![]() ![]() The change in inductance, in turn, changes the oscillating frequency of the tank circuit. ![]() This changes the magnetic permeability of the inductor’s core, causing the inductance to change. When metallic material approaches the center of the inductor (the detector coil), it enters the magnetic field created by the inductor. The inductor of the above tank circuit forms the detector of the metal detector (a large coil of wire). The capacitor will then charge with the opposite polarity, and when the magnetic field has completely collapsed, the capacitor will discharge, resulting in current flow in the direction opposite to that of the original current. Current discharged from the capacitor flows through the inductor when the capacitor is completely discharged, the inductor's decreasing magnetic field maintains the current flow. In a tank circuit, energy is transferred repeatedly between a capacitor and an inductor, resulting in oscillation. In the above circuit, the series capacitor and inductor form a tank circuit. ![]()
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