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There are polarity electrolytic capacitors in the power circuit or if, low frequency circuit power filter, decoupling, signal coupling and time c***tant setting, DC isolation and so on. The anode (positive electrode) should be connected with the positive extreme of the power supply voltage, and the cathode (negative electrode) should be connected with the negative extreme of the power supply voltage when used as a filter capacitor in the DC power supply circuit. Otherwise, the capacitor will be damaged. Non-polarity electrolytic capacitors are usually used in frequency divider circuit, s-correction circuit and starting circuit of single-phase motor.