Author Topic: My univox super fuzz pedal kit won't work (Read 19469 times)

snow123 · « **Reply #200 on:** May 04, 2021, 12:44:22 PM »

i think i want to keep working on this lol

snow123 · « **Reply #201 on:** May 04, 2021, 12:45:13 PM »

so if i cant get anything when probing a certain part, does that mean somethings wrong?

snow123 · « **Reply #202 on:** May 04, 2021, 12:46:22 PM »

i should have also mentioned that i can get my dry signal through when probing about 5 out of the 9 lugs on the footswitch

eh la bas ma · « **Reply #203 on:** May 04, 2021, 01:05:42 PM »

I am not very experienced with following a signal with a probe.

I think the purpose of the exercise is to follow the signal on the circuit, untill you find the spot where there is a problem (meaning the signal stops going forward). In order to do that, I think we have to start from the input of the pedal, all the way to the output, following the schematics carefully. The document you have to use is the one which has been kindly provided by Antonis on reply #91 page 5 :

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

I recommend to use an old amplifier at low volume to probe the signal, because there will be a lot of noises. Loud popping noises aren't good for either your ears and your amp's speakers.

snow123 · « **Reply #204 on:** May 04, 2021, 01:44:27 PM »

well i dont have any old or cheap small amps. the only other amp i have in my house is my dads old 10" rickenbacker combo amp.

antonis · « **Reply #205 on:** May 04, 2021, 02:02:00 PM »

Signal path (with relative amplitudes & phase) for audio probing..

snow123 · « **Reply #206 on:** May 04, 2021, 02:20:49 PM »

btw im building the modded one with the clipping trimpot and tone knob instead of tone switch so im pretty sure this is the schematic i need:

antonis · « **Reply #207 on:** May 04, 2021, 03:04:07 PM »

It makes no difference for signal tracing..

snow123 · « **Reply #208 on:** May 04, 2021, 05:04:36 PM »

wait are things that are grounded not supposed make any noise when probed?

antonis · « **Reply #209 on:** May 04, 2021, 05:33:30 PM »

I've to admit I'm not sure about "grounded" items anymore..

One side DC grounded resistive items, like R33, R3, R5, R7 and so, are also AC grounded there so there should be "some" voltage difference on their other side..
One side DC grounded reactive items, like C2, C10 & C13 are also AC grounded on their other side so there shouldn't be any voltage difference (almost) between their sides..

That said, there should be audio signal between R3 upper leg & GND but no signal between C10 possitive leg and GND..

snow123 · « **Reply #210 on:** May 04, 2021, 05:40:30 PM »

grounded as in connected to ground

snow123 · « **Reply #211 on:** May 04, 2021, 11:36:05 PM »

well i tried improving the solder joints and everything is making popping noises.

antonis · « **Reply #212 on:** May 05, 2021, 03:29:11 AM »

Didi you resolder PCB with power on..??

bluebunny · « **Reply #213 on:** May 05, 2021, 03:30:46 AM »

Quote from: snow123 on May 04, 2021, 05:04:36 PM

are things that are grounded not supposed make any noise when probed?

No. The other end of your probe is also ground (I hope), so you can't possibly expect any voltage difference between the probe ends, so no sound.

snow123 · « **Reply #214 on:** May 05, 2021, 12:49:13 PM »

Quote from: antonis on May 05, 2021, 03:29:11 AM

Didi you resolder PCB with power on..??

no

snow123 · « **Reply #215 on:** May 05, 2021, 03:10:17 PM »

Here's my soldering btw

snow123 · « **Reply #216 on:** May 05, 2021, 03:15:19 PM »

i did fill in all of the empty holes with some solder to make sure everything there was connected

snow123 · « **Reply #217 on:** May 05, 2021, 03:24:32 PM »

omg im an idiot. i just realized 2 of the legs on q2 are soldered together LMAO

snow123 · « **Reply #218 on:** May 05, 2021, 03:52:08 PM »

lol the poppings been fixed

snow123 · « **Reply #219 on:** May 05, 2021, 04:30:01 PM »

i made a diagram thing of things that did and did not make noise when probed.
green = makes noise when probed
red = does not make noise when probed or lets through a very quiet or weak signal.

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Author Topic: My univox super fuzz pedal kit won't work (Read 19469 times)