Pedal Troubleshooting

[tideluva]

I have a specific question and couldn't find an answer so I would appreciate any help that can be offered.  I have a pedal that is causing me some problems with a dual pedal that I have. Both channels operate independently of each other. One works perfectly and the other has issues. When powered on for the first time and side "b" is engaged it has a weird farty sound. After a minute or so it kicks in and sounds awesome and I can toggle on an off with no issues. It is only on initial startup and switched on for the first time. If I unplug the power supply cable and plug it back it experiences the same problem until it "warms up" an then I can use it In my set with no issues
All led's work perfectly
Initial problems happen regardless of orientation of clipping toggle switch
Both sides share the same 9v supply from a Pedal Power 2+

Any suggestions? Thanks for any help you could offer.

[induction]

Read this.

We can't even begin to help you if we don't know the basics. For example, what circuits are you talking about? Are they commercial products or did you build them yourself?

Go through the list and get back to us.

[GibsonGM]

Go thru the Debugging as requested, and be sure to elaborate more if you can...you run this on a power supply, or batteries?  What you're describing sounds a lot like something to do with a power supply cap, at least on the surface.  But Hard Sayin', Not Knowin'! 

[R.G.]

The make-and-sell-pedals cottage industry has become crowded enough that they're starting to go to dual pedals for market differentiation. The company I work for has been doing dual pedals for well over a decade now, so I've run into this issue before. 

It is likely that one of the internal "pedals" has a bias voltage somewhere that is taking a long time to rise to the proper level. This can happen with large-value bias resistors or large-value bias bypass caps, or both. It may also be an issue with some power supply decoupling being large and taking a few seconds to charge up. It is also possible that there is a problem with broken solder joints, cracked resistors, etc. that has made it work this way.

That's about all that can be guessed from your description. If you have schematics, I can make a better guess. What kind of pedal is it?