Function of capacitor

Function of capacitor:

1. Filter: the capacitor used in the filter circuit is called filter capacitor. This kind of capacitor circuit is used in the power filter and various filter circuits. The filter capacitor removes the signal in a certain frequency band from the total signal.

2. Coupling: the capacitance used in the coupling circuit is called the coupling capacitance, which is widely used in the resistance capacitance coupling amplifier and other capacitance coupling circuits to isolate the direct flow AC.

3. Decoupling: the capacitor used in decoupling circuit is called decoupling capacitor, which is used in the DC voltage supply circuit of multistage amplifier. Decoupling capacitor can eliminate harmful low-frequency cross connection between each amplifier.

4. High frequency vibration elimination: the capacitance used in the high frequency vibration elimination circuit is called high frequency vibration elimination capacitance. In the audio negative feedback amplifier, in order to eliminate the high frequency self excitation that may occur in the vibration, this capacitance circuit is used to eliminate the high frequency squeal that may occur in the amplifier.

5. Resonance: the capacitor used in LC resonance circuit is called resonance capacitor, which is needed in LC parallel and series resonance circuit.

6. Neutralization: the capacitor used in neutralization circuit is called neutralization capacitor. In radio high frequency and medium frequency amplifiers and TV high frequency amplifiers, this neutralization capacitor circuit is used to eliminate self excitation.

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

8. Timing: the capacitor used in timing circuit is called timing capacitor. The timing capacitance circuit is used in the circuit which needs to charge and discharge the capacitance to control the time constant.

9. Integral: capacitor used in integral circuit is called integral capacitor. In the potential field scanning synchronous separation circuit, the field synchronous signal can be obtained from the field composite synchronous signal by using this kind of integrated capacitor circuit.

10. Differential: the capacitor used in differential circuit is called differential capacitance. In order to get the spike trigger signal, the differential capacitance circuit is used to get the spike trigger signal from all kinds of signals (mainly rectangular pulse).

11. Compensation: the capacitor used in the compensation circuit is called the compensation capacitor. In the bass compensation circuit of the card base, the low-frequency compensation capacitor circuit is used to improve the low-frequency signal in the playback signal. In addition, there is the high-frequency compensation capacitor circuit.

12. Frequency division: the capacitor in the frequency division circuit is called the frequency division capacitor. In the speaker frequency division circuit of the speaker of the speaker, the frequency division capacitor circuit is used to make the high-frequency speaker work in the high-frequency section, the medium-frequency speaker work in the middle frequency section, and the low-frequency speaker work in the low-frequency section.

13. Neutralization: the capacitor used in neutralization circuit is called neutralization capacitor. In radio high frequency and medium frequency amplifiers and TV high frequency amplifiers, this neutralization capacitor circuit is used to eliminate self excitation.

14. Load capacitance: refers to the effective external capacitance determining the load resonance frequency together with quartz crystal resonator. The commonly used standard values of load capacitance are 16PF, 20pF, 30pf, 50pF and 100pF. The load capacitance can be adjusted properly according to the specific situation. Generally, the working frequency of the resonator can be adjusted to the nominal value.

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