The capacitor is an indispensable configuration in the operation of the circuit board, and plays an important role in the circuit board. The main function of the capacitor is: coupling and filtering.

The capacitor is an indispensable configuration in the operation of the circuit board, and plays an important role in the circuit board. The main function of the capacitor is: coupling and filtering.

Capacitive coupling function:

The coupling function of the capacitor is mainly responsible for transmitting and amplifying the low-frequency signal when the circuit board produces a low frequency. In order to avoid the mutual influence of the static operation of the front and rear circuit boards, the coupling of the capacitor is used. On the other hand, in order to prevent excessive loss of low-frequency components in the signal, under normal circumstances, we will adopt relatively large electrolytic capacitors.

What is the important role of the capacitor in the circuit board

Capacitor filtering function:

In the power circuit of the circuit board, the current in the circuit will turn the AC circuit into a pulsating DC circuit. Therefore, it is necessary to connect a relatively large-capacity electrolytic capacitor after the rectifier circuit to make full use of its charging and discharging characteristics. . After passing the capacitor, the original pulsating DC voltage can be changed to a relatively stable DC voltage. In the actual situation, because we are in order to prevent the power supply voltage of each part of the circuit board from changing due to load changes, there are generally tens to hundreds of microfarads connected to the output end of the power supply and the power input end of the load. capacitance. Since large-capacity electrolytic capacitors generally have a certain inductance, they cannot effectively filter out high-frequency and pulse interference signals. Therefore, what we need is to connect a capacitor with a capacitance of about 0.001-0.lpF in parallel at both ends to filter out High frequency and pulse interference.

Circuit board capacitors have many functions. The above is just a brief introduction to two more important functions. What kind of function the capacitor plays depends on what circuit the capacitor is placed in. The main function is rectification (coupling), Voltage stabilization depends on the circuit.

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