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positive after the switch (with buzzer positive) and negative to battery / circuit negative.
What battery are you using?
Exactly.You think like this: ?
the length and shape of the pickup should not be critical...
But can anyone is able to estimate the dimensions of that spiral based on the recording, though it was written in the recording that, for example, only a straight wire did not produce a strong enough signal.
Try something like 10 - 15mm diameter.