A coil is an electronic component, which is wound into one or more ring shapes by wires, and is used for inductance, filtering, coupling, driving and other functions in the circuit. according to the application, it can be divided into inductance coil, transformer coil, filter coil, resonant coil and so on. according to the structure, it can be divided into single-layer coils, multi-layer coils, coaxial coils, choke coils, etc. according to the material, it can be divided into copper coil, alumin

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