The role of capacitance in the circuit

The basic function of a capacitor is charging and discharging, but many circuit phenomena extended by this basic charging and discharging effect make the capacitor have various uses. For example, in an electric motor, we use it to generate a phase shift; In it, it is used to generate high-energy transient discharges, etc.; in electronic circuits, capacitors have many different properties. These many different uses, although they are also very different, are all due to their charging and discharging. . Below is a list of the roles of some capacitors:

Coupling Capacitor: The capacitor used in the coupling circuit is called a coupling capacitor. This type of capacitor circuit is widely used in RC-coupled amplifiers and other capacitive coupling circuits to isolate DC-DC.

Filter Capacitor: A capacitor used in a filter circuit is called a filter capacitor. This capacitor circuit is used in power supply filtering and various filter circuits. The filter capacitor removes signals in a certain frequency band from the total signal.

Decoupling Capacitors: Capacitors used in decoupling circuits are called decoupling capacitors. This type of capacitor circuit is used in the DC voltage supply circuit of a multistage amplifier. The decoupling capacitor eliminates unwanted low frequency crosstalk between each stage of the amplifier.

High-frequency vibration-absorbing capacitor: The capacitor used in the high-frequency vibration-damping circuit is called the high-frequency vibration-absorbing capacitor. In the audio negative feedback amplifier, in order to eliminate the high-frequency self-excitation that may occur, this capacitor circuit is used to eliminate The high frequency howling that the amplifier may appear.

Resonant Capacitor: Capacitors used in LC resonant circuits are called resonant capacitors, and such capacitor circuits are required in both LC parallel and series resonant circuits.

Bypass capacitor: The capacitor used in the bypass circuit is called bypass capacitor. If the signal in a certain frequency band needs to be removed from the signal in the circuit, the bypass capacitor circuit can be used. According to the frequency of the removed signal, there is a full frequency domain. (All AC signals) Bypass capacitor circuit and high frequency bypass capacitor circuit.