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Capacitor Symbols

2.3.2023
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This article shows some common and also not so known capacitor symbols with brief description.

Capacitor Symbols

Generic Capacitor

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General Capacitor

Capacitor is an electronic component that stores energy in its electric field. It is the symbol of a generic capacitor. It is a non-polar capacitor having fixed capacitance value. It can be connected in either direction. The second symbol represents an obsolete capacitor symbols used for non-polar capacitors.

Polarized Electrolytic Capacitor

Polarized Electrolytic Capacitor

Such type of capacitors uses electrolyte as one of its electrode that is why they are polarized. The have positive and negative terminals and the top of these symbols represent the positive terminals. A polarized capacitor must be connected in circuit accordingly, otherwise it will blow up. The first two symbols are used in Europe (IEC “new”) while the next two symbols in US (IEEE “old”) . The 5th symbol for capacitor is used in japan.

Variable Capacitor

Variable Capacitor

This symbol represents a variable capacitance whose capacitance can be varied during normal operation. The capacitance is varied by increasing or decreasing the effective area between the plates that effects the capacitance of the capacitor. They are used in LC tuning circuits.

Trimmer Capacitor

Trimmer Capacitor

It is also a variable capacitor whose capacitance is used to calibrate a circuit during manufacturing or troubleshooting a circuit. The capacitance of such capacitor is not normally changed by users during operation.

Bipolar Capacitor

Bipolar Capacitor

They are also known as non polar electrolytic capacitor. It is made of two electrolytic capacitor in such design that they can be used in any polarity. They differ from generic ceramic non polar capacitor by having large capacitance.

Feed through Capacitor

Feed-through Capacitor

This type of capacitor is designed for DC power supply in RF systems. It supply the pure DC signal & also filters any RF component from it.

Voltage Dependent Capacitor

Voltage Dependent Capacitor

The capacitance of such capacitor depend on the applied voltage. Increasing or decreasing the supply voltages changes the size of the dielectric gap between the plates which increases the capacitance.

Temperature Dependent Capacitor

Temperature Dependent Capacitor

These capacitors capacitance depends on its surrounding temperature. The temperature increase or decrease may increase or decrease the capacitance of the capacitor. They are used in temperature sensing application.

Differential Capacitor

Differential Capacitor

It is a variable capacitor with two operate stator and one common rotor. Moving the rotor increases the capacitance in one section & simultaneously decreases it in the other section. However the total capacitance remains the same.

Split Stator Capacitor

Split Stator Capacitor

As the name suggest, such type of variable capacitor has two set of stators that are separated at 180° . A common shaft  rotates  the rotor that has the same vanes placed 180° apart. Such capacitors do not have the 90° limitation of a generic variable capacitor.

Dual Ganged Capacitor

Dual Ganged Capacitor

It is the combination of two variable capacitor. The variable rotor of these both capacitors is controlled using a single shaft. Thus they provide variable capacitance in both capacitors by moving a single rotor.

Butterfly Capacitor

Butterfly Capacitor

Such type of variable capacitor has two separate stators opposite to each other mounted on the body of the capacitor. The rotor whose plates are also butterfly shaped, rotates between these two stators. The capacitance in such capacitor varies equally between either stator & rotor. They are used in symmetrically tuned circuits.

Tempatrimmer / Thermotrimmer

Tempatrimmer Thermotrimmer

Tempatrimmer or also known as thermotrimmer is a small trimmer capacitor with a variable temperature coefficient. They are used in stabilizing the drifting VFos.

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