The role of the capacitor

Role of capacitor: 1, filter: used in filter capacitor in the circuit is called filter capacitance, the power supply filter and various kinds of filter circuit using the capacitance circuit, filter capacitance will be within a certain frequency band signals from the total get rid of. 2, coupling: used in referred to as the capacitance coupling capacitance coupling circuit, the resistance capacity coupling amplifier and other extensive use of the capacitance in the capacitance coupling circuit circuit, blocking circulation communication role. 3, decoupling: in the decoupling capacitor in the circuit as the decoupling capacitor, the multistage amplifier circuit used in the dc voltage supply circuit of the capacitance, the decoupling capacitor to eliminate harmful low frequency coupling between each amplifier. 4, the high frequency vibration free: used in high frequency capacitance of thermoacoustic oscillation circuit are called high frequency damping capacity, in audio feedback amplifier, high frequency self-excited vibration in order to eliminate possible, using the capacitance circuit, to eliminate possible high frequency noise amplifier. 5, resonance: use a capacitor in the LC resonance circuit known as the resonant capacitance, LC will be this kind of capacitor in parallel and series resonance circuit circuit. 6, neutralization: use in neutralizing capacitor in the circuit is called capacitance. High frequency and intermediate frequency amplifier in the radio, the television in the high frequency amplifier, adopt the neutral capacitor circuit, to eliminate self-excited. 7, the bypass: in the bypass capacitor in the circuit as the bypass capacitor, circuit if the need to get rid of a certain frequency band signals from the signal, can be used to bypass capacitor circuit, based on the cut off the signal frequency is different, have full frequency domain ( All the ac signal) The bypass capacitor circuit and high frequency bypass capacitor circuit. 8, timing: capacitor used in the timing circuit called the timing capacitor. In need through the capacitor charging and discharging time control circuit used in the timing capacitor circuit, the control time constant of the size of the capacitor. 9, integral: use a capacitor in the integral circuit called integral capacitance. In the synchronous separation of potential field scanning circuit, adopt the integral capacitor circuit, games from the composite sync signal out of sync signal. 10, differential: capacitor used in the differential circuit is called the differential capacitance. The trigger circuit in order to get the spire trigger signal, using the differential capacitance circuit, from all kinds of ( Mainly rectangular pulse) Get spire pulse signal trigger signal. 11, compensation: used in compensation capacitor in the circuit is called compensation capacitor, the booth of the bass compensation circuit, using the low frequency compensation capacitor circuit, to improve the sound signal in low frequency signal, in addition, there are high frequency compensation capacitor circuit. 12, frequency division: the frequency division circuit capacitor, the capacitor is called the frequency in speaker speaker points frequency circuit, the use of frequency division capacitance circuit, so that the high frequency speaker work at high frequencies, intermediate frequency speaker working in frequencies, low-frequency speakers work in low frequency band. 13, neutralization: use in neutralizing capacitor in the circuit is called capacitance. High frequency and intermediate frequency amplifier in the radio, the television in the high frequency amplifier, adopt the neutral capacitor circuit, to eliminate self-excited. 14, load capacitance: refers to the decision with quartz crystal resonator effective external capacitance load resonant frequency. Load capacitance commonly used standard has 16 pf, 20, 30, 50 and 100 pf pf pf pf. Load capacitance can make appropriate adjustments according to the specific situation, by adjusting the general the work frequency of the resonator can be transferred to the nominal value.

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