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Characteristics And Application Areas Of Variable Capacitors

Characteristics And Application Areas Of Variable Capacitors

September 25 , 2023 0

Variable capacitor, is a capacitance, can be adjusted within a certain range of capacitors, by changing the relative effective area between the pole pieces or the distance between the pieces to change, its capacitance will change accordingly. Usually in the radio receiving circuit for tuning capacitors. It consists of moving piece, fixed piece and insulating medium, change the relative angle of moving piece, fixed piece can change the capacitance. Several variable capacitors can be mounted on the same rotary axis of the moving piece, the composition of coaxial variable capacitors (commonly known as double-link, triple-link, etc.).

The Role OF Variable Capacitors

There are many types of variable capacitors, which can be divided into air dielectric variable capacitors and solid dielectric variable capacitors according to the dielectric material used. In our life, there are common single-connected variable capacitors, double-connected variable capacitors, differential capacitance double-connected variable capacitors, etc. Air dielectric variable capacitors are divided into air single-connected variable capacitors and air double-connected variable capacitors, which are generally used in radios, electronic instruments, high-frequency signal generators, communication equipment and related electronic equipment. Domestic air single-connected variable capacitors are CB-1-X X series and CB-X-X X series, air double-connected variable capacitors are CB-2-X X series and CB-2-X-XX series.　　
Solid dielectric variable capacitors are divided into sealed single-connected variable capacitors, sealed double-connected variable capacitors and sealed four-connected variable capacitors. Sealed single-link variable capacitors are mainly used in simple radios or electronic instruments, sealed double-link variable capacitors are used in transistor radios and related electronic instruments and electronic devices, and sealed quad-link variable capacitors are commonly used in AM/FM multi-band radios.

Types Of Variable Capacitors

Air Dielectric Variable Capacitors

Air medium variable capacitor electrode consists of two groups of metal sheets. Two groups of electrodes in a fixed group for the fixed piece, can rotate a group for the moving piece, the moving piece and the fixed piece of air as a medium.
When turning the air dielectric variable capacitor moving piece so that it is all screwed into the fixed piece of the intermediate, its capacity is the largest; on the contrary, the moving piece will be all screwed out of the fixed piece of the intermediate, the capacity of the smallest.
Air dielectric variable capacitor is divided into air single-link variable capacitor (referred to as air single-link) and air double-link variable capacitor (referred to as air double-link, which consists of two sets of moving piece, fixed piece composition, can be coaxial synchronous rotation), air dielectric variable capacitor is generally used in radios, electronic instruments, high-frequency signal generators, communications equipment and related electronic equipment.
Commonly used domestic air single-connected variable capacitors are CB-1-×××× series and CB-X-××× series, commonly used air double-connected variable capacitors are CB-2-×××× series and CB-2X-××× series.

Solid Dielectric Variable Capacitors

Solid dielectric variable capacitor is in its moving piece and fixed piece (moving, fixed piece are irregular semicircular metal sheet) between the mica sheet or plastic (polystyrene and other materials) film as a medium, the shell for the transparent plastic. Its advantages are small size, light weight; disadvantage is that the noise is big, easy to wear.
Solid medium variable capacitors are divided into sealed single-link variable capacitors (referred to as sealed single-link), sealed double-link variable capacitors (referred to as sealed double-link, which has two sets of moving film, fixed film and media, coaxial synchronous rotation) and sealed four-link variable capacitors (referred to as sealed four-link, which has four and moving, fixed film and media).
Sealed single-connected variable capacitors are mainly used in simple radios or electronic instruments; sealed double-connected variable capacitors are used in transistor radios and related electronic instruments and electronic equipment; sealed four-connected variable capacitors are commonly used in AM/FM multi-band radios.

Symbols For Variable Capacitors

The literal symbol for variable capacitors is C. The literal symbol is generally labelled next to the graphical symbol, with the capacitance value and unit. Customarily, where not with a decimal point of the integer, if not marked units, is piF (pF), for example, 300pF capacitor in the figure only marked 300 can be. Where the number with a decimal point, if not labelled units, is the microfarad (μF).