Kliche Mini White SE No Sound

[Tovi_Port]

Hi Friends. I need help!.

I've build a few pedals before, but I can't seem to get this one to work. I have sound coming through when bypassed, but nothing when engaged. I know the first thing to check is a ground problem... I can't see or find anything. What else can it be. I've gone through all the solder joints, swapped out the IC's as well. I'll post some pictures, maybe I'm missing something stupid. The big orange cap on the is a 100v as I couldn't find anything with a smaller voltage, but from what I understand that can't be the problem? Really hoping someone can help me get this pedal going.

 

[swelchy]

Do you have a multimeter and know the pin location #'s for the IC's? If so post what voltages you have from pin 1 - 8 and label which IC the numbers are for.... This may bring a clue to what's going on with it.... Your soldering looks decent and you cleaned the board up... it's gonna come down to the charge pump being bad, dual pot grounding out on something or a resistor way off spec or wrong spot.... does your led light?

 

[Tovi_Port]

Do you have a multimeter and know the pin location #'s for the IC's? If so post what voltages you have from pin 1 - 8 and label which IC the numbers are for.... This may bring a clue to what's going on with it.... Your soldering looks decent and you cleaned the board up... it's gonna come down to the charge pump being bad, dual pot grounding out on something or a resistor way off spec or wrong spot.... does your led light?

Thank you. Yes The LED does light up. I've swapped out the Charge pump. Don't see any ground issue with the dual pot. Will experiment with the IC's and multimeter

 

[Tovi_Port]

Thank you. Yes The LED does light up. I've swapped out the Charge pump. Don't see any ground issue with the dual pot. Will experiment with the IC's and multimeter

I've measured all the pins.. This is what I get. I swapped it out for another one and got the same readings.
1
2 = -3.4
3 = 8.08
4 = 11.4
5 = 16.1
6 = 4.8
7 = 0.5
8 =

 

[swelchy]

which IC are those voltages from....? I'm wondering if you either have a bad foot switch or you flowed too much solder on the breakout board and you have a short below the board... others will chime in...

 

[Tovi_Port]

I've measured all the pins.. This is what I get. I swapped it out for another one and got the same readings.
1
2 = -3.4
3 = 8.08
4 = 11.4
5 = 16.1
6 = 4.8
7 = 0.5
8 =

Right, so I clearly did this wrong. My bad. Here are the actually readings. I just get an error on pin 3 of the Charge Pump as well as on pin 4 of Tl07 (1). Could that be the problem?


TC1044s
1 = 8
2=4.8
3=error
4=3.2
5=8
6=3.1
7=2.6
8=8

Tl072(1)
1=3.6
2=3.6
3=1
4=error
5=2.8
6=3.2
7=1.4
8=8

Tl072 (2)
1 = 5.8
2 =2.8
3 = 3.5
4= 8
5=3.5
6=5
7=8.8
8=6.4

 

[Tovi_Port]

Update. The only discrepancy with my pedal is resistor R9. I didn’t have a 2k resistor so used a 1.8k that reads 1.6k with the multimeter. Could that be the problem?

 

[swelchy]

Update. The only discrepancy with my pedal is resistor R9. I didn’t have a 2k resistor so used a 1.8k that reads 1.6k with the multimeter. Could that be the problem?

no thats not a problem at all... close enough... I was waiting to see if others chime in and see what their thoughts were...

 

[swelchy]

if you can try to get a clearer shot of your board would be helpful and I will double check your resistors against the build chart.. i can barely make out the color bands...

 

[Brett]

Check and reflow the solder joints around IC2, especially around pins 1-4. If you have sound in bypass, that pretty much rules out wiring issues because this circuit is buffered bypass. Your pictures aren't very clear, but I see several spots around IC2 that look questionable. IC2 pin 4 should have -9V continuity with ground, same with IC1 pin 4.

Edit to say that IC2 pin 4 should have -9V, I was looking at the wrong IC when reviewing the schematic.

 

[Tovi_Port]

Thanks for trying to help guys. I resoldered all the IC’s. When the pedal is engaded there is very faint sound coming through with all the potentiometers at max. Here are some better pictures

 

[BrainDrain]

I checked all your resistors and they look correct. R29 is the only one I can’t see. I don’t see anything else that stands out. One thing I’d suggest doing is making sure the resistors with brown bands on both ends are the correct values marked on the bag you got them in. It’s possible someone made a mistake and sent the wrong values because the color band was read backwards. (Mouser did this to me once) For example, a 15k resistor is brown, green, black, red, brown. A 12M is the opposite of that. Brown, red, black, green, brown. I’d just double check your stash of the values that were used for this with a multimeter.

 

[phi1]

The IC voltage are looking strange to me. Are you measuring the dc voltage compared to ground?

Where you’re showing error should just read zero volts (ground points). IC2 pin 8 should read near 18V, and pin 4 should read near -9V.


I would also look into fashioning a simple “audio probe” to follow the signal path through the pedal and find where it cuts out

 

[Erik S]

I compared your pic to the last one of these I built and found a couple resistors that look like they might not match. Grey/red/brown can all get mixed up in photos though.

Check the stripe colors on these and make sure they match the build doc.

 

[BrainDrain]

I compared your pic to the last one of these I built and found a couple resistors that look like they might not match. Grey/red/brown can all get mixed up in photos though.

Check the stripe colors on these and make sure they match the build doc.

View attachment 97163

The resistor on the top left is 12k, Brown, red, black, red, brown. Top right is 1k8 (didn’t have 2k) brown, grey, black, brown, brown. Bottom is a 1k. Brown, black, black, brown, brown. The two brown bands almost look grey but it’s probably just the light.

 

[Tovi_Port]

The IC voltage are looking strange to me. Are you measuring the dc voltage compared to ground?

Where you’re showing error should just read zero volts (ground points). IC2 pin 8 should read near 18V, and pin 4 should read near -9V.


I would also look into fashioning a simple “audio probe” to follow the signal path through the pedal and find where it cuts out

Yes that is how I’m measuring DC compared to Ground. I measured again and yes it’s way off

IC2
1=-6
2=2.9
3=3.5
4=-8
5=3.5
6=-5.2
7=-6.1
8=-6.6

 

[Tovi_Port]

The resistor on the top left is 12k, Brown, red, black, red, brown. Top right is 1k8 (didn’t have 2k) brown, grey, black, brown, brown. Bottom is a 1k. Brown, black, black, brown, brown. The two brown bands almost look grey but it’s probably just the light.

I checked all these and they are correct, When measuring with a multimeter the measurement are correct except for The 1.8k witch reads 4K, but that probably because it’s in the circuit. Colours are correct when checking with with my other 1.8k resistors

 

[phi1]

Yes that is how I’m measuring DC compared to Ground. I measured again and yes it’s way off

IC2
1=-6
2=2.9
3=3.5
4=-8
5=3.5
6=-5.2
7=-6.1
8=-6.6

Hmm I wonder if we could try to bypass the charge pump.

Remove the pump chip from the socket.

Stick a wire in the pin5 socket hole and clip it to ground.

 

[Tovi_Port]

Hmm I wonder if we could try to bypass the charge pump.

Remove the pump chip from the socket.

Stick a wire in the pin5 socket hole and clip it to ground.

And then measure again?

Also with a probe I get signal through the whole pedal, the amplitude just really drops and there seems to be no distortion applied. The only pot that works is the main output.

 

[phi1]

Yeah my idea oils basically just run IC2 on 0v - 9v (or a little less) instead of the designed -9v - 18v. Audio should work this way (checking if the charge pump chip itself is bad).

With the probe, we’re you able to find the point at which volume drops?