The main role of the capacitor on the board

In the power supply circuit, the rectifier circuit converts the alternating current into a pulsating direct current, and after the rectifier circuit is connected to a larger capacity electrolytic capacitor, the charging and discharging characteristics are used to make the rectified pulsating DC voltage become relatively comparative Stable DC voltage.

In practice, in order to prevent changes in the supply voltage of each part of the circuit due to load changes, there are typically tens to hundreds of microfarads of electrolytic capacitors at the output of the power supply and at the power input of the load. Since the large-capacity electrolytic capacitor generally has a certain inductance, the high-frequency and pulse-interference signals cannot be effectively filtered out, so a capacitor with a capacity of 0.001--0.lpF is connected in parallel at both ends to filter out the high-frequency and pulse interference.

Coupling: In the process of transmission and amplification of low-frequency signals, in order to prevent the static working points of the two-stage circuit from interacting with each other, capacitor coupling is often used. In order to prevent the loss of the low frequency component of the signal in the signal, the electrolytic capacitor with a large capacity is generally used.

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