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Hey folks,
I have a strange problem, which occurred with a couple of builds of mine, and lately with the EQD Speaker Crancker (with BAT41 diodes). I built it, and everything works as it should, but the only problem is that I get a whining noise, like a whistle, but it is working fine and sounds like expected - just adds this whining thing on the top of the sound.
It is driving me nuts, I cannot figure out what is the root cause of this. This also happened with me with the Foxx Tone Machine - I built 4 of that, but one of them produced this whistle (and also worked like it should, if you don't count this noise).
I already built like 50 pedals, so I triple checked everything, cut between the rows, checked the components, etc.. So that's not the problem. I tried different transistors (I always put them into sockets, none of them are soldered to the board) and replace diodes, but nothing helped.
Do you guys have any idea what's causing this?
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