I cannot get my Fuzz Face to work

[yeeshkul]

Hello guys,
a few hours ago was my Fuzz Face pinned in a breadboard, Vc on Q2 was tuned to  4.7V and it was working absolutely flawlessly.
Then i took away all the pieces from the breadboard just to pinn them back a bit later and everything is gone. I have just spent 4 hours of testing but no success.

Here are some results:
- both transistors (Matsushitas hfe 96,100) are ok and should be working (re-measured)
- battery is like new and gives 9.55 V
- all connections are ok, no breaks
- both electrolytes are pinned ok
- transistors are pined ok

Q1:
Vb = 132 mV
Vc = 432 mV
Ve = 0 (obvious)

Q2:
Vb = 432 mV
Vc = 9.21 V (!!!)
V on the nod above the resistor in collector Q2 = 9.38V
Ve = 418 mV

I checked the setup 100 times at least, everything is ok.
Everythong seems to be perfect, just the collector voltage on Q2 is twice as much as before and it doesn't work.

Please help me ...

[yeeshkul]

Also the resistor in collector of Q2 was changed to 12k to get the right voltage ..., the rest of the pieces exactly follow schematics.

[Dragonfly]

CHECK YOUR GROUNDS ON THE FUZZ POT AND 22uF CAP....

[yeeshkul]

oh nooo ... me stupido  . i swapped the fuzz and volume pot. believe me i was close to shear insanity last night.  I just put a tag F and V on bottom of those pots just to recognise them when they are fixed on my enclosure. I did it wrong way ... oh my  

[DryRoasted]

Been there many times mate!

[R.G.]

I've been there many times as well.

This is a great illustration of some facts about humans and the way the human vision works.

Vision does not happen in the eyes - it happens in the brain. Your brain builds what I call a "world model", an internal replica of the external world around you, using data from your eyes, ears, touch, etc. What you "see" is the world image, not what your eyes input as data.

This is one reason that robotic vision is so difficult. The people who do this don't try to construct world models, perhaps because they don't know how or know intuitively that it's too difficult, and so they solve some small part of operations on the data, like edge finding, pattern matching, etc. That's useful in limited circumstances, but it never adds up to vision in the sense that humans know it.

The difference between eye-data and world model is important. If your brain decides that something is a certain way, no amount of evidence from your eyes will change what you "see" until your brain is forced by some outside circumstance or the elapsing of time to discard that preconceived notion. In the case of effects, once you feel that you're sure that you've checked it and it's all correct - except for that niggling detail that it won't work - then each re-check tends to reinforce the idea that it's correct and that somehow something else is at fault.

That's why we get, over and over, the complaint that "I must have a bad component (or the schematic must be wrong) because I've checked this a hundred times, and I know it's correct." And that's usually followed by a forehead-slapping moment when the small thing that was not "seen" is suddenly perceived.

We all do this. I *expect* it of myself because I've done it so often. It's just a new experience for a beginner.

[MartyMart]

RG , well put indeed !
More often that not, it's the most VERY BASIC mistake that'll catch you out ... been there too !!
( eg- IC NOT IN THE SOCKET !! )

MM.