The centre tapped describes the voltage output of a center tapped transformer. The primary terminals of the centre tapped transformer is connected with household supply (220V ac, 50Hz) and output is taken from secondary terminals of the transformer. Step-I: Converting 220v AC into 12v AC using Step Down Transformer Lastly, the output of the capacitor that is pure DC is given to voltage regulator IC 7812 and IC7912 which will regulate the output voltage at 12V and -12V DC, despite the change in input voltage.To filter out these ripples, capacitor of 2200 uf, 25V is used. The output of the rectifier circuit that is DC contains the ripples in the output voltage. Secondly, output of this transformer is given to the rectifier circuit, which will convert the ac supply into dc supply.Firstly, 220V AC is converted into 12V AC by using simple step-down (220V/12V) transformer.This can be achieved in simple three steps: The objective of this project is 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.

Multisim 12 wire size