Negative Ground Fuzz?

[mattpocket]

Is there any -ve ground fuzzes out there? I got a mixed batch of germaniums that are itching to be used... there are a lot of PNP, a few ac128s, and some other cool ones, I will test them all for hfe and leakage, but I need a circuit to put them in...

Can I use PNP trannies in a -ve ground pedal? My harmonic perculator has a PNP in it and its negative ground...

Matt

[GREEN FUZ]

Check out these Fuzz Face variations.

[petemoore]

  And use or steer right past the first one. Tha's a Neg Gnd PNP FF...expect possible intractable problems or working FF.
  I suggest wiring up a PNP Pos Gnd. FF, tweeking on that some with a battery, then using a MAX1044 to reverse PS polarity so that the FF can be put into use with other Neg Gnd effects.
  I get great results and improved temperature stability, using hybrid EZ Face [Ge/Si] fuzz faces...using - or  ground [NPN] or + ground [PNP] supply.
 

[GREEN FUZ]

And use or steer right past the first one.

Yes, I should have mentioned, this configuration is the source of countless " why is my fuzz face motorboating/squealing/farting....? " posts. Sometimes it works, sometimes it doesn`t.

[mattpocket]

There are no "real" fuzz face designs that have negative ground? And the only way around it is to use another circuit to reverse polarity?

Thats a drag...

Thanks anyway! Think I will be trying something of my own design...

Matt

[petemoore]

  make an NPN neg Gnd FF...
  Axis face for instance.
  Or Ge/Si hybrid.
  Or Ge FF..
  I copped a fine tune on a hybrid NPN -gnd., that's what I'm using.

[markm]

  make an NPN neg Gnd FF...
  Axis face for instance.
  Or Ge/Si hybrid.
  Or Ge FF..
  I copped a fine tune on a hybrid NPN -gnd., that's what I'm using.

Agreed.
It's really a pretty simple operation.