Dirtbaby single repeat

[Lucas G.]

Hello,

I've finished this pedal and the feedback knob don't work, all others work normally. I have just one repeat in all positions of the fdbk knob. PT2399 chip work well I've tested it on other pedal. Here is pictures and one video of this problem. I have the 2015 version.

https://www.youtube.com/watch?v=IUHJdN0plAw





My voltages:

IC1:
1,48
2,81
2,63
0
3,9
3,96
3,92
8,2

IC2:
5
2,48
0
0
2,74
2,48
0,62
0,68
2,49
2,49
2,49
2,49
2,49
2,49
2,49
2,49

IC3:
Varies
3,88
4,02~4,07
0
3,88
4,07
4,04~4,09
8,17

IC4:
3,92
3,9
1,93
0
3,8
3,92
3,92
8,2

Thank you for all.

[jimilee]

Have you tried different2388s? Also, I'd reflow everything and check for solder bridges. Some of the joints look solder starved.


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[madbean]

One repeat means your delay is definitely getting out but it is dying somewhere between R30 and R4. Those resistors look correct on your build, so I would have another look at your Feedback pot. Probably best to audio probe it at lugs 3 and 2 and see if you are getting signal through. If not, something is amiss in the pot.

[Govmnt_Lacky]

Might not help that the Fdbk pot is soldered directly to the PCB..... backwards.

[Zigcat]

Might not help that the Fdbk pot is soldered directly to the PCB..... backwards.

He makes a very valid observation.

[madbean]

Indeed. Did not even notice that.

[Lucas G.]

Thanks for all help, I soldered it directly in the board because I had suspected that this pot was not working them I tested it and soldered again directly to the  board. I was testing with audio probe and when I put in the pin 2 the signal pass but when I try in pin 3 it not work. I will try another potentiometer now and latter I will post the results .
Thanks

[Lucas G.]

One repeat means your delay is definitely getting out but it is dying somewhere between R30 and R4. Those resistors look correct on your build, so I would have another look at your Feedback pot. Probably best to audio probe it at lugs 3 and 2 and see if you are getting signal through. If not, something is amiss in the pot.

You were correct, the problem was the fdbk pot, I had tested it before solder in the circuit but unfortunately something happened when I solder it.
Now the pedal is working correctly and sounding awesome! Thanks for all help guys!