Introduction to the names and effects of capacitors in different circuits
Capacitor is a kind of energy storage element, with the characteristics of "straight through cross, low frequency through high frequency", people in order to know and identify the capacitor in different circuits, according to its effect in the line and give it many names, understand these names and effects, to read the map is to help. Here's what some common names mean.
1. Filter capacitor
It is connected between the positive and negative poles of the circuit to remove the useless communication current in the circuit, and large-capacity electrolytic capacitors are generally selected, and other fixed capacitors are also selected.
2. Decoupling capacitor
It is connected between the positive and negative poles of the circuit to prevent the parasitic vibration caused by the positive reaction path formed by the internal resistance of the power supply.
3. Coupling capacitor
It is connected between the signal source and the signal processing circuit or two-stage amplifier to separate the direct current, so that the communication current or pulsating signal passes through, so that the DC operation point of the trusted amplifier does not affect each other.
4. Bypass capacitor
It is connected to both ends of the resistor or directly from a certain point to the common telecom, which sets up a path for the communication or pulsation signal in the AC and DC signals to prevent the voltage drop of the communication components when passing through the resistor.
5. Neutralize the capacitance
It is connected between the base and collector of the triode and is used to overcome the self-excited vibration caused by the capacitance between the transistor poles.
6. Groove capacitor (tuned capacitor)
Capacitors connected to both ends of a resonant circuit or vibrating circuit.
7. Pad the capacitor
In the circuit, the frequency scale of the vibration signal can be reduced, and the capacitance of the vibration frequency at the low frequency end is significantly improved, which is connected in series with the main capacitor of the groove.
8. Compensate capacitance
In the vibration circuit, the capacitor that expands the frequency scale of the vibration signal is connected in parallel with the main capacitor to provide an auxiliary effect.
9. Reverse path capacitor
It is also connected between the collector and the emitter of the row output tube, and is used to generate the reverse path of the line scan sawtooth wave.
10. Self-bootstrap boost capacitor
Its energy storage is used to increase the potential of the circuit so that its potential value is higher than the power supply voltage that supplies power to that point.
11. "S" calibrate capacitor
It is connected in series in a deflection coil circuit and is used to correct the extension distortion on both sides.
12. Frequency stabilized capacitor
In a vibration circuit, a capacitor used to stabilize the vibration frequency.
13. Punctual capacitor
In the RC punctuality circuit, it is connected in series with the resistor R to determine the length of the capacitor.
14. Step-down current-limiting capacitor
It is connected in series in the communication circuit and is used to divide the voltage and limit the current of the capacitive reactance of the communication electric.
15. Shorten the capacitance
This capacitor is a capacitor that is connected in series in UHF high-frequency heads to shorten the length of the vibration inductance.
16. Clapped capacitors
In a capacitor three-point vibration circuit, the capacitor connected in series to the vibrating inductor coil improves frequency stability due to the influence of the capacitor of the transistor junction of the water transport.
17. Thira capacitors
In a capacitor three-point vibration circuit, the capacitor connected to both ends of the vibrating inductor coil is made easier to vibrate at a vibration frequency in order to eliminate the influence of the transistor junction capacitance.
18. Speed up the capacitance
It is connected to the vibration reaction circuit to accelerate the positive reaction process and improve the vibration fluctuations.
19. Pre-weighted capacitance
In order to prevent the attenuation or loss of the high-frequency components during the modulation of the audio modulation signal, the capacitance in the RC network of the high-frequency components should be appropriately increased.
20. De-weighted capacitance
The pre-increased high-frequency component of the audio signal is attenuated along with the noise, and the capacitance in the RC network is restored to the original appearance of the accompanying signal.
21. Amplitude stabilization capacitance
In the frequency discriminator, it is used to stabilize the output signal fluctuations.
22. Spot reduction capacitance
In CRT subassembly circuits, capacitance is used to eliminate shutdown highlights.
23. Phase-shifting capacitance
A capacitor used to change the phase of a communication electrical signal.
24. Reaction capacitance
The capacitor 25, the soft-start capacitor that is used to react to the signal at the input and output terminals of the amplifier
It is usually connected to the base of the power switch to prevent the inrush current or voltage added to the switch base when the machine is turned on and the switch tube is too large and damages the switch.
26. Starting capacitor
It is connected in series to the secondary winding of the single-phase motor, and the phase-shifting communication current for the starting of the secondary winding of the motor is supplied, and the motor is disconnected from the secondary winding when it is working normally.
27. Working capacitor
It is connected in series to the secondary winding of the single-phase motor, and the phase-shifting communication current is supplied to the secondary winding of the motor, and the secondary winding is still in series in the circuit when the motor is working normally.
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