Working principle of a magnetic rod coil: The magnetic rod can sense various magnetic field signals in space. The coil wound around it, together with a variable capacitor, can generate resonance continuously over a certain range of frequencies. The external frequency corresponding to the resonant frequency will be selected, amplified by the amplifier, and processed to produce sound. Signals that deviate from the resonant frequency of the magnetic rod will be filtered out or attenuated by the coil or capacitor.
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