Kliché Mini Noob Issues

[Gsatterw]

Hey guys - 2nd pedal build here and having a pretty bizarre issue - getting no difference with pedal 'on' vs 'off' - both are just my completely dry signal. LED works with switch. Checked continuity on the footswitch and that checks out. All 3 knobs do nothing with the LED on, or off. No change in volume, gain or tone. I've checked voltages at all 3 IC's and they are comparable within 0.3v of what others have posted. I did have all 3 installed backwards initially. Also had the LED backwards initially. My solders are certainly amateur. Hoping someone can point me in the right direction here. Many thanks in advance!

 

[Gsatterw]

R14 appears to be a 150KΩ instead of 15KΩ..could be the picture though (looks a bit o-range)

Yea colors didn't come out great. it is red, so 15k.

 

[Gsatterw]

I think you will have better luck boxing it with the footswitch in the proper orientation. I would fix that before doing anything else, especially since it seems likely to be a switching issue.

It goes into the box the same as it would otherwise. That mini pcb is symmetric so it functions the same either way...I've thought about that one a lot...i have been known to be dumb before though. The continuity checked out on the footswitch though. 1/2 and 4/5, 2/3 and 5/6 go together.

 

[EGRENIER]

Yea colors didn't come out great. it is red, so 15k.

Did you check your ceramic cap values ? C8 and C14 ?

 

[Gsatterw]

Did you check your ceramic cap values ? C8 and C14 ?

They are stamped 391 and 821 so those should be good.

 

[fig]

Were the voltages measured before or after correcting the orientation?

 

[Gsatterw]

Were the voltages measured before or after correcting the orientation?

After.

More info: first off, audio probes are the coolest thing ever. After poking around for a while the biggest things that stand out to me are I have no signal on the nodes going into pin 2 or 6 of IC2 with the gain all the way up. With the gain all the way down I get nothing on pin 6 and the slightest, and I mean ever so barely audible signal on pin 2. Not sure if this is normal or not. Also with the gain all the way up I figured I'd get more gain off of pin 7 of IC1...any gain really. Sounds like my dry signal.

What does it all mean?

 

[Gsatterw]

May as well post my IC voltages:

IC1
1. 4.53
2. 4.53
3. 3.54 (always starts higher and drops?)
4. 0
5. 4.52
6. 4.53
7. 4.55
8. 9.04

IC2
1. 4.52
2. 4.52
3. 4.52
4. -8.59
5. 4.53
6. 4.53
7. 4.54
8. 16.23

IC3
1. 9.04
2. 4.72
3. 0
4. -4.13
5. -8.59
6. 4.51
7. 5.77
8. 9.04

 

[Gsatterw]

If I'm getting the correct voltages, does it mean that my op amps are good? Or is it possible that they are junk despite having all of the correct voltages?

 

[Gsatterw]

Can anyone confirm that I should be hearing signal from pins 2 and 6 of IC2? I've been trying to study up on op amps, but can't find this specific answer anywhere. My gut is that I should be hearing something.

 

[EGRENIER]

Can anyone confirm that I should be hearing signal from pins 2 and 6 of IC2? I've been trying to study up on op amps, but can't find this specific answer anywhere. My gut is that I should be hearing something.

From the schematic, you should be getting sound on IC1 and IC2 pins 1, 3, 5 and 7 for sure.

 

[Gsatterw]

From the schematic, you should be getting sound on IC1 and IC2 pins 1, 3, 5 and 7 for sure.

Hmm so maybe I shouldn't be able to hear anything at pins 2 and 6?

 

[EGRENIER]

Hmm so maybe I shouldn't be able to hear anything at pins 2 and 6?

2 and 6 are the inverted input. I think you should hear the signal, but I can’t confirm. But the above mention you should for sure. If you don’t, then that’s where we need to dig in.

 

[Gsatterw]

2 and 6 are the inverted input. I think you should hear the signal, but I can’t confirm. But the above mention you should for sure. If you don’t, then that’s where we need to dig in.

I'm thinking 3 and 5 on IC2 shouldn't have a signal since all they get is VRef. 2 and 6 I figured would carry the signal to the op amp.

 

[EGRENIER]

So IC1 audio on pin 1,3,5 and 7. And on IC2 pin 1,2,6 and 7….

 

[Gsatterw]

So IC1 audio on pin 1,3,5 and 7. And on IC2 pin 1,2,6 and 7….

View attachment 26389

Why wouldn't IC1 pins 2 and 6 have audio? Shouldn't pins 1 and 2 be the same signal? Is this what you were able to measure on yours? Sorry for the billion questions. Trying to learn all I can.

 

[EGRENIER]

Why wouldn't IC1 pins 2 and 6 have audio? Shouldn't pins 1 and 2 be the same signal? Is this what you were able to measure on yours? Sorry for the billion questions. Trying to learn all I can.

I believe they should, the one I listed are only the one I can be sure. I’m also learning in this process.

 

[Gsatterw]

I believe they should, the one I listed are only the one I can be sure. I’m also learning in this process.

Gotcha. Do you happen to have a kliche or equivalent to check? Or does anyone else for that matter?

 

[BuddytheReow]

IC1 should have signal on both input pins. Pins 3 and 5 are the positive input. In this circuit consider it the raw/original signal. Pins 2 and 6 are the negative input and are part of the feedback loop from the output pins. You can tell it's a feedback loop since you can trace the signal from output back to input. This is also a gain stage.

IC 2 won't have any signal on pins 3 and 5 since they come directly from your power stage

 

[giovanni]

I'm thinking 3 and 5 on IC2 shouldn't have a signal since all they get is VRef. 2 and 6 I figured would carry the signal to the op amp.

Correct. 2 and 6 should have signal.

Edit: wrote this before my phone loaded the post above!

 

[Gsatterw]

Ok new info: turns out when I crank the volume on my amp I do have signal on IC2 pins 2 and 6. Also, when I short pins 2 and 3 on the volume pot I actually get more volume out of the pedal. With the volume pot shorted, if I short Gain.1 (not sure which direction) I actually get distortion out of the pedal...so I guess my pots are bad? Is it possible that I melted them or something on install?