What are the precautions for capacitor selection and use

What are the precautions for capacitor selection and use?

1. Generally, paper and polyester capacitors can be used when the low-frequency coupling or bypass and the electrical characteristics are low; mica or porcelain capacitors can be used in high-frequency and high-voltage circuits; electrolytic capacitors can be used in power filtering and decoupling circuits.

2. In the oscillation circuit, delay circuit and tone circuit, the capacitor capacity shall be consistent with the calculated value as much as possible. In all kinds of filtering and network (frequency selection network), capacitor capacity is required to be accurate; in decoupling circuit and low-frequency coupling circuit, the requirements for the same two levels of accuracy are not very strict.

3. The rated voltage of capacitor shall be higher than the actual working voltage, and there shall be enough room. Generally, capacitor with voltage withstand value more than twice the actual working voltage shall be selected.

4. The capacitor with high insulation resistance and small loss shall be selected preferentially, and the use environment shall be paid attention to.