My univox super fuzz pedal kit won't work

[eh la bas ma]

Did you do something about the possible short I saw on your picture ?

If so, it's time for voltage readings :

"Now, using the original schematic as a reference for which part is which (that is, which transistor is Q1, Q2, etc. and which IC is IC1, IC2, C1, and so on) measure and list the voltage on each pin of every transistor and IC. Just keep the black lead on ground, and touch the pointed end of the red probe to each one in turn. Report the voltages as follows:

Q1
C =
B =
E =

Q2
C=
B=
E= "

[snow123]

ye i did do something about that short

[snow123]

so do i have to solder on the top to test the ground?

[snow123]

Did you do something about the possible short I saw on your picture ?

If so, it's time for voltage readings :

"Now, using the original schematic as a reference for which part is which (that is, which transistor is Q1, Q2, etc. and which IC is IC1, IC2, C1, and so on) measure and list the voltage on each pin of every transistor and IC. Just keep the black lead on ground, and touch the pointed end of the red probe to each one in turn. Report the voltages as follows:

Q1
C = 001
B = 001
E = 001

Q2
C= 001
B= 001
E= 001

[andy-h-h]

Voltages should be somewhere in this area

https://www.circuitlab.com/circuit/282u75p484h6/univox-superfuzz/

[eh la bas ma]

so do i have to solder on the top to test the ground?

You don't need to solder anything to take measurements with the multimeter.
You don't need to test the ground : the black lead is always connected to ground, any ground, like jack's GND or DC power jack's GND, without soldering it. The red lead is in contact with one transistor's leg at a time, in order to read its voltage with the multimeter. The circuit should be connected to 9V power supply, to have some voltage in the transistors.

[snow123]

Q1
C = .947
B = .932
E = .978

Q2
C= .936
B= .937
E= .940

[snow123]

and some of my readings were quite inconsistent so i checked continuity and the probes are grounded to the pcb

[eh la bas ma]

I would check if there is 9V coming on the board (black lead on ground and red on 9V pad) :


I don't understand why you left C3 and C15 empty. Your schematics don't mention anything about it.

If you think it's ok to leave them empty, you can try to put a jumper at C3 (connect both empty pads with a short wire that you can easily remove), if there is no change, try to put one at C15, if still nothing changes, try to put jumpers at both C3 and C15.

If it's still doesn't work, I would try to remove Q1 and see if there is some voltage at these pads. If there is, try to turn it around, in case it is oriented the wrong way.

Edit : to test voltage you need to set your multimeter on position marked "6" on this picture (DC voltage)

[snow123]

GGG said that c3 and c15 arent needed (on the mod info page for the kit:http://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdfhttp://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdf) and i didnt have the right cap for c3 so i just removed c15 aswell.

[eh la bas ma]

GGG said that c3 and c15 arent needed (on the mod info page for the kit:http://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdfhttp://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdf) and i didnt have the right cap for c3 so i just removed c15 aswell.

Sorry but your link gives me a "No Results Found"

Edit: I've found this : http://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdf

Looks like you are right, and there is no jumper on their picture.

[antonis]

C15 is a Q6 Collector-Base feedback cap (Miller) so better left "open" than shorted via jumper..

http://generalguitargadgets.com/pdf/ggg_superfuzz_sc.pdf

[eh la bas ma]

I think i might have spotted something : on the picture in exemple here : http://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdf

there is a jumper near D2 (marked "a / b "). Looks like on your build these pads are empty... I'm not quite sure about this but it might worth the try.

Edit : I don't see these mysterious pads on the picture shown here, but there is a chart of voltages that you can use, I guess.

http://generalguitargadgets.com/pdf/ggg_superfuzz_instruct.pdf

[snow123]

I think i might have spotted something : on the picture in exemple here : http://generalguitargadgets.com/pdf/ggg_superfuzz_mods.pdf

there is a jumper near D2 (marked "a / b "). Looks like on your build these pads are empty... I'm not quite sure about this but it might worth the try.

nah i do have the jumper there, its just kinda hard to see

[eh la bas ma]

Looking at your schematics, at your build and at this picture, considering that you said in reply #68 that you are using p2n2222a :



schems:
http://generalguitargadgets.com/pdf/ggg_superfuzz_lo_mods.pdf





I think your transistors are the wrong  way around...

[snow123]

Looking at your schematics, at your build and at this picture, considering that you said in reply #68 that you are using p2n2222a :



schems:
http://generalguitargadgets.com/pdf/ggg_superfuzz_lo_mods.pdf





I think your transistors are the wrong  way around...

the kit came with p2n2222a's but im using regular 2n2222a's.

[eh la bas ma]

Looks like the pcb layout isn't the same as the schematics from your first post. One way to make sure they are oriented right is to test Q1 :

Q1's Collector should ring with R4 with your multimeter on continuity mod. If it does, then there is no doubt about transistors orientation anymore.

[snow123]

yep it beeps when doing that

[eh la bas ma]

Do you read 9V with your multimeter on the pcb 9V pad ?

[snow123]

i dont think im getting 9v on the Multimeter but the multimeter does make the led and stuff flicker