The role of capacitors in circuits

In a DC Circuit, a capacitor is equivalent to an open circuit. A capacitor is a component that can store electrical charge, and it is also one of the most commonly used Electronic components.

The capacitance isElectronic designOne of the most commonly used components in the circuit, what role does the capacitor play in the circuit?

　1. Bypass capacitor

The capacitor used in the bypass circuit is called the bypass capacitor, which is used to provide energy to the local device, uniformize the output of the regulator, reduce the load demand, minimize the impedance, and filter out the interference of the input signal.

2. Decoupling capacitors

The capacitor used in the decoupling circuit is called the decoupling capacitor, and it is mostly used in the DC voltage supply circuit of the multi-stage amplifier to eliminate the coupling interference between each stage amplifier and filter out the interference of the output signal. As shown below.

3. Neutralization

The capacitor used in the neutralization circuit is called the neutralization capacitor, which is mostly used in the high-frequency amplifier of the radio and the high-frequency amplifier of the TV to eliminate the phenomenon of self-excited oscillation.

4. Coupling

The capacitor used in the coupling circuit is called the coupling capacitor, which is mostly used in the transmission and amplification process of low-frequency signals to prevent the static operating points of the front and rear Circuits from interacting with each other. As shown by C1 in the figure below.

5. Timing

The capacitor used in the timing circuit is called the timing capacitor, which is used to control the size of the time constant, so as to control the charging and discharging time of the capacitor.

6. Filtering

The capacitor used in the filter circuit is called the filter capacitor, which is mostly used in various filters to remove signals in a certain frequency band.

7. High frequency vibration reduction

The capacitor used in the high-frequency damping circuit is called the high-frequency damping capacitor, which is mostly used in the audio negative feedback amplifier to eliminate the high-frequency howling phenomenon that may occur in the amplifier.

　8. Compensation

The capacitor used in the compensation circuit is called the compensation capacitor, which is mostly used in the high and low frequency compensation circuit of the deck to enhance the high and low frequency signals in the playback signal.

　9. Points

The capacitor used in the integration circuit is called the integration capacitor, and it is mostly used in the synchronization separation circuit of the electric potential field scanning to separate the field synchronization signal from the field composite synchronization signal.

10. Differentiation

The capacitor used in the differential circuit is called the differential capacitor, and it is mostly used in the trigger circuit to obtain the tip trigger signal from various signals.

11. Bootstrapping

The capacitor used in the bootstrap circuit is called the bootstrap capacitor, which is mostly used in the output stage circuit of the OTL power amplifier to increase the positive half-cycle amplitude of the signal by a small amount of positive feedback.

12. Frequency division

The capacitor used in the frequency divider circuit is called the frequency divider capacitor, which is mostly used in the speaker frequency divider circuit of the audio, so that the speakers of each frequency band work in their respective frequency bands.