Si PNP rangemaster?

[patricks]

Hi everyone,
This might be a basic question, but is it any easier to adapt a rangemaster to negative ground using a silicon PNP transistor?
I've got a few Si PNP transistors hanging around and I'd like to use them up, and a rangemaster or fuzz face would be an easy way to do that.
There are negative ground PNP schematics around, and I've seen a PNP fuzz face work negative ground that swaps the collector and emitter of the transistors.

What's your experience with either of these approaches, and would it be easier work a silicon transistor rather then age?

[Rob Strand]

For a silicon unit it makes more sense to use an NPN with negative ground.

You can definitely use a PNP with negative ground.  Good idea to use a very large bypass cap on the power rails.   It's really just asking for noise problems which you don't get with the NPN.

[Phend]

Check out, the schematics on the General Guitar Gadgets website.

[patricks]

For a silicon unit it makes more sense to use an NPN with negative ground.

You can definitely use a PNP with negative ground.  Good idea to use a very large bypass cap on the power rails.   It's really just asking for noise problems which you don't get with the NPN.

Totally makes more sense to use NPN, just along cos I happen to have some PNP units sitting about.

Check out, the schematics on the General Guitar Gadgets website.

Thanks for the pointer. I've seen versions that use a charge pump.

I might try the ridonculous large capacitor on the power rail, and if that's too noisy just swap for an NPN