Fuzz face 'hair-pull'

[Luke]

Hi guys,
I have just about ripped out every hair from my head- I am still trying to de-bug my fuzzface, but to no avail.
I am now building a PNP Positive ground version- the basic one, featured at the beginging of "the techology off the fuzzface" (just the standard fuzz face)
I have checked, and double checked my components, part oriantation and soldering, all to no avail. I am getting no sound through to my amp- only a hum, which gets very loud if I touch the output socket of the circuit.
My battery is at 9.12 v, and the values for the transistors are as follows

 Q1
C= 1.89 (This should be approx .5)
B= 0.04 (This should be approx .1)
E= 0 (This is correct)

 Q2
C= 3.80 (Have wired in a 10k trim-can adjust to 8.16- [thus can get 4.5)
B= 1.89 (This should be approx .5)
E= 1.75 (This should be approx .4)

Does anyone have any suggestions? I am sure I have done everything correct? Please, any suggestions would be greatlty appreciated. Any idea where I may have made an error? (The Qs are from Small Bear, so thats not the problem- and I oriented them as per Steve's instructions [socketing them as well]).
I might go and try to solder some of my hair back in  :wink:
Take care all,
Luke

[Boofhead]

The Q2 emitter voltage looks a little high and the Q1 base voltage looks low- these are the main ones, the other voltages follow.

Check you have the transistors in the right way, particularly C and E of Q2.  Also check you have your electro caps around the right way for the PNP version - remember these are swapped compared to the NPN version.

The voltages look off so I suspect there is a problem, however, it looks like some sound should come out so perhaps check your socket and pot wiring.  If you really want to knock out some variable connect the output socket directly to the output on your PCB - make sure you turn your amp down though.

[petemoore]

For intioal debugs, I like just the ground connectionS [cords and ckt gnd], in and out from board, and battery only.
 Although in this case there is a biasing issue.
 Look around at the R color codes again and ag...I use a DMM to check that the R value is not higher sometimes for in ckt R testing...a lower value reading [of in ckt R] often shows an R value from a ckts current path around the resistor being checked, IIRC I did find problem in FF this way. You can follow the schematic to see where these paths would be. Pulling the Q's disallows some current paths. Some Ifs, ands and a couple 'buts to this method, but I use it, and I think it's good for academically, cause you have to look at the schem alot, drawing theories about current, voltage, and resistance, and then test them.

[Gringo]

Hi guys,
 Q1
C= 1.89 (This should be approx .5)
B= 0.04 (This should be approx .1)
E= 0 (This is correct)

I thought Q1 collector was supposed to be at ~1.2v.  :?

I also have a trim pot at q1 collector, i adjust q1's collector first, then i go for q2.

Hope it helps

[Luke]

Thanks guys,
I have had a bit of a break away from the circuit today- I will try your suggestions in the morning. If it still doesnt work, is there any other info I can post? voltage at each junction of the circiut? (there isnt that many, really).
thanks guys- I really appreciate it- I am sure we will get this hting going soon.
Thanks,
Luke