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Originally Posted by Fred
Choosing someone knowledged has never been a good idea for those kind of circuits.
People with no knowledge will give you more interesting answers about the principle, if you need names i may be of help.
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I agree.
mikebg is probably among the best forum experimenters I can think of who is knowledgeable of how to design and optimize circuits for metal detecting.
But I doubt he would be able to analyze what this circuit does or is intended to do other than to amplify something between a large metal plate, a coil and a finger on an emitter lead.
Maybe a good starting point is to define exactly what kind of kind of field signal you want the circuit to detect or demodulate before enlisting help to analyze it.
Or if that can't be done, then I think Fred has a good solution.
Best wishes,
J_P