SOLVED Delyk Cherry Pie help!

[ThisIsAlec]

Hi brain trust,

Hoping for some help here. This is the Delyk PCB tremolo with separate high and low passes - which you can run independently, in-sync, or counter-synced. Cool right?

Details here: https://www.delykpcb.com/product/cherry-pie-tremolo-pcb/

But trouble in paradise: everything on the high pass side of things works, but when I try to engage anything on the low pass I get a clean signal (when engaging just the low pass filter) or the high pass tremolo with a click on tempo where the low pass should be. The tempo LED also does not activate regardless of the settings.

Any ideas? I’m stumped. I’ve tried several different LDRs in the high pass without any difference, but I can see that the LED is oscillating as expected. Note that I’m using the TAPLFO V3, so omitted X1, C6, C7, R10 and R12.

Welcome ideas!

 

[BuddytheReow]

Are your ICs oriented correctly? They go both ways in the pics

 

[ThisIsAlec]

Are your ICs oriented correctly? They go both ways in the pics

Yeah, they go both ways.

 

[benny_profane]

I’ve tried several different LDRs in the high pass without any difference, but I can see that the LED is oscillating as expected.

Did you mean low pass here?

 

[ThisIsAlec]

Did you mean low pass here?

Yes, apologies for that confusion. I’m quite certain it is not an issue with the LDR.

 

[fig]

I can't make out the 3-1/8w 1MΩ resistor bands ...here are two...they appear to be 5-band 10M.....maybe?



Edit: Looking again....that could easily be yellow (not green), so it's probably correct.

 

[ThisIsAlec]

Thanks all, this is a total loss. Starting again maybe someday when the boards are back in stock.

 

[Bricksnbeatles]

Seems a bit premature to call it a *total* loss. Put it aside and revisit it when you’re feeling up to troubleshooting some more.

 

[ReinoutVrijhoef]

Have you tried to turn the "Tone" knob? This has an effect on the bass- and treble-only modes.

 

[Graal]

I had the same problem on the bass mode and I solved it just moving a little bit clockwise the trimmer (green circle).
I also had a click when engaging the volume mode that I solved in the same way (red circle).
Hope this could help.