch?
like this(only with both the Q1 and Q2 obviously,and with both of their B's and C's wired to board)


Thanks!

[GibsonGM]

Well, you probably COULD, but it would be a lot of effort for little gain, in my opinion.  Don't forget, the bias will change, too, and you'll probably get a nasty *POP* when you switch.

I'd just as easily build another fuzz, and switch between the two CIRCUITS, myself...I don't think transistor switching is a good idea.  But, it's a good question!   And it's been done before, in other applications...

Welcome to the forum

[kaycee]

It's not worth switching between a 109 and a 108, you'll hardly hear a difference. Maybe a lower gain with the 8 or 9, better still a germanium. You'll need the bias as an external control, which isn't a bad thing as you can tune a lot of good tones using it. Beavis Audio research site has a page of switching applications, transistor switching being one of them.

[nognow]

It's not worth switching between a 109 and a 108, you'll hardly hear a difference. Maybe a lower gain with the 8 or 9, better still a germanium. You'll need the bias as an external control, which isn't a bad thing as you can tune a lot of good tones using it. Beavis Audio research site has a page of switching applications, transistor switching being one of them.

Well, you probably COULD, but it would be a lot of effort for little gain, in my opinion.  Don't forget, the bias will change, too, and you'll probably get a nasty *POP* when you switch.

I'd just as easily build another fuzz, and switch between the two CIRCUITS, myself...I don't think transistor switching is a good idea.  But, it's a good question!   And it's been done before, in other applications...

Welcome to the forum

Thanks!

[kaycee]

Also, you only want to switch Q2 which does the clipping. Q1 is just an amp and you won't hear much if any difference. I find a low gain in Q1 is best, under 100hfe, but then I'm not a high gain guy.