A full wave rectifier circuit with a diode bridge is used for the rectifier circuit which changes AC into DC. Even if the alternating voltage of the input changes into the positive and the negative, the voltage which is applied to load is always positive by a diode bridge. The voltage which is applied to load is not a clean DC. It is called Ripple voltage.
In this circuit, in order to make the ripple voltage small, the capacitor is connected to load in parallel. Even if the voltage which comes out from a diode bridge becomes small, the DC voltage applied to the load is stabilized by the discharge electricity stored in the capacitor.
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