It is often useful to have a rectifier circuit that is capable of producing a dc voltage that is higher than the zero-to-peak voltage of the ac source. Although the usual procedure is to use a transformer to step up the voltage before the rectifier stage, an alternative approach is to use a voltage multiplier circuit.

Warning !!!

-Use the higher capasitor voltage capacity

-Use the higher Diode voltage capacity

-If Vin = 220V the Vout = 4x220 = 880 Volt !!!!