metal detector circuit function, and what are the key components?

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A basic metal detector circuit operates by creating an electromagnetic field through a coil. When this field encounters a metal object, it induces eddy currents in the metal, altering the field. This change is detected by the circuit, usually causing an audible signal or visual indicator to alert the user. Key components include the oscillator (to generate the electromagnetic field), the coil (which acts as the antenna), and the signal processor (to interpret changes in the field).

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