SOLVED Kentauride No Sound

[joelorigo]

I have an Effects Layouts Kentauride that I have finished but there is so sound in either bypass or effects. This is the first time I've had this specific issue; could someone tell me what is the first thing to do? (Photos included)

Bellow are links to the project and the build doc.

KENTAURIDE – Effects Layouts

effectslayouts.com

http://effectslayouts.com/wp-content/uploads/2021/12/Kentauride-build-doc-v2.pdf

 

[jhaneyzz]

Any chance the PCB on the footswitch is upside down? I soldered one onto the wrong side of a board once and that didn't work.

 

[joelorigo]

Any chance the PCB on the footswitch is upside down? I soldered one onto the wrong side of a board once and that didn't work.

Interesting that you ask that. I don't think it's upside down. The numbers on it are matched up with the numbers on the main PCB. And the way I have it matches this photo from this previous successful build:

EffectsLayouts Kentauride

Another 2-in-1 from EffectsLayouts. This one is a TS10/Klon. For the Klon side I used old 1N34a diodes from stompboxparts.com. They measured a bit all over the place, but I did find two relatively close to the target Vf of .350V on my DCA55. Sounds great! The combination was obviously inspired...

forum.pedalpcb.com

However, I did have it upside down first. So I solder sucked all the solder off, removed it and re-soldered it in the correct orientation. Is it possible one of the pads got messed up? The continuity for on and off are correct though. Also, these footswitch PCBs are a tight fit compared to the PedalPCB ones.

 

[joelorigo]

Two things

We have a ground bridge somewhere

1. solder connections on the jack
2. Input pad
3. solder bridge between input positive and input ground
4. Solder bridge between output positive and output ground

I don't see any solder bridges on either side of the PCB for the input "S" & "T" pads or output "S" & "T" pads. The connections on the jacks seem ok. I think. I am getting continuity between the "T" pads and the jack tips and the "S" pads and the jack sleeves on both input and output..

 

[jimilee]

Interesting that you ask that. I don't think it's upside down. The numbers on it are matched up with the numbers on the main PCB. And the way I have it matches this photo from this previous successful build:

EffectsLayouts Kentauride

Another 2-in-1 from EffectsLayouts. This one is a TS10/Klon. For the Klon side I used old 1N34a diodes from stompboxparts.com. They measured a bit all over the place, but I did find two relatively close to the target Vf of .350V on my DCA55. Sounds great! The combination was obviously inspired...

forum.pedalpcb.com

However, I did have it upside down first. So I solder sucked all the solder off, removed it and re-soldered it in the correct orientation. Is it possible one of the pads got messed up? The continuity for on and off are correct though. Also, these footswitch PCBs are a tight fit compared to the PedalPCB ones.

You may have o er heated the switch causing an internal short. In one position pins 1-4-7 should have continuity with the row below it, and the bottom row should have continuity with the middle row.

 

[jhaneyzz]

You may have o er heated the switch causing an internal short. In one position pins 1-4-7 should have continuity with the row below it, and the bottom row should have continuity with the middle row.

I agree with jimilee here. I've done the same more than once.

 

[joelorigo]

Looks like we're on to something. In the on position (LED is lit), there is continuity with the top row (1-4-7) and the row below (2-5-8). In bypass, there is continuity with the bottom row (3-6-9) and the row above (2-5-8), which I believe is normal.

BUT ALSO in bypass pins 7 & 8 have continuity. That's not normal, right?

And I don't know if this means anything but in bypass touching 4 & 5 makes the LED light up.

 

[jimilee]

Looks like we're on to something. In the on position (LED is lit), there is continuity with the top row (1-4-7) and the row below (2-5-8). In bypass, there is continuity with the bottom row (3-6-9) and the row above (2-5-8), which I believe is normal.

BUT ALSO in bypass pins 7 & 8 have continuity. That's not normal, right?

And I don't know if this means anything but in bypass touching 4 & 5 makes the LED light up.

You’re right. 7,8,9 should not hav continuity all at the same time, here is a pic of stomp board wiring and what each lug is doing.

 

[joelorigo]

Thanks for that, good to know. I will replace the footswitch and report back.

 

[jimilee]

Thanks for that, good to know. I will replace the footswitch and report back.

Do you have a test rig that can be used after removing the footswitch?

 

[joelorigo]

I don't. What exactly is a test rig?

 

[KR Sound]

I don't. What exactly is a test rig?

Something like this is really nice to use:

Auditorium Test Platform - PedalPCB.com

Pedal testing platform

www.pedalpcb.com

 

[joelorigo]

Ah ha! So the idea is you can test the soldering right away, knowing if you have a problem before wiring/assembly in the enclosure?

 

[jimilee]

Ah ha! So the idea is you can test the soldering right away, knowing if you have a problem before wiring/assembly in the enclosure?

Yep, makes trouble shooting easier and removes extra variables. Every builder should have one. Mine came from jmkpcbs before I found this place. I had one for 10 years before that, but I needed something with an audio probe.

 

[joelorigo]

Coo, makes sense. I will order it. Thanks!

For anyone: Do you guys use it for every build, or just when there is an issue?

 

[Harry Klippton]

I test every build once the board is populated and before doing any off board wiring but I just use a breadboard

 

[joelorigo]

I replaced the footswitch in question and I get signal in bypass! Thanks guys!

However, the TS side doesn't have any signal when activated. The Klon side works.

Since I have visually inspected this thing quite bit already and verified the component values, should I go to audio probing?

 

[JamieJ]

@joelorigo - I would start from scratch with the TS now the klon is working. I’d check op amps have the correct voltage and then Audio probe.

 

[jimilee]

I replaced the footswitch in question and I get signal in bypass! Thanks guys!

However, the TS side doesn't have any signal when activated. The Klon side works.

Since I have visually inspected this thing quite bit already and verified the component values, should I go to audio probing?

Yessir

 

[joelorigo]

Anything in these numbers look wonky?

Here's what I'm getting:

IC1 JRC4558
1 4.33
2 4.46
3 4.25
4 0
5 4.33
6 4.33
7 4.33
8 8.71

IC2 TL072
1 4.16
2 4.16
3 1.27
4 0
5 4.06
6 4.17
7 4.16
8 8.38

IC3 TL072
1 4.15
2 4.16
3 4.11
4 0
5 4.11
6 4.16
7 4.17
8 16.07

IC3 7660SCPAZ
1 8.37
2 4.32
3 0
4 -3.93
5 -3.77
6 3.75
7 3.8
8 8.37

Q1 2SC1815
E 2.82
C 8.7
B 2.48

Q2 2SC1815
E 4.21
C 8.7
B 3.48

 

[joelorigo]

Also, I got the audio probe out and I am still not getting anything at R1. Getting signal at the IN pad. Since that is the first component in the schematic, there should be signal at R1, correct?