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Russian metal detector 'pirate' noise (solved)

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(SOLVED) I've built the pirate-the well known in Russia metal detector. There is something wrong with it and I can't figure out what.At first I had no sound at all.I turned it off left it for a while and when I turned it back on again I got this continuous sound -beginning of the video-for a while.When I turned the white pot (22k) the volume of the sound dropped and couldnt get it back to the previous volume.Overall it doesn't seem to work-It doesnt react to metals.Any ideas?
This problem is solved.Here is the complete metal detector.
metal detector for beginners/kids,etc
This problem is solved.Here is the complete metal detector.
metal detector for beginners/kids,etc
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