Author Topic: NPN zombii  (Read 1389 times)

Sam87

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NPN zombii
« on: August 08, 2010, 11:06:12 AM »
Hi guys

I have obtained a load of ac127 Npn trainnies and have two Mached germanium npn trannies left I've from a previous build

Would I be right in saying that to use these trannies in a zombii circuit I would just need to wiring all positives to the negative and visaversa?

My previous build have all been pnp but would like to try and use up the npn I have lying around

Thanks in advance

madbean

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Re: NPN zombii
« Reply #1 on: August 11, 2010, 09:38:20 PM »
The circuit is already negative ground, so you should not have to do anything. I would pop in a couple of regular bi-polars first to see what happens. Try some 2n3904's first.
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Sam87

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Re: NPN zombii
« Reply #2 on: August 13, 2010, 03:03:19 AM »
I know this is a noob question but how does a meg ground pedal work with pnp trannies

lbrooks

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Re: NPN zombii
« Reply #3 on: October 14, 2010, 09:16:00 AM »
The Schematic calls for Germanium PNP Trans.  but if I'm not mistaken the 2n3904's are Silicon NPN.  Should I use the 2n3906, that looks to be PNP?

madbean

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Re: NPN zombii
« Reply #4 on: October 14, 2010, 09:25:00 AM »
I know this is a noob question but how does a meg ground pedal work with pnp trannies

PNP trannies can work with either negative or positive ground configurations. Negative ground schems can lead to oscillation and motorboating from the trannies, so these kinds of fuzzes are generally built positive ground.
I own madbeanpedals (duh). I am part owner of Function F(X).

madbean

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Re: NPN zombii
« Reply #5 on: October 14, 2010, 09:26:27 AM »
I know this is a noob question but how does a meg ground pedal work with pnp trannies

PNP trannies can work with either negative or positive ground configurations. Negative ground schems can lead to oscillation and motorboating from the trannies, so these kinds of fuzzes are generally built positive ground.

Yep, exactly right. The 2n3906 is PNP---I was mistaken in saying 2n3904. I have my transistors socketed on this so I will try a couple of those and see what happens.
I own madbeanpedals (duh). I am part owner of Function F(X).