Structure and characteristics of several kinds of commonly used capacitors(II)

4, aluminum electrolytic capacitor: it is made of aluminum cylinder as negative electrode, inside containing liquid electrolyte and inserted into a curved aluminum strip as positive electrode. It is characterized by large capacity, but large leakage, poor stability, positive and negative pole, suitable for power filter or low frequency circuit, when used, the positive and negative electrodes should not be connected back.

         5, Mica capacitor: the electrode plate is made of metal foil or sprayed silver layer on the mica chip. The electrode plate and mica are laminated one by one, and then die cast in Bakelite powder or sealed in epoxy resin. Its characteristic is: the dielectric loss is small, the insulation resistance is big. Low temperature coefficient, suitable for high frequency circuit.