Fuzz Face Transistor Problem

[Kelzorz]

I have build a simple fuzz face circuit, albeit with 3906's, and it seams to work fine, except that my second transistor has no output on the collector.  any advice would be appreciated. 



schematic: http://fuzzcentral.ssguitar.com/fuzzface/fuzzfacepnpschematic.gif

[petemoore]

  Quick way to start and finish debugging is read the debugging sticky.
  battery voltage, schematic, everything else.
  PNP Pos. Gnd. like you have going is a good, workable circuit.
  When there's anything in the physical manifestation that differs from the schematic, the DMM can be applied in various ways/settings to ferret it out...pin voltages etc.
  One stage, output boost/fuz will tell when it's working, problem can be with the switching.
  Where the lines 'pass through' the switch...those two lugs should connect [hit switch to verify which pairs of switch lugs connect...
  Study DPDT...which is 2x simultaneously activated SPST.
  FF article at GEO, Q2CR does well instead of a fixed resistor, as trimpot for starts with Fuzzfaces. 20k covers the bias-range-resistance of FF transistors.

[smallbearelec]

What does "no output" mean? If you aren't getting sound at all, it's not "working fine." Please be a little more specific in describing what you hear/don't hear, from where, under what conditions, etc.

[Kelzorz]

sorry i was rushed to get off my computer when i was posting that.

so heres teh problem:
i was breadboarding this (I'm not a newcommer to electronics). I followed the scematic to the letter, there was no signal at the collecter of teh second transistor, I checked for all the standerd stuff, no gnd, pwr, resistor connections, etc. and it all came back good. the issue is that there is simply no signal at the collector of the second transistor. im not using germaniums so im wondering if that has somthing to do with it (no leakage and all).

[smallbearelec]

Are you taking your output directly from the Collector, or from the .01 mf. capacitor? What are the voltages at C, B and E.

I breadboarded this with NPN devices.

http://www.smallbearelec.com/HowTos/BreadboardSiFF/BreadboardSiFF.htm

My notes on biasing might help. Also note at the end of this article:

http://www.smallbearelec.com/Projects/FurFace/FurFace.htm

the list of expected voltages.

The 2N3906 is a fairly high gain part, so I would expect that some tweaking of the bias would be needed to get it to sound "right." But no sound at all is unusual.

[Kelzorz]

I know right, BTW I am an electronics graduate so I know what a breadboard is and everything, I know for a fact that the transistors are good and correctly biased. its just, they don't work, it is a problem specific the the fuzz face these transistors worked perfectly in another circuit i was using them in a while ago.  ive also checked the other components (caps not the issue) and the resistors are whiten tolerance.