Fuzz Face problems

[jflam]

Somebody, anybody help me.  I've been working on the JH-2 project for weeks now and I have absolutely no idea why this circuit does not work.  I've debugged it numerous times.  I cannot find anything wrong.  My values for the transistors are as follows"

Q1:C -2.41; B -1.79; E -0
Q2:C -2.98; B -2.38; E -.521

These values seem reasonable for me, but i don't truely know (i'm very new to this).  If there is something peculiar to this pedal that i'm overlooking/overstepping, someone please tell me.

[petemoore]

You'll be able to swap transistors [FF's like to taste tranny's IMO],
If you put a trimpot on Q2...
Try changeing the value of Q2's collector to get it's Voltage reading closer to 4.5-v [replace it witha pot]

[jflam]

do i want the pot replacing the transister to be 10k?  Also, is 4.5 volts the standerd value for transister collecters, or is there a specific formula that produces an optimum voltage mathematically?

[petemoore]

since you have a 10k if you add a 4k7 to it and splice it where Q2's resistor was you'll get about between 4k7 and 14k7 variable resistance there...this made it easy for me to dial in by ear the sound within 'acceptable' bias range of between 4.5v and 6v at Q2's C.
  Tie the wiper of the pot to one side lug...or not...something about noise I read once
 Look at schemaatics that have bias pots like this [right 'above' a transistor...Rocket has example of this.

[javacody]

I had some misbehaving Germanium Transistors myself and did the very thing that petemoore recommended to you and it worked like a charm, and is about the best advice you can give to someone building their first FF.

JFlam, you said:

do i want the pot replacing the transister to be 10k?

You meant resistor, here, right?

[jflam]

not transister  :? ....resister!

[dan]

hi, i'm new to all of this, and the fuzz face will be my first stomp box. i ordered the parts from small bear. i got a neat breadboard for christmas that has a built in dpdt, led's, spst's, pots, etc. i made the circuit, wired everything together, and tested it. the results are that when the dpdt is switched in one position it playes clean (i'm using true bypass) and in the other position no sound at all comes out. i've been messing with it for about 2 days now and i've tried every debuging thing i can think off. my question is: is there anyother debugging procedures i can do? thanks.

[dan]

hi, i'm new to all of this, and the fuzz face will be my first stomp box. i ordered the parts from small bear. i got a neat breadboard for christmas that has a built in dpdt, led's, spst's, pots, etc. i made the circuit, wired everything together, and tested it. the results are that when the dpdt is switched in one position it playes clean (i'm using true bypass) and in the other position no sound at all comes out. i've been messing with it for about 2 days now and i've tried every debuging thing i can think off. my question is: is there anyother debugging procedures i can do? thanks.

[dan]

hi, i'm new to all of this, and the fuzz face will be my first stomp box. i ordered the parts from small bear. i got a neat breadboard for christmas that has a built in dpdt, led's, spst's, pots, etc. i made the circuit, wired everything together, and tested it. the results are that when the dpdt is switched in one position it playes clean (i'm using true bypass) and in the other position no sound at all comes out. i've been messing with it for about 2 days now and i've tried every debuging thing i can think off. my question is: is there anyother debugging procedures i can do? thanks.

[Gus]

What schematic did you use?  NPN or PNP transistors?  Si or GE?

[petemoore]

I always debug the ckt before any bypass switching or jjacks get introduced into the equation...

[dan]

sorry, i fixed it now. the problem lied in the the way i had the transistors wired up to the rest of the circuit. i was confused but i looked it up and fixed it, works now.

edit: i'm using PNP ristores if your still wondering.