Simple Relay Bypass Erratic Behavior

[pnggolf22]

Managed to make it through 15 or so builds without issue, but this one has got me stumped. Pedal in question is a dual pedal with a Caesar chorus feeding into a FV-1 delay in one 1590XX enclosure. I built it about 3 months ago and other than some trouble biasing the Caesar everything has worked perfectly from the beginning.

It was working fine through practice this morning, then I left my board on for the ~45 mins before playing for real. Came back to play and both chorus and delay were switched on and the bypass would not respond to the foot switches at all. Cycled power a couple times with no change in response. Tapping on the enclosure itself would occasionally get one or both effects to switch off but within a couple seconds they came right back on. I opened it up and there’s no obvious points of contact that could be causing this issue. Everything still looks good like the day it was built, as far as I can tell.

I’d appreciate any help that can be offered. I’ve got a couple other builds with the same bypass board so I really want to find out what’s going on before I have problems with those too.

Thanks!

 

[pnggolf22]

 

[jimilee]

Do you rehearse somewhere where power was regulated? I used to rehearse in a mini warehouse place with about a million other bands. Power was wonky sometimes. Also, was it a bit chilly where you were?

 

[pnggolf22]

Power is clean, as far as I know. I play in the same place once or twice a week and have never had any issue before. Full temp control too, usual sits right around 70*.

 

[Gordo]

What about power connections from the Kobi jack back thru to the bypass boards. Any chance those wires may be a bit wonky? The odds of having two flaky bypass boards or bad regulators/555's has to be pretty slim.

 

[pnggolf22]

That’s what I’m checking next. I did use one of the cheap Tayda low profile jacks, and while I’ve never had any trouble with them I know others have. Gonna swap to a Lumberg and see if I can replicate the problem.

 

[Gordo]

Ironically I've had only 1 problem with Taydas and 1 problem with the real Lumbergs. The Lumberg had a dead short that drove me nuts trying to troubleshoot and the Tayda was intermittent.

 

[SYLV9ST9R]

Managed to make it through 15 or so builds without issue, but this one has got me stumped. Pedal in question is a dual pedal with a Caesar chorus feeding into a FV-1 delay in one 1590XX enclosure. I built it about 3 months ago and other than some trouble biasing the Caesar everything has worked perfectly from the beginning.

It was working fine through practice this morning, then I left my board on for the ~45 mins before playing for real. Came back to play and both chorus and delay were switched on and the bypass would not respond to the foot switches at all. Cycled power a couple times with no change in response. Tapping on the enclosure itself would occasionally get one or both effects to switch off but within a couple seconds they came right back on. I opened it up and there’s no obvious points of contact that could be causing this issue. Everything still looks good like the day it was built, as far as I can tell.

I’d appreciate any help that can be offered. I’ve got a couple other builds with the same bypass board so I really want to find out what’s going on before I have problems with those too.

Thanks!

Did you ever get this resolved? Finished a build last night and there seem to be a problem with the simple relay board. The effect is always on, and the 78L09 gets very hot very fast. There wasn't any visible problem with soldering, but I'll do another inspection later today, just you had any hindsight from your issues.