DINGFENG CAPACITOR - - 27 classic applications of capacitors in circuits

1. Filter capacitor: It is connected between the positive and negative poles of the DC voltage to filter out the AC components that are not needed in the DC power supply and smooth the DC current. Generally, large-capacity electrolytic capacitors are used, and other parallel circuits can also be connected in parallel. Type of small-capacity capacitors to filter out high-frequency alternating current.

2. Decoupling capacitor: connected in parallel between the positive and negative poles of the power supply of the amplifier circuit to prevent parasitic oscillation caused by the positive feedback formed by the internal resistance of the power supply.

3. Bypass capacitor: In the circuit of AC and DC signals, connect the capacitor in parallel with the two ends of the resistor or jump to the common potential from a certain point of the circuit to set a path for the AC signal or pulse signal to avoid AC signal components. The voltage drop attenuation is generated by the resistance.

4. Coupling capacitor: In the AC signal processing circuit, it is used to connect the signal source and the signal processing circuit or as the inter-stage connection of two amplifiers. It is used to cut off the DC, let the AC signal or pulse signal pass, and make the DC of the front and rear amplifier circuits The working points do not affect each other.

5. Tuning capacitor: connected at both ends of the oscillating coil of the resonant circuit to play the role of selecting the oscillation frequency.

6. Pad capacitance: Auxiliary capacitance connected in series with the main capacitance of the resonant circuit. Adjusting it can make the oscillation signal frequency range smaller, and can significantly increase the oscillation frequency at the low frequency end.

7. Compensation capacitor: auxiliary capacitor connected in parallel with the main capacitor of the resonant circuit. Adjusting this capacitor can expand the frequency range of the oscillation signal.

8. Neutralizing capacitor: connected in parallel between the base and emitter of the triode amplifier to form a negative feedback network to suppress self-oscillation caused by the capacitance between the triode electrodes.

9. Frequency stabilizing capacitor: In the oscillation circuit, it plays a role in stabilizing the oscillation frequency.

10. Timing capacitor: It is connected in series with the resistor R in the RC time constant circuit to determine the capacitance of the charging and discharging time.

11. Acceleration capacitor: Connected to the oscillator feedback circuit to accelerate the positive feedback process and increase the amplitude of the oscillation signal.

12. Shorten the capacitance: In the UHF high frequency head circuit, in order to shorten the length of the oscillating inductor and the series capacitor.

 13. Carat wave capacitor: In the capacitor three-point oscillation circuit, the capacitor connected in series with the inductive oscillation coil plays a role in eliminating the influence of the junction capacitance of the transistor on the frequency stability.

14. Thira capacitor: In the capacitor three-point oscillation circuit, the capacitor connected in parallel with the two ends of the inductive oscillation coil acts to eliminate the influence of the junction capacitance of the transistor, making the oscillator easy to start oscillation at the high frequency end.

15. Stabilizing amplitude capacitor: used in frequency discriminator to stabilize the amplitude of the output signal.

16. Pre-emphasis capacitance: In order to avoid the attenuation and loss of frequency division during audio modulation signal processing, the RC high-frequency component is set to increase the network capacitance.

17. De-emphasis capacitor: In order to restore the original sound signal, it is required to attenuate the high-frequency components and noise raised by the pre-emphasis in the audio signal, and set the RC capacitor in the network.

18. Phase-shifting capacitor: a capacitor used to change the phase of an AC signal.

19. Feedback capacitor: A capacitor connected across the input and output of the amplifier to return the output signal to the input.

20. Step-down and current-limiting capacitors: connected in series in the AC circuit, using the capacitive reactance characteristics of the AC to the AC to limit the AC current, thereby forming a voltage divider circuit.

21. Reverse capacitance: used in the line scan output circuit, and connected between the collector and the emitter of the line output tube to generate a high voltage line scan sawtooth wave reverse pulse, the withstand voltage is generally above 1500 volts.

22. S correction capacitor: connected in series in the deflection coil circuit, used to correct the extended linear distortion of the picture tube edge.

23. Bootstrap boost capacitor: use the charging and discharging energy storage characteristics of the capacitor to raise the potential of a certain point of the circuit, so that the potential of this point reaches twice the voltage value of the power supply terminal.

24. Capacitance of extinction bright spot: It is set in the video amplifier circuit and used to eliminate the residual bright spot capacitance on the kinescope during shutdown.

25. Soft-start capacitor: generally connected to the base of the switch tube of the switching power supply, to prevent excessive surge current or excessive peak voltage from being added to the base of the switch tube when the power is turned on, resulting in damage to the switch tube.

26. Starting capacitor: It is connected in series with the auxiliary winding of the single-phase motor to provide the starting phase-shifted AC voltage for the motor, and is disconnected from the auxiliary winding after the motor runs normally.

27. Running capacitor: It is connected in series with the secondary winding of a single-phase motor to provide phase-shifted alternating current for the secondary winding of the motor. When the motor is running normally, it is connected in series with the auxiliary winding.

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