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If you are planning to build a 0 to 12 volt dc power supply unit for your work bench this article may specifically help you sgs thomsons ic lm338 in conjunction with a very few passive components is able to produce voltages right from 12 to 32 volts the variations are done smoothly through a discrete potentiometers to obtain wide voltage ranges. The picture above is the circuit diagram of the power supply it is actually very similar to most of the lm317 based power supply with some key difference one of them is the extra pair of 470 uf capacitor and 1n4007 diodes below the main bridge rectifier it is a charge pump circuit used to create a low power negative dc voltage source. In this ac to dc 12v 0 12v regulated dual power supply circuit primarily 220v ac is converted into 12v ac by using step down 220v 12 0 12v transformer secondly the output of this transformer is given to the rectifier circuit which will convert the ac supply into dc supply. 1a variable power supply 0 to 12v circuit diagram circuit and wiring diagram download for automotive car motorcycle truck audio radio electronic devices home and house appliances published on 04 jul 2014. In this project we construct a dual power supply circuit to convert 220v ac supply in to 12v and 12v dc supply that is why it is named dual power supply as we get positive and negative 12v power supply at the same time