Hydra delay - no signal

[tpmc12]

Hello everyone,

Finishing off the hydra delay. When I go to test it I’m not getting any signal when the pedal is off or on. The led does turn on.

Below are the pictures with a focus on my off board wiring because that is where I suspect the issue is. The solder joints for the footswitch daughter board are very dull - my first though is to reflow all of those in case one of them is cold.

It’s also my first time using these enclosed jacks.

 

[Erik S]

I’ve never used that style jack, but I suspect you may have wired them incorrectly.

I think both wires should be on the same side.

 

[tpmc12]

I’ve never used that style jack, but I suspect you may have wired them incorrectly.

I think both wires should be on the same side.

View attachment 112898

Thank you - I am now getting signal in bypass and when the pedal is engaged, however I am not getting any delays/repeats.

Volume knob works, but when I max the mix pot signal cuts out completely.

 

[tpmc12]

Took more photos focusing on the board.

 

[falco_femoralis]

What's the big red wima? Should be a 1nF

What's the horizontal line going across in your first pic of your second post?

 

[Erik S]

That crystal oscillator look a little different than the ones I usually see used. The part number looks pretty clear but I couldn’t find it. Is it 32.768 kHz?

 

[DDad]

Lots of flux, hard to tell if there are solder balls/bridges causing shorts. I would clean the board to make sure there aren't any shorts due to solder bridges.

 

[comradehoser]

Could use a clean with a toothbrush and isopropyl alcohol. I also was wondering with ErikS about that slashy looking line, and make sure there are no solder bridges between pads.

Have you tried each "head" switch? And dimed the knobs? And ensured that the cables are going into the right jacks? I assume you have, but you never do know, especially with myself.

 

[Locrian99]

Could use a clean with a toothbrush and isopropyl alcohol. I also was wondering with ErikS about that slashy looking line, and make sure there are no solder bridges between pads.

Have you tried each "head" switch? And dimed the knobs? And ensured that the cables are going into the right jacks? I assume you have, but you never do know, especially with myself.

Ive spent way too much time trouble shooting a build where the in was in the our…

 

[Locrian99]

Here is the schematic.

https://docs.pedalpcb.com/project/PedalPCB-Hydra-Schematic.jpg

I would first do the clean previously mentioned. Then i would audio probe to see if you have signal entering the fv-1 and go from there. Double check all your values etc. those mlcc’s are easy to get wrong

 

[tpmc12]

Thank you for the schematic - I had to push this aside for a bit with work and life generally. But over the weekend I built a simple DIY audio probe and figured out how to use it - took an extra second with the pedal upside down.

Pins 1 and 2 - no signal. Of course 27 and 28 also had no signal.

R3 - Was able to get a signal on both sides of the pcb at both contact points, though my thought is to go in and reflow both joints at R3 after work tonight. My assumption is that I can still get a signal with the probe through a cold solder joint if the probe is making contact with the component lead (which is not properly soldered to the pcb terminal/pad) - is this correct?

Is there anything else I should check based on the symptoms get signal from looper ---> pedal input ---> audio probe at R3 ---> amp but no signal when the audio probe is at pin 1 of the FV1?

 

[tpmc12]

Ive spent way too much time trouble shooting a build where the in was in the our…

This is the story of me learning how to use the audio probe. Always kept forgetting I was looking at the pedal upside down so input/output locations were switched.

 

[FuzzyLotus]

This is the story of me learning how to use the audio probe. Always kept forgetting I was looking at the pedal upside down so input/output locations were switched.

One day I'll build one too

 

[tpmc12]

Thank you for the schematic - I had to push this aside for a bit with work and life generally. But over the weekend I built a simple DIY audio probe and figured out how to use it - took an extra second with the pedal upside down.

Pins 1 and 2 - no signal. Of course 27 and 28 also had no signal.

R3 - Was able to get a signal on both sides of the pcb at both contact points, though my thought is to go in and reflow both joints at R3 after work tonight. My assumption is that I can still get a signal with the probe through a cold solder joint if the probe is making contact with the component lead (which is not properly soldered to the pcb terminal/pad) - is this correct?

Is there anything else I should check based on the symptoms get signal from looper ---> pedal input ---> audio probe at R3 ---> amp but no signal when the audio probe is at pin 1 of the FV1?

ok - reflowed R3 and am now getting signal to pin 1. I am not getting anything out of pin 28. Pin 6 and 8 had 3.3v running to them then my meter ran out of batteries and I called it a night. Should have some more time over the next few days to review the schematic and probe around some more.