How to Make an AC DC Converter: 5 Steps (with Pictures 82%(51)Published: May 24, 2011 Select a transformer. A transformer contains 2 magnetically coupled wire windings. One winding is Wire the primary winding of the transformer to the main AC supply. This transformer connection has Connect the secondary winding of the transformer to a full wave bridge rectifier package. The Attach a smoothing capacitor. Attach a polarized capacitor across the output connections of the See all full list on wikihow How to Convert AC Voltage to DC | Sciencing Add a rectifier to convert the increased or reduced AC to a DC voltage. A bridge rectifier using four diodes converts the alternating (negative and positive) AC voltage to a single-direction DC voltage as alternate diode pairs conduct.