Commonly used adjustable inductors include oscillation coils for semiconductor radios, line oscillation coils for televisions, line linear coils, medium frequency trap coils, frequency compensation coils for audio, and wave blocking coils,

Line linear coils, medium frequency trap coils, audio frequency compensation coils, wave blocking coils, etc.

1, semiconductor radio oscillation coil: This oscillation coil in the semiconductor radio with variable capacitors and other components of the local oscillation circuit, used to generate an input tuning circuit to receive the radio signal higher than 465kHz local oscillation signal.

2, television with line oscillation coil: line oscillation coil used in the early black and white television set, it and the peripheral resistive components and line oscillation transistors and other components of self-excited oscillation circuit (three-point oscillator or intermittent oscillator, multi-harmonic oscillator), used to generate the frequency of 15625HZ rectangular pulse voltage signal.

3, line linear coil: line linear coil is a non-linear magnetic saturation inductor coil (its inductance decreases with the increase of current), it is generally connected in series in the line deflection coil circuit, the use of its magnetic saturation characteristics to compensate for the linear distortion of the image.