220V AC Inducer Contactor
220V AC Inducer Contactor Adjustable inductor Commonly used adjustable inductors include an oscillating coil for a semiconductor radio and a line oscillating coil for a television set. Line linear coil, intermediate frequency trap coil, acoustic frequency compensation coil, wave blocking coil,...
220V AC Inducer Contactor
Commonly used adjustable inductors include an oscillating coil for a semiconductor radio and a line oscillating coil for a television set.
Line linear coil, intermediate frequency trap coil, acoustic frequency compensation coil, wave blocking coil, etc.
1. Oscillation coil for semiconductor radio: This oscillation coil is composed of a local oscillator circuit in a semiconductor radio and a variable capacitor, and is used to generate a local signal of 465 kHz higher than a radio signal received by the input tuning circuit. The outside is a metal shield, and the inside is composed of a nylon lining, an I-shaped core, a magnetic cap and a lead seat. The winding of the high-strength enameled wire is used on the I-shaped core. The magnetic cap is mounted on a nylon frame in the shield, and can be rotated up and down to change the inductance of the coil by changing its distance from the coil. The internal structure of the TV IF notch coil is similar to that of the oscillating coil, except that the magnetic cap has a tunable core.
2. The oscillating coil for TV sets: The oscillating coil is used in the early black-and-white TV. It consists of a self-excited oscillating circuit with a peripheral RC and a oscillating transistor (three-point oscillator or intermittent oscillator, multi-resonant ,) used to generate a rectangular pulse voltage signal with a frequency of 15625HZ.
The center of the core of the coil has a square hole, and the line synchronization adjustment knob is directly inserted into the square hole, and the synchronous adjustment knob is rotated to change the relative distance between the core and the coil, thereby changing the inductance of the coil and keeping the line oscillation frequency For the 15625HZ, the line sync pulse sent by the automatic frequency control circuit (AFC) generates synchronous oscillation.
3. Linear coil: The linear coil is a kind of nonlinear magnetic saturation inductor (the inductance decreases with the increase of current). It is generally connected in series in the line deflection coil loop, and compensates by its magnetic saturation characteristics. Linear distortion of the image.
The linear coil is wound with an enameled wire on a "work" type ferrite high-frequency core or a ferrite magnet, and an adjustable permanent magnet is placed beside the coil. The linear inductance is achieved by changing the relative position of the permanent magnet and the coil to change the inductance of the coil.