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

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

 

[jimilee]

Well first, check you soldering. Your pots look like there is no solder on them. Have a look at the component side. Audio probe after that,

 

[joelorigo]

Thanks! Do you mean have a look at the component side in regards to little solder on the pots?

 

[Betty Wont]

If you have no sound in bypass, that is your priority. Is this a true bypass or buffered bypass pcb?

 

[joelorigo]

Not sure. It’s a TS10 and Klon in one PCB. The schematic will be an indication of that?

 

[benny_profane]

If you have no sound in bypass, that is your priority. Is this a true bypass or buffered bypass pcb?

Looks like the TS side is true bypass and the Klon side is buffered.

 

[joelorigo]

Looks like the TS side is true bypass and the Klon side is buffered.

I see. For my own knowledge, how did you determine that?

And how does that enter into the fact that there is no sound in bypass?

 

[Betty Wont]

And how does that enter into the fact that there is no sound in bypass?

True bypass is a simple mechanical switching scheme and requires no power to produce bypass signal. If you have no true bypass, it’s a switch issue. If you have no buffered bypass it’s more complicated because the buffer needs power to function in both modes to pass signal.

 

[joelorigo]

Got it! Thank you for that explanation.

 

[joelorigo]

So…
What should I do now?

 

[Laundryroom David]

I suggest a close visual inspection.

In/out, power; Component values, pinouts, solder joints. Voltages.

 

[Betty Wont]

Some things to consider while cleaning up. The LEDs and their unsecured leads, many pads as mentioned earlier seem unsoldered or cold, the dual gang pot needs insulation from touching the pcb and the neighboring pot pins, and there are a few questionably socketed components. Accurate pinouts and solid contacts are required, especially with round milled sockets. They are finicky and lose effectiveness with re-insertion.

 

[joelorigo]

Thanks guys, I will do/look at that stuff.

 

[joelorigo]

and there are a few questionably socketed components. Accurate pinouts and solid contacts are required, especially with round milled sockets. They are finicky and lose effectiveness with re-insertion.

Quick clarification about this topic. There's the 2SC1815 transistors and the 1n34A diodes that are socketed. I double checked the pinout and polarity on them and the seem right. Are you saying that inserting them into the sockets might not have proper connections?

 

[Laundryroom David]

Quick clarification about this topic. There's the 2SC1815 transistors and the 1n34A diodes that are socketed. I double checked the pinout and polarity on them and the seem right. Are you saying that inserting them into the sockets might not have proper connections?

Correct. Sometimes the legs of the component may not make good contact.

 

[Betty Wont]

Quick clarification about this topic. There's the 2SC1815 transistors and the 1n34A diodes that are socketed. I double checked the pinout and polarity on them and the seem right. Are you saying that inserting them into the sockets might not have proper connections?

It’s just worth checking that everything is seated properly, especially if you have it out of the box and poking around on it.

 

[joelorigo]

Hmm, and what to do to eliminate that from being an issue? I think I read on one post somewhere about applying solder to the leads to help it fit more snug. But that may have been for a diode specifically.

 

[Laundryroom David]

Hmm, and what to do to eliminate that from being an issue? I think I read on one post somewhere about applying solder to the leads to help it fit more snug. But that may have been for a diode specifically.

You can do that for diodes or transistors. I usually heatsink either when I solder them directly.

You can also kinda kink up the component legs sometimes to help them make better contact in the socket. Don’t know if that makes sense as described lol

Edited to add link about kinking up legs

Post in thread 'Sabbath Distortion issues'
https://forum.pedalpcb.com/threads/sabbath-distortion-issues.14414/post-165905

 

[joelorigo]

Oh yeah, that might be the post that I saw about tinning the leads! Thanks.

 

[joelorigo]

I have added solder to the above mentioned pots, added solder to a few other spots that maybe looked a little dogey, verified the pinouts on the transistors, and the polarity on the electrolytic capacitors and diodes, and double checked the resistors' and capacitors' values. I also changed the transistors from 2SC1815 to 2N3904 just to see if it had something to do with that. I have verified that the dual pot is floating above the board and not touching any other parts. Still no sound.
Here is the voltages I'm getting:
IC1 JRC4558
1 4.34
2 4.47
3 4.27
4 0
5 4.34
6 4.34
7 4.36
8 8.73

IC2 TL072
1 4.17
2 4.17
3 1.15
4 0
5 4.07
6 4.17
7 4.17
8 8.4

IC3 TL072
1 4.15
2 4.17
3 4.12
4 0
5 4.12
6 4.17
7 4.18
8 16.13


IC3 7660SCPAZ
1 8.4
2 4.33
3 0
4 -3.94
5 -3.78
6 3.76
7 4.78
8 8.39

Q1
C 8.84
B 3.56
E 4.33

Q2
C 8.8
B 2.54
E 2.9