fuzz face volume ?

[clamup1]

hey i built the fuzzface from this schem



the prob is that i have to turn my amp and my guitar all the way up to hear it. i play squier with passive pickups. does this matter? or did i wire something up wrong.

its wired up just like this except for i have a 3pdt switch and i did the roger mayer mods

[Bad Chizzle]

Wish I could tell from this, but I can't. I recommend the use of a signal tracer.

[clamup1]

i forgot i used ac128's. if and when i ever build one and it works right im gonna bronze the damn thing lol.  ill get some pics up. ill bet i still dont have something grounded right.

[petemoore]

  That's a partial layout, start with a PNP Neg. Gnd. schematic if using PNP's.

[G]

  That's a partial layout, start with a PNP Neg. Gnd. schematic if using PNP's.

Further to that, it has the resistors laid out for the iss. 2 board, but says it is an iss. 1 board at the top of the pic.  I've seen this pic on eBay recently.

OP; don't use that layout for anything if you have etched or bought an iss. 1 clone board.  Firstly the diagram is (supposed to be) laid out for NPN transistors, secondly it has a pretty bad mistake in those resistors' placements.  If you're working with an iss. 1 board (and PNP Ge transistors), swap the battery round, have the positive ends of the elecrolytic capacitors to the left hand side as you look at the board component side, put the 33k resistor where the 330 is in the pic, and vice versa.  The original had a 470R, not a 330R.

Hope that makes sense, and that your AC128s have survived.

[zombiwoof]

 That's a partial layout, start with a PNP Neg. Gnd. schematic if using PNP's.

Further to that, it has the resistors laid out for the iss. 2 board, but says it is an iss. 1 board at the top of the pic.  I've seen this pic on eBay recently.

OP; don't use that layout for anything if you have etched or bought an iss. 1 clone board.  Firstly the diagram is (supposed to be) laid out for NPN transistors, secondly it has a pretty bad mistake in those resistors' placements.  If you're working with an iss. 1 board (and PNP Ge transistors), swap the battery round, have the positive ends of the elecrolytic capacitors to the left hand side as you look at the board component side, put the 33k resistor where the 330 is in the pic, and vice versa.  The original had a 470R, not a 330R.

Hope that makes sense, and that your AC128s have survived.

The original germanium Fuzz Face had the 470 ohm resistor, but when they changed to NPN silicon they made that resistor 330 ohms.    Also, the relative position of the two resistors also changed, the positions were swapped.
See this page:

http://fuzzcentral.ssguitar.com/fuzzface.php

So the 330 ohm value is correct for NPN silicon trannies, and the positions of the two resistors were reversed on the original NPN silicon FF board (from the positions on the PNP germanium board), so the layout is probably correct for that version.  However, as noted, if the OP is using germanium trannies, he needs to use the values and board that were correct for those transistors.


Al

[clamup1]

i etched this myself from this:

i flipped the pic and added the values.

im not exactly getting what your saying about the bat term. but ill fix the resistors and add the 470

[zombiwoof]

i etched this myself from this:

i flipped the pic and added the values.

im not exactly getting what your saying about the bat term. but ill fix the resistors and add the 470

We both replied about the same time, but look at the page I linked to, it shows the changes in the FF when they started using silicon transistors.  You need to use the germanium circuit.

Al

[Scruffie]

Use this layout by Electric Warrior to wire it, the layout at the top is for the Silicon Transistor Version of this pedal, not AC128s.

[zombiwoof]

  That's a partial layout, start with a PNP Neg. Gnd. schematic if using PNP's.

Why would he want to use negative ground?.  The original was positive ground, and many people have had trouble when making it negative ground.   I'd stick with positive ground myself.

Al

[clamup1]

cool so ive got some stuff to move around.

[Scruffie]

cool so ive got some stuff to move around.

Don't forget you'll have to change the value of the 8k2 resistor to make it bias properly and get 4.5-5.2V on the Collector aswell.

[clamup1]

hey guys thanks for your help. i still have to turn the amp and guitar all the way up. everything else is hooked up right. it sounds even better now. is the low vol just something that goes along with the mod?
[/quote]
Don't forget you'll have to change the value of the 8k2 resistor to make it bias properly and get 4.5-5.2V on the Collector aswell.
[/quote]
i did the roger mayer mods so i guess the trannies arnt biased b/c of that?

i changed out the pos and the neg
changed the position of the two resistors
am i missing something else

[Scruffie]

No, even with the mods you still have to adjust that resistor to bias the pedal, that may explain your problem, probe it with your DMM to see what voltage you're getting on Q2s Collector and adjust appropriatley.

[petemoore]

  Worth checking out GEO tech of FF article,
  A word about transistors, Ge's don't all work out, far from it, 128's...hard to tell since there are so many types of 128's.
  So testing them is probably a good idea, and using sockets is another alternative.
  The circuit may need bias fiddled with, Q2C resistor is easier to find value for with a trimpot [I use 10k trimpot + a 4k7 stop resistor], 20k covers the range.
  Measureing the transistor voltages [Q2collector should be somewheres around 1/2v, 4.5v or so] will tell whether the circuit settling them to operational voltages on their pins.
  The voltage gain of the 2 transistor gain stage with feedback resistor is great, the output should be well above the input/bypass level.

[clamup1]

ive got the ground from the meter on the board ground and ive got nada, 0. ive never biased anything so i dont know anything.

the trannies are supposed to be right for ff. thats what the guys said anyway

[clamup1]

hey when tested it varies. one time i got 1.7 then dropped to zero. other time .7 then drop to zero. im watching a youtube vid on biasing. its pretty interesting

[G]

 That's a partial layout, start with a PNP Neg. Gnd. schematic if using PNP's.

Further to that, it has the resistors laid out for the iss. 2 board, but says it is an iss. 1 board at the top of the pic.  I've seen this pic on eBay recently.

OP; don't use that layout for anything if you have etched or bought an iss. 1 clone board.  Firstly the diagram is (supposed to be) laid out for NPN transistors, secondly it has a pretty bad mistake in those resistors' placements.  If you're working with an iss. 1 board (and PNP Ge transistors), swap the battery round, have the positive ends of the elecrolytic capacitors to the left hand side as you look at the board component side, put the 33k resistor where the 330 is in the pic, and vice versa.  The original had a 470R, not a 330R.

Hope that makes sense, and that your AC128s have survived.

The original germanium Fuzz Face had the 470 ohm resistor, but when they changed to NPN silicon they made that resistor 330 ohms.    Also, the relative position of the two resistors also changed, the positions were swapped.
See this page:

http://fuzzcentral.ssguitar.com/fuzzface.php

So the 330 ohm value is correct for NPN silicon trannies, and the positions of the two resistors were reversed on the original NPN silicon FF board (from the positions on the PNP germanium board), so the layout is probably correct for that version.  However, as noted, if the OP is using germanium trannies, he needs to use the values and board that were correct for those transistors.


Al

Yes, the 330R was moved to second down on the issue 2 board, not the issue 1.  The second transistor holes are slightly higher on the issue 2 board.  The pic in the OP says iss. 1.

They used up their remaining issue 1 boards then had a new one made up; this is when the lower (330R) was shifted.  If you follow the tracks on the board diagram above, you don't want the 330R going to supply (-9v for PNP, +9v for NPN) from the collector of Q1.

[zombiwoof]

 That's a partial layout, start with a PNP Neg. Gnd. schematic if using PNP's.

Further to that, it has the resistors laid out for the iss. 2 board, but says it is an iss. 1 board at the top of the pic.  I've seen this pic on eBay recently.

OP; don't use that layout for anything if you have etched or bought an iss. 1 clone board.  Firstly the diagram is (supposed to be) laid out for NPN transistors, secondly it has a pretty bad mistake in those resistors' placements.  If you're working with an iss. 1 board (and PNP Ge transistors), swap the battery round, have the positive ends of the elecrolytic capacitors to the left hand side as you look at the board component side, put the 33k resistor where the 330 is in the pic, and vice versa.  The original had a 470R, not a 330R.

Hope that makes sense, and that your AC128s have survived.

The original germanium Fuzz Face had the 470 ohm resistor, but when they changed to NPN silicon they made that resistor 330 ohms.    Also, the relative position of the two resistors also changed, the positions were swapped.
See this page:

http://fuzzcentral.ssguitar.com/fuzzface.php

So the 330 ohm value is correct for NPN silicon trannies, and the positions of the two resistors were reversed on the original NPN silicon FF board (from the positions on the PNP germanium board), so the layout is probably correct for that version.  However, as noted, if the OP is using germanium trannies, he needs to use the values and board that were correct for those transistors.


Al

Yes, the 330R was moved to second down on the issue 2 board, not the issue 1.  The second transistor holes are slightly higher on the issue 2 board.  The pic in the OP says iss. 1.

They used up their remaining issue 1 boards then had a new one made up; this is when the lower (330R) was shifted.  If you follow the tracks on the board diagram above, you don't want the 330R going to supply (-9v for PNP, +9v for NPN) from the collector of Q1.

Right, the problem is the board pictured is the later silicon board, not issue1 or whatever.  They show the wrong pic, you can see below it that it's for the silicon version (they list the silicon trannies).

I think there's some confusion going on because of that.  The OP is using germanium transistors, so that is the wrong layout for him.

Al

[clamup1]

cool thanks for the replies. ok now how do you hook the trim pot to Q2?