FET -- understanding the function of capacitance in circuit from its name

Capacitor is almost an indispensable energy storage element in electronic circuit. It has the characteristics of blocking DC, connecting AC and preventing low frequency. It is widely used in coupling, DC isolation, bypass, filtering, tuning, energy conversion and automatic control circuits. Being familiar with the names and meanings of capacitors in different circuits will help us understand electronic circuit diagrams.
1. The filter capacitor is connected between the positive and negative poles of the DC power supply to filter the unwanted AC components in the DC power supply and make the DC level slip. Generally, large capacity electrolytic capacitors are often used, and other types of small capacity capacitors can also be connected in parallel in the circuit to filter out high-frequency AC.
2. The decoupling capacitor is connected between the positive and negative poles of the power supply of the amplification 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 at both ends of the resistance or across the common potential from a point of the circuit, and set a path for AC signal or pulse signal to avoid voltage drop attenuation of AC signal components due to resistance.
4. In the AC signal processing circuit, the coupling capacitor is used to connect the signal source and the signal processing circuit or as the stage connection between the two amplifiers to isolate the DC and let the AC signal or pulse signal pass through, so that the DC working points of the front and rear stage amplification circuits do not affect each other.
5. The tuning capacitor is connected at both ends of the oscillation coil of the resonant circuit to select the oscillation frequency.
6. The pad capacitor is an auxiliary capacitor connected in series with the main capacitor of the resonant circuit. Adjusting it can reduce the frequency range of the oscillation signal and significantly improve the oscillation frequency at the low frequency end. By properly selecting the capacity of the pad capacitor, the low-end frequency curve can be increased upward, which is close to the ideal frequency tracking curve.
7. The compensation capacitor is an auxiliary capacitor connected in parallel with the main capacitor of the resonant circuit. Adjusting the capacitor can expand the frequency range of the oscillation signal.
8. The neutralizing capacitor is connected in parallel between the base and emitter of the triode amplifier to form a negative feedback network to suppress the self-excited oscillation caused by the inter electrode capacitance of the triode.
9. The frequency stabilizing capacitor plays a role in stabilizing the oscillation frequency in the oscillation circuit.
10. The timing capacitor is connected in series with the resistor R in the RC time constant circuit to jointly determine the charging and discharging time.
11. The accelerating capacitor is connected to the oscillator feedback circuit to accelerate the positive feedback process and improve the amplitude of the oscillation signal.
12. Shortening capacitance in UHF tuner circuit, the capacitance connected in series to shorten the length of oscillating inductor.
13. Clapper capacitor is a capacitor connected in series with inductive oscillation coil in capacitive three-point oscillation circuit, which can eliminate the influence of transistor junction capacitance on frequency stability.
14. In the capacitive three-point oscillation circuit, the Scylla capacitor is connected in parallel with both ends of the inductive oscillation coil to eliminate the influence of transistor junction capacitance and make the oscillator easy to vibrate at the high frequency end.
15. The amplitude stabilizing capacitor is used in the frequency discriminator to stabilize the amplitude of the output signal.
16. Pre weighting capacitance in order to avoid attenuation and loss of frequency division caused by audio modulation signal during processing, the RC high-frequency component is set to enhance the network capacitance.
17. De emphasis capacitance to restore the original sound signal, it is required to attenuate the high-frequency component and noise in the audio signal, and set the capacitance in the RC network.
18. Phase shifting capacitance capacitance used to change the phase of AC signal.
19. The feedback capacitor is connected between the input and output terminals of the amplifier to make the output signal output back to the capacitor at the input terminal.
20. The step-down current limiting capacitor is connected in series in the AC circuit to limit the current of the AC by using the capacitive reactance of the capacitor to the AC, so as to form a voltage dividing circuit.
21. The reverse capacitance is used in the line scanning output circuit and connected between the collector and emitter of the line output tube to generate high-voltage line scanning sawtooth wave reverse pulse. Its withstand voltage is generally above 1500V.
22. The correction capacitor is connected in series in the deflection coil loop to correct the extension linear distortion of the picture tube edge.
23. The bootstrap boost capacitor uses the charging and discharging energy storage characteristics of the capacitor to raise the potential at a certain point of the circuit, so that the potential at this point reaches twice the voltage value of the power supply terminal.
24. The bright spot elimination capacitor is set in the video amplifier circuit to eliminate the capacitance of residual bright spots on the picture tube when it is turned off.
25. The soft start capacitor is 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 supply is turned on, resulting in damage to the switch tube.
26. The starting capacitor is connected in series on the auxiliary winding of single-phase motor to provide starting phase-shifting AC voltage for the motor. Disconnect from the auxiliary winding after the motor operates normally.
27. The operating capacitor is connected in series with the auxiliary winding of the single-phase motor to provide phase-shifting AC current for the auxiliary winding of the motor. When the motor operates normally, it shall be connected in series with the auxiliary winding.

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