god this silicon fuzz face is driving me insane! even after hours of research!

[petemoore]

Q1
E - 0.0v
B - .56v
*C - 1.21v

Q2
E - .64v
*B - .89v
C - 4.43
  Q1C and Q2B are supposed to be connected.

[ode2no1]

ok here's the update. i put a 1k trimmer between the emitter of Q2 and the fuzz pot to dial out the oscillation (which ends up going away at about 16.5 ohms). i'm not quite sure what i'm going to do yet as i actually really like the high gain sound and as long as the fuzz pot is either turned a hair below max or the volume knob is at 3 o'clock everything is cool. i like the cleanup sound of the pedal a lot more without the added resistor, but i'm not sure if there is enough volume for a boost with the volume knob down. so i'm on my way to my rehearsal studio to give it a go with my real amps and tweak the trim pot and see if i want to live with the oscillation thing or tame it internally. thanks so much for everyone's help. i don't know what the deal was with that first layout. i mean it's entirely possible that i made a mistake, but i can't really see that being it just because it's so simple. then again everyone screws up the easiest things sometimes. i'm bringing some different transistors along too just for fun . thanks again!

[rousejeremy]

Have you had feedback problems with other pedals? Do you think maybe you have microphonic pickups?

[Gus]

The layout of the wires and the wire lengths can be a part of the trouble.
Simple rules that sometimes help
keep the wires from the board short.
wires that run next to each other have more coupling between them than wires that run at 90 degrees

[ode2no1]

no it's just this one pedal. check this out though guys...can someone explain this? i was messing around with the pedal thru my deluxe reverb just a bit ago and with the volume knob up to the point that the pedal oscillates it cancels out my amps reverb!! i was like what the hell? turned it down a hair and the reverb is back. it doesn't really matter to me because with the volume down a bit it's still a little louder than my Ge version, but i thought that was nuts. also, i decided to remove the trim pot and deal with the oscillation because i like the way it sounds more and not maxing out the volume so it won't freak out isn't a bit deal. i ended up with 2 bc109's because i allowed me to turn the volume up higher before oscillation than using a 108 for Q1. i love the tone of this thing.

[The French connection]

Can we see a nice resolution picture of the guts...of your pedal for sure.

Dan

[ode2no1]

hahaha well...it's a bit messy looking now that i've had to mess with it so much so i was thinking about just building it up again for the third time so things will be nice and neat. it would be a bit embarrassing to post amongst such experienced builders.

[The French connection]

hahaha well...it's a bit messy looking now that i've had to mess with it so much so i was thinking about just building it up again for the third time so things will be nice and neat.

We've all made rat nest at a certain point. It's part of the learning processus and good working method. 

it would be a bit embarrassing to post amongst such experienced builders.

No shame at all! That's why i ask you because some people (more experience than me...) can point out some error and give you usefull advices or anything else. There's some people who answered you actually that can share a lot of experience with you. That's the beauty of this forum.

Dan

[petemoore]

Q1
E - 0.0v
B - .56v
*C - 1.21v

Q2
E - .64v
*B - .89v
C - 4.43
  Q1C and Q2B are supposed to be connected.
  Edit: Either the measurements are incorrect or the circuit isn't wired correctly.

[Gus]

http://www.diystompboxes.com/pedals/gusFuzzFace.gif

Aron what was the date this was first available at you site?

Note Q1 open loop gain is controlled and edge filter(1K .01uf) and the bias control. The bias control it is not a hack but an external control for different sounds one can make it a fixed resistor adjusted for taste.

Use NPNs  2n2222a 2n3904, 2n5088, BC,s 2SCs... mix numbers, have fun.