When there is no suitable capacitance replacement, the series and parallel capacitors can be used to obtain the appropriate capacitance. If the voltage value of the capacitance is not enough, the series method can also be used to improve the voltage value. If the circuit needs more than 25V voltage,

Mica capacitance, ceramic capacitor can be replaced by paper capacitance. Ceramic dielectric capacitance can be replaced by mica capacitor and glass-glazed capacitor. Tantalum electrolytic capacitance can be replaced by aluminum electrolytic capacitor.

The rated voltage of the substitute capacitor must be greater than or equal to the rated voltage of the original capacitance or greater than the operating voltage of the actual circuit. The frequency characteristic of the substitute capacitor must meet the frequency requirement of the actual circuit

Fixed capacitance is prone to fault phenomena such as leakage, short circuit, open circuit, inadequate contact of the internal lead of the capacitor (the connection between the pole and the lead) and so on. Especially the electrolytic capacitance, its failure rate is much higher than other