Dark Rift Delay not working

[zedfyrom]

Hi all, as title say I have trouble with a Dark Rift pcb.

The pedal it's working but it's giving just a single repeat. Well actually it's not just a single repeat but the feedback is pratically inaudible except for the first, still low, repetition. I can even tell the modulating it's working but by now this thing it is a useless pedal. I really don't know what the issue can be. I already tried to substitute the chips.
3 things to note in the photo:
I swapped the lm324 with a tl074 to see if i can get any change, but nothing.
D2 it's in reverse to what the pcb tell. I reversed it to try to align to what the build guide says but that still not was the fault.
In the place of R7 there are 2 resistor in parallel that i tested to be 8K (required value is 8.2k, but i don't think that's the problem again)

Please note that the mix and the feedback pots are maxed out in this audio sample.

https://soundcloud.com/gabriele-pala-404092013%2Fdark-rift-delay-rotto-del-dio-melanzana

And here are my voltage:
Pt2399
Pin1: 4.5
Pin2: 2.25
Pin3: 0
Pin4: 0
Pin5: 2.63
Pin6: 2.25
Pin7: fluctuating (average 0.32)
Pin8: fluctating 0.65 to 0.66
Pin9: 2.25
Pin10: 2.25
Pin11: 2.25
Pin 12: 2.25
Pin 13: fluctuating 0.01 to 0.02
Pin 14: 4.5
Pin 15: 2.25
Pin16: 2.25
Tl074:
Pin1: 4
Pin2: 4
Pin3: 2.2 then start to drop
Pin4: 0
Pin5: 3.93
Pin6: 4.02
Pin7: 4.02
Pin8: 8.05
lm833:
Pin1: 2.26
Pin2: 2.26
Pin3: 2.20
Pin4: 0
Pin5: 2.22
Pin6: 2.25
Pin7: 2.26
Pin8: 8.05
lm324:
Pin1: oscillating from 2.5 to 5.something
Pin2: 4
Pin3: 3.92
Pin4: 8.05
Pin5: oscillating like pin 1
Pin6: 3.6
Pin7: oscillating from 1.something to almost 7
Pin8: almostl ike pin7
Pin9: like pin 1
Pin10: like pin 1
Pin11: 0
Pin 12: 3.9
Pin 13: oscillating fom 3.8 to 4.2
Pin 14: oscillating from 1.6 to 6

 

[zedfyrom]

Here are the photos

 

[BuddytheReow]

I had a similar problem. Are your 1u caps tantalum or mlcc? I swapped my tantalums out and cleared it right up.

 

[zedfyrom]

I had a similar problem. Are your 1u caps tantalum or mlcc? I swapped my tantalums out and cleared it right up.

I think I have mixed tantalum, polyester and multilayer. Which you advise to use? I didn't think that different type of non polarized caps could make all this difference. Thanks. I have another Dark Rift board that I still have to wire and box, let's see if I have the same problem on that one

 

[BuddytheReow]

don't use polarized if you're unsure how to orient the caps

 

[Synchrony Pedalworks]

I think I have mixed tantalum, polyester and multilayer. Which you advise to use? I didn't think that different type of non polarized caps could make all this difference. Thanks. I have another Dark Rift board that I still have to wire and box, let's see if I have the same problem on that one

I used polyester caps and did not have any troubles.

 

[jimilee]

Have tried a different pt2399? Sometimes, you’ll run across a bad one that will do that.

 

[zedfyrom]

don't use polarized if you're unsure how to orient the caps

I didn't used any polarized caps in place of the non polarized

 

[zedfyrom]

Have tried a different pt2399? Sometimes, you’ll run across a bad one that will do that.

Yes I have tried multiple ones, I don't think that's the problem but later I will try to swap it with one from another delay that's 100% working

 

[BuddytheReow]

Have you verified that every resistor and cap are the correct values? That should have been your first step apart from checking all your solder joints

 

[zedfyrom]

Have you verified that every resistor and cap are the correct values? That should have been your first step apart from checking all your solder joints

Yes they are correct Wait, I'm not sure if I used tantalum caps and I realized that if I have used them, I didn't knew they were polarized.
I'll order a bunch of non polarized 1uf and try to swap them. Thanks guys

 

[neiltheseal]

What capacitor value do you have in C8?

I put a 1u there instead of a 1n when I built mine.

 

[zedfyrom]

What capacitor value do you have in C8?

I put a 1u there instead of a 1n when I built mine.

lmao yes I put a 1uf in C8. I'll try to substitute it when I have some free time

 

[neiltheseal]

lmao yes I put a 1uf in C8. I'll try to substitute it when I have some free time

Glad you found it. It works a lot better with the 1n cap there.

 

[zedfyrom]

Update: C8 it's now 1n but the only thing that changed is that the repetition volume is louder. And i checked that my 1Uf caps are not polarized. It's the first time I'm getting so many trouble on a PCB