Author Topic: My univox super fuzz pedal kit won't work  (Read 18875 times)

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #100 on: April 27, 2021, 06:52:06 PM »
the reason i say "i dont think im getting 9v" is 'cause the number on the MM im using goes up by itself and sometimes stays arounds the 7-9mv area.

eh la bas ma

Re: My univox super fuzz pedal kit won't work
« Reply #101 on: April 27, 2021, 07:05:38 PM »
Well, that might be the cause of your trouble. I forgot to say that the pedal needs to be connected to the battery or a 9V DC power supply and switched on, before you check the voltage on the pcb's 9V pad.

If you still don't have 9V, turn it off, unplugg all power sources, check the wiring on your DC power jack (sometimes the tip of the wires can touch each other and create a short). If it is correct, look for suspicious soldering joints that could need reflowing on your pcb ( remember transistors are heat-sensitive, you need to be quick if you apply heat around them).

Edit: if you're using a battery as power supply, test it with your MM to see if there is really 9V. The battery needs an audio jack plugged in the IN input to feed the circuit, that's why it's connected to the IN jack.

Edit 2 : On your picture I can't really see what is connected to the three DC power jack's terminals. It needs to be wired precisely as shown on the instructions.
« Last Edit: April 27, 2021, 07:52:21 PM by eh là bas ma »
"Nothing escapes the reign of cause and consequence"

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #102 on: April 27, 2021, 07:06:44 PM »
its connected to a power supply

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #103 on: April 27, 2021, 07:52:57 PM »
and i dont think any wires are shorting out on the dc jack 'cause i dont have the battery clip connected and i have a heatshrink on the lug that connects to the pcb, and i have tape covering up the pots.

eh la bas ma

Re: My univox super fuzz pedal kit won't work
« Reply #104 on: April 27, 2021, 08:17:20 PM »
This is simple : there is a red wire going fron the DC jack to the pcb 9V pad. A direct connection from your power supply to the board. If your MM can't read  9V on this pad, either you are using the wrong methode to take voltage measurements with the MM, or the wire isn't connected to the right power jack's terminal.

To read voltage you have to keep the black lead on ground first, and make a steady contact to the pcb 9V pad with the red lead. MM set on DC voltage as described in reply #88.

I think the circuit isn't properly fed with current, that's why it doesn't work yet.

"Nothing escapes the reign of cause and consequence"

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #105 on: April 27, 2021, 08:23:58 PM »
oh i think i was on AC instead of DC lol

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #106 on: April 27, 2021, 08:29:57 PM »
i just set it to DC and im still getting nothing

eh la bas ma

Re: My univox super fuzz pedal kit won't work
« Reply #107 on: April 27, 2021, 09:16:27 PM »
Was the pedal switched on with the status led activated, when you tested for 9V on the board ?
« Last Edit: April 27, 2021, 09:18:23 PM by eh là bas ma »
"Nothing escapes the reign of cause and consequence"

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #108 on: April 27, 2021, 09:19:33 PM »
yep

eh la bas ma

Re: My univox super fuzz pedal kit won't work
« Reply #109 on: April 27, 2021, 09:38:10 PM »
Did you check the DC power jack wiring to see if it is exactly connected as shown on the instructions (middle lug for the battery, outer lug for pcb 9V and square-angled lug for ground) ?

here is a clear exemple on page 4:

https://www.musikding.de/docs/basics/installationguideV001_en.pdf

An other possibility would be that the board isn't correctly connected to ground, preventing the current from coming in the pcb. On schematics, the pcb ground pad is only connected to the 3PDT footswitch. You can try to add a wire from the DC jack's ground to the board ground's pad (G).

Edit : sorry, I missed the Out jack that should already do the connection between the DC power jack GND and the pcb's GND. Just in case, you should check if every ground connections shown on the instructions is correctly wired in your build.
« Last Edit: April 27, 2021, 10:14:20 PM by eh là bas ma »
"Nothing escapes the reign of cause and consequence"

duck_arse

Re: My univox super fuzz pedal kit won't work
« Reply #110 on: April 28, 2021, 10:42:01 AM »
can you please tell us the make and model number of the multimeter you are using, and/or take a photo of the meter as you do a voltage measure, say of the +9V onboard connection?
« Last Edit: Soon at 09:27:12 by someone sensible »

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #111 on: April 28, 2021, 03:16:57 PM »



snow123

Re: My univox super fuzz pedal kit won't work
« Reply #112 on: April 28, 2021, 03:17:49 PM »
i have another one that beeps but its cooked

antonis

Re: My univox super fuzz pedal kit won't work
« Reply #113 on: April 28, 2021, 03:55:26 PM »
Black probe in COM (GND) and Red probe in place of Black one (VΩmA)..
(and voltage range selector on 20VDC)



P.S.
I'm not surprised for your cooked multimeter.. :icon_wink:
« Last Edit: April 28, 2021, 04:21:05 PM by antonis »
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

eh la bas ma

Re: My univox super fuzz pedal kit won't work
« Reply #114 on: April 28, 2021, 05:47:29 PM »
Black probe in COM (GND) and Red probe in place of Black one (VΩmA)..
(and voltage range selector on 20VDC)





Now you should be able to test for 9V on the pcb, and give us some more accurate voltage readings on your transistors's legs ?
"Nothing escapes the reign of cause and consequence"

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #115 on: April 28, 2021, 06:40:05 PM »
i got 9.2 volts now
« Last Edit: April 28, 2021, 06:51:51 PM by snow123 »

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #116 on: April 28, 2021, 06:50:24 PM »

Q1
C = 5.6
B = .7
E = .1

Q2
C= 9.2
B= 5.6
E= 5.1

Q3
C= switches between 6.1 & 6.2
B= 3.3
E= 3

Q4
C= 1.7
B= 1.8
E= 1.3

Q5
C=  1.7
B= 1.9
E= 1.3

Q6
C= 3.5
B= 1.1
E= .5

i had the DMM on 200 DCV btw

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #117 on: April 28, 2021, 06:54:32 PM »
i also had the black lead on the 9v jacks GND

eh la bas ma

Re: My univox super fuzz pedal kit won't work
« Reply #118 on: April 28, 2021, 08:10:11 PM »
According to the voltage chart on this file, looks like all your transistors are behaving correctly.

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

This should mean that everything is in order on the pcb, at least until Q6 included.

Check your soldering on your IN/Out jacks, on R30, R31 and R32, also your soldering and orientation of  C16 and C17. There is a jumper between lug 2 and 3 on the Tone pot, check if it's ok, and see if there is no mistakes with the pot's values and wiring*.

If it's allright, it's very possible that you have made a mistake with the wiring somewhere, or with the way you plugged your guitar and your amp to the pedal. An other possibility would be a short on your footswitch (although I don't notice anything suspicious on your picture).

I'm sure you know this already but I'll say it nonetheless, just to make sure : your guitar's cable goes to In (J1) and the Out jack (J2) goes to the amplifier's cable.

I think you are very close to finish this build...

*Edit : in the wiring instructions, pots are viewed from the back, the way they are when you look inside the enclosure.

« Last Edit: April 28, 2021, 09:13:20 PM by eh là bas ma »
"Nothing escapes the reign of cause and consequence"

andy-h-h

Re: My univox super fuzz pedal kit won't work
« Reply #119 on: April 29, 2021, 03:43:44 AM »
I think something is still a little weird.  ??? Base voltages higher than collector? 

Q4
C= 1.7
B= 1.8
E= 1.3

Q5
C=  1.7
B= 1.9
E= 1.3