Aluminum electrolytic capacitors are made of an aluminum cylinder as a negative electrode, which contains a liquid electrolyte and is inserted into a curved aluminum strip as a positive electrode. It is also necessary to undergo DC voltage treatment to form an oxide film on the positive electrode plate as a medium. It is characterized by large capacity, but large leakage, poor stability, positive and negative polarity, suitable for power filter or low-frequency circuit. When using, do not connect the positive and negative terminals.
Aluminum electrolytic capacitor body marked with capacity and voltage, these two parameters are very important, is the most basic content of the selection of capacitors. In the actual capacitor selection, where the current changes quickly, a larger capacity capacitor should be used, but not the larger the capacity, the better, first of all, the larger the capacity, the cost and volume may rise, in addition, the larger the capacitance, the larger the charging current, the longer the charging time. These are the practical application to be considered in the selection.
