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The role of capacitance in the circuit

The role of capacitance in the circuit: a partition DC, exchange connectivity, to prevent low-frequency characteristics, widely used in coupling, blocking, bypass, filtering, tuning, energy conversion and automatic control.

1、 filter capacitor: it connected to the DC voltage between positive and negative, in order to filter out unwanted DC power exchange component, so that a smooth direct current, usually in a large-capacity electrolytic capacitor in the circuit can be connected simultaneously, and other types of a small capacitor to filter out high frequency AC.

2、decoupling capacitors: and then in the power amplifier circuit between positive and negative, to prevent the resistance from the power of positive feedback form parasitic oscillation caused.
3、bypass capacitors: AC and DC signals in the circuit, the capacitor and resistor connected in both ends of the circuit or by a point on the inter-received public potential for the exchange of signals or pulse signals to set a path to avoid the AC signal components due to attenuation through the resistor voltage drop.
4、coupling capacitors: AC signal processing circuit, for connecting the signal source and signal processing circuit or as a link between the two amplifier stage for partition DC, to exchange signals or pulse signals to the DC amplifier before and after class operating point independently of each other.

5、tuning capacitors: the circuit connected to the resonant oscillation of the coil, chosen to play the role of the oscillation frequency.

6、pad capacitance: the main capacitor resonant circuit in series with the auxiliary capacitor, it can adjust the oscillation frequency range becomes smaller, and can significantly improve the low frequency end of the oscillation frequency.

7、the compensation capacitor: the main capacitor resonant circuit in parallel with the auxiliary capacitor, the capacitor can adjust the oscillation frequency extension.

8、middle and capacitors: and connected to the transistor amplifier between the base and emitter to form a negative feedback network, in order to suppress the Transistor capacitance caused by oscillation.
9、frequency stabilization capacitor: in oscillation circuit, the role of stabilizing the oscillation frequency.
10、 timing capacitor: the RC time constant circuit with resistance R in series, will decide the length of time the capacitor charge and discharge.

11、 accelerated capacitance: connected to the oscillator feedback circuit, so that positive feedback process to accelerate and improve the signal amplitude oscillation.

12、reduce the capacitance: the first circuit in the UHF frequency, in order to shorten the length of oscillating inductor in series capacitor.

13、Clapaud capacitance: the capacitance of three-point oscillator circuit, the oscillation coil inductor in series with the capacitor, transistor junction capacitance serve to eliminate impact on the role of frequency stability.

14、Scylla capacitance: the capacitance of three-point oscillation circuit, in parallel with the inductance capacitance oscillator coil ends play an elimination of junction capacitance of transistors, so easily at high frequency oscillator from the vibration.
15、steady increase capacitance: the frequency discriminator, the output signal amplitude for the stable.

16、pre-emphasis capacitor: In order to avoid the audio modulation signal in the process cause the amount of sub-frequency decay and loss, and enhance the setting of the RC network capacitor high frequency components.
17、to increase the capacitance: To restore the original audio signals, audio signals required by the pre-emphasis is to enhance the high frequency components and noise attenuation with the swap, set the RC network of capacitor.

18、phase capacitors: ac signal for the phase change in capacitance.
19、 feedback capacitor: Cross-connected in the amplifier between the input and output, the output signal back into the input capacitor.

20、 buck-limiting capacitance: AC circuit in series, the use of capacitive reactance to the AC characteristics of the alternating current to current limit, and thus constitute a voltage divider circuit.
21、a reverse process of capacitors: for line scan output circuit, and then the line output transistor between the collector and the emitter to produce high-voltage line scanning sawtooth wave pulse reverse process, the pressure is generally above 1500 volt.

22、S correction capacitors: series with the deflection coil circuit, the edge of the extension tubes for correction of linear distortion.

23、bootstrap capacitor: The capacitor charging and discharging energy storage characteristics of the circuit to enhance the potential of a point to reach the point of potential supply voltage is 2 times.

24、eliminating capacitance highlights: Set in the video amplifier circuit, for the shutdown highlights the Elimination of tubes on the residual capacitance.

25、soft-start capacitor: generally connected to the switching power supply switch on the base to prevent the power is turned on, an excessive inrush current or excessive peak voltage added to the switch base, causing damage switch.

26、start capacitor: series with the Vice-winding single-phase motor, the phase for the motor to start the AC voltage, the normal operation of the motor windings after the break with the vice.

27、 operation of capacitors: The Vice-winding single-phase motors in series, for the motor windings to provide phase shift deputy AC current. When the motor running, and vice to hold the series winding.


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