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For Capacitor Symbols, Units, And Packages.

For Capacitor Symbols, Units, And Packages.

September 05 , 2023 0

Symbols For Several Common Types Of Capacitors

Symbols For Capacitors

Below is a very common capacitor symbol indicating a non-polarized capacitor with a relatively small capacitance.

The following figure is this capacitor capacity is slightly larger, there are positive and negative poles, welding to correctly distinguish between positive and negative poles.

Below are capacitor symbols that indicate non-polarity, which generally indicates a larger capacitance.

Capacitance Unit

The basic unit of capacitance is: F (law), in addition there are μF (microfarad), nF (nanofarad), pF (picofarad), capacitance F capacity is very large, we see the general are μF, nF, pF unit, 1F = 1000000μF ; 1μF = 1000nF = 1000000pF ; 1nF = 1000pF

Capacitor Withstanding Voltage

Each capacitor has its own voltage withstand value, the nominal voltage withstand value of ordinary non-polarized capacitors are: 63V, 100V, 160V, 250V, 400V, 600V, 1000V, etc. The nominal voltage withstand value of polarized capacitors is relatively lower than that of non-polarized capacitors. The nominal withstand voltage values of polarized capacitors are lower than those of non-polarized capacitors, such as 4V, 6.3V, 10V, 16V, 25V, 35V, 50V, 63V, 80V, 100V, 220V, 400V and so on.

0402 is the cheapest, if the package is small again, the price is more expensive, too small, not good manufacturing, if larger than 0402 is also more expensive, more expensive materials, so usually 0603 0805 1206 more. If it is too small, manufacturers of high production costs, if large material costs are high.

Classification of Variable Capacitors

Variable capacitors can be categorized into air dielectric variable capacitors and solid dielectric variable capacitors according to the dielectric material used.

Air Dielectric Variable Capacitors

The electrodes of an air dielectric variable capacitor consist of two sets of metal plates. 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 between the air as a medium.

When rotating the air dielectric variable capacitor moving piece so that it is all screwed into the fixed piece between the maximum capacity; Conversely, the moving piece will be all screwed out of the fixed piece between the minimum capacitance.

Air dielectric variable capacitor is divided into air single-connected variable capacitor (referred to as air single-connected) and air double-connected variable capacitor (referred to as air double-connected, which consists of two sets of movable piece, fixed piece, can be coaxial synchronous rotation), air dielectric variable capacitor is generally used in radios, electronic instruments, high-frequency signal generators, communication equipment and related electronic equipment.

Solid Dielectric Variable Capacitor

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; disadvantages are large noise, 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 pieces, fixed pieces and media, coaxial synchronous rotation) and sealed four-link variable capacitors (referred to as sealed four-link, which has four and moving, fixed pieces 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.