Lecture on Capacitor knowledge(V)

Brief discussion on Electrolytic Capacitance. 
The function of Electrolytic Capacitor in Circuit. 
1. Filtering, in the power supply circuit, the rectifier circuit changes the AC into pulsating DC, and after the rectifier circuit, a large capacity electrolytic capacitor is connected, and the charge-discharge characteristics are utilized. The pulsating DC voltage after rectifying is changed into a relatively stable DC voltage. In practice, in order to prevent various parts of the circuit from changing due to load changes, So there are dozens to hundreds of electrolytic capacitors in the output of power supply and the input of load.Because large capacity electrolytic capacitors generally have certain inductance, they can not filter the high frequency and pulse interference signals effectively. Therefore, a capacitor with capacity of 0.001--0.lpF is connected at both ends to filter out high frequency and pulse interference. 

2.Coupling: in the process of transmitting and amplifying low-frequency signals, capacitance coupling is often used to prevent the static working points of the two stages of the circuits from interacting with each other.In order to prevent the loss of low frequency component of rhyme in the signal, Generally, electrolytic capacitors with large capacity are always used.