The noise produced by a tiny magnetic microphone in the water, seem which attracts several species of fish. The low impedance Magnetic microphone can be coupled in the form mechanics to the top of a bottle, used as ballast, which is immersed in the place where you want to fish. the transformer T1 is output for transistors with an impedance between 200 and 2000 ohm and frequency adjustment of the operation (which is obtained experimentally) is effected with P1.
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