Low Baller
- Thread starter djmiyta
- Start date
djmiyta
Well-known member
Thank you thats the kind of info I need
Got a jumping off point now thanks again for sharing.
djmiyta
Well-known member
An update.
I audio probed the circuit in envelope mode and since I don't know I gotta ask.
I did not get any signal on either side of d2/3
No signal on either side of R11
No signal either side of C5.
I've got continuity on both sides of the switch
ok so I flip the switch to dist/fuzz I have signal on one lug on the switch (the lug I'd expect signal on) but no signal on the switch middle lug and still no signal on any of D2/3 , R11 or C5
No signal on D2/3 R11 and C5 when not in dist mode I kinda understand but obviously I've got no signal going into the distortin pathway? I'm thinking that's to be expected being of the distortion side. Am I correct?
So now I'm stuck.
When it was boxed there were a couple times I'd switch to the distortion just to see and there'd be a faint high pitched whistle that when switched back to just envelope it would be there too but really faint with a little extra white noise added in the effect still worked (but I don't think to it's full potential) Switching it a couple of times would remove it from the envelope side. Maybe the switch is bad? even if it shows correct continuity?
In distortion mode I get signal on lugs 2 & 3 of the sens pot which serves as the volume pot for the fuzz. As I turn the sens pot CW the signal increases on lug 2 of the sens pot. As it should (I assume}. lug 3 sounds so much brighter than 2 (better to my ears).
nnno clue now what to do with this info or where to go from here
ANY help, getting this to work at a 100%, will automatically get you much deserved appreciation. Some of you may not necessarily need that but I appreciate appreciation .........so......... THANKS PEDALPCB FORUM PEOPLE for all the good times and help. Hope we can do this one. more. time.
I audio probed the circuit in envelope mode and since I don't know I gotta ask.
I did not get any signal on either side of d2/3
No signal on either side of R11
No signal either side of C5.
I've got continuity on both sides of the switch
ok so I flip the switch to dist/fuzz I have signal on one lug on the switch (the lug I'd expect signal on) but no signal on the switch middle lug and still no signal on any of D2/3 , R11 or C5
No signal on D2/3 R11 and C5 when not in dist mode I kinda understand but obviously I've got no signal going into the distortin pathway? I'm thinking that's to be expected being of the distortion side. Am I correct?
So now I'm stuck.
When it was boxed there were a couple times I'd switch to the distortion just to see and there'd be a faint high pitched whistle that when switched back to just envelope it would be there too but really faint with a little extra white noise added in the effect still worked (but I don't think to it's full potential) Switching it a couple of times would remove it from the envelope side. Maybe the switch is bad? even if it shows correct continuity?
In distortion mode I get signal on lugs 2 & 3 of the sens pot which serves as the volume pot for the fuzz. As I turn the sens pot CW the signal increases on lug 2 of the sens pot. As it should (I assume}. lug 3 sounds so much brighter than 2 (better to my ears).
nnno clue now what to do with this info or where to go from here
ANY help, getting this to work at a 100%, will automatically get you much deserved appreciation. Some of you may not necessarily need that but I appreciate appreciation .........so......... THANKS PEDALPCB FORUM PEOPLE for all the good times and help. Hope we can do this one. more. time.
DGWVI
Well-known member
Would it be possible to see some hi res photos of both sides of the board? Having the visuals will help us see if there are any parts or damages that need to be addressed
But it still sounds like your issue lies somewhere between pin 7 of IC1 and the toggle switch
You'd still have signal at those junctions regardless of switch position in a working circuit, as the Distortion is generated from the peak detector which is always connected to the input. The switch just chooses whether the guitar gets sent directly to the filters or makes a detour though the peak detector for clipping. Essentially, it chooses the output not the input
The Sens pot is wired as a voltage divider, the same as any typical volume pot would be. Here it acts to control the amount of guitar driving the peak detector and the amount of distortion when switched to that mode. So, lug 3 should be the loudest and brightest as it's basically taking the signal directly from the input buffer. While lug 2 is the wiper and it's loudness will be dependent on the position of the Sens pot.
But it still sounds like your issue lies somewhere between pin 7 of IC1 and the toggle switch
You'd still have signal at those junctions regardless of switch position in a working circuit, as the Distortion is generated from the peak detector which is always connected to the input. The switch just chooses whether the guitar gets sent directly to the filters or makes a detour though the peak detector for clipping. Essentially, it chooses the output not the input
The Sens pot is wired as a voltage divider, the same as any typical volume pot would be. Here it acts to control the amount of guitar driving the peak detector and the amount of distortion when switched to that mode. So, lug 3 should be the loudest and brightest as it's basically taking the signal directly from the input buffer. While lug 2 is the wiper and it's loudness will be dependent on the position of the Sens pot.
djmiyta
Well-known member
In distortion mode I get signal on lugs 2 & 3 of the sens pot which serves as the volume pot for the fuzz. As I turn the sens pot CW the signal increases on lug 2 of the sens pot. As it should (I assume}. lug 3 sounds so much brighter than 2 (better to my ears).
nnno clue now what to do with this info or where to go from here.
I should add that in distortion mode although there is signal at the sens pot I still get no signal at the output jack.
You'd still have signal at those junctions regardless of switch position in a working circuit, as the Distortion is generated from the peak detector which is always connected to the input. The switch just chooses whether the guitar gets sent directly to the filters or makes a detour though the peak detector for clipping. Essentially, it chooses the output not the input.
So since I should always have signal at those points it's time to do more audio probing? Probing areas before the distortion section (cause it doesnt look like there is a lot there to probe. Some reason I keep going back to the switch maybe I got it to hot when I soldered it I would have already swapped it out if I had another but I've only a DPDT on/on. Maybe I'll try that but I don't think the switch has anything to do with the faint whistling I hear.
I'll get some pics up as soon as I can. Thanks for the help
nnno clue now what to do with this info or where to go from here.
I should add that in distortion mode although there is signal at the sens pot I still get no signal at the output jack.
You'd still have signal at those junctions regardless of switch position in a working circuit, as the Distortion is generated from the peak detector which is always connected to the input. The switch just chooses whether the guitar gets sent directly to the filters or makes a detour though the peak detector for clipping. Essentially, it chooses the output not the input.
So since I should always have signal at those points it's time to do more audio probing? Probing areas before the distortion section (cause it doesnt look like there is a lot there to probe. Some reason I keep going back to the switch maybe I got it to hot when I soldered it I would have already swapped it out if I had another but I've only a DPDT on/on. Maybe I'll try that but I don't think the switch has anything to do with the faint whistling I hear.
I'll get some pics up as soon as I can. Thanks for the help
djmiyta
Well-known member
ok so the switch wasnt the problem although the faint whistle is gone. Its dead quiet which it wasn't before. checking envelope side against demos and seems that properly working ones have much more obvious "envelopeing" happening than mine. My first thought is Ive got a wrong value in there somewhere
DGWVI
Well-known member
Are you able to get close to the demos you're watching with the the attack knob at zero and the decay pot around halfway? That will approximate the stock Bassballs settings. The bass and treble pots should be set slightly off from eachother
So, it sounds like you need to take a look at R5, as that's setting the gain of the peak detector/ clipper of IC1.
We can ignore pin 5 of IC1 in regard to audio signal, as that just goes to ground as part of the ICs bias network.
