Analysis of the meaning of common capacitors in different circuits (I)

A capacitor is a kind of energy storage element, which has the characteristics of "straight through, low frequency and high frequency". In order to recognize and identify the capacitors in different circuits, the capacitor is given a lot of names according to its role in the line. To understand these names and functions, it is helpful for the reading map to be the stepping foot. The electrician's home introduces some common names. The meaning of it.

1.Filter capacitor

It is connected to the positive and negative poles of the circuit and removes the useless alternating current in the circuit. Generally, large capacity electrolytic capacitors are used and other fixed capacitors are used.

2.Decoupling capacitor

It is connected to the positive and negative poles of the circuit to prevent the parasitic oscillation caused by the positive feedback path formed by the internal resistance of the circuit.

3.Coupling capacitance

It is connected between the signal source and the signal processing circuit or the two stage amplifier to separate the DC and let the alternating current or pulsating signal pass through so that the DC working point of the amplifier is not affected by each other.

4.Bypass capacitor

The AC or pulsating signal in the AC / DC signal is connected at both ends of the resistor or from a point directly to the AC / DC signal, so as to avoid the pressure drop of the AC component in the resistance through resistance.

5.Neutralization capacitance

It is connected between the base of the transistor and the collector, and is used to overcome the self-excited oscillation caused by the interpole capacitance of the transistor.