In this tutorial i will show you how to make simple +12/-12 volt transformer based Dual Voltage Power Supply circuit. You can watch the video which is embedded in this step for construction, parts list, circuit diagram & testing or you can continue reading the post for further details.

Step 1: Parts & Affiliate List

***Parts & Affiliate List***

1 * Transformer 240 to 15-0-15 volt - https://goo.gl/eDMmG4
4 * 1n4001 - https://goo.gl/4vC5FX
2 * 2200uF/25v
2 * 10uF/25v
1 * 3.3k
1 * Red Led
2 * Heat Sink - https://goo.gl/gvAhgN
2 * 3 pin Terminal Block - https://goo.gl/1bbFdc
1 * 7812 - https://goo.gl/dYnUST
1 * 7912

***Affiliate & Support Links***

If you wish to support my videos then you can do by using my affiliate links given below, this way i get small commission for your purchases.

Step 2: Circuit Diagram & Other Details

Construct the circuit as shown in the circuit diagram.
For making this project one of the main component is the center tapped transformer. The transformer i used is of the rating 240v to 12-0-12v. The recommended rating would be 240v to 18-0-18v transformer.

Note : Sometimes the transformer you purchase outputs more then the specified value (which happened in my case), so be careful while choosing the transformer.

The C1 & C2 capacitor acts as the smoothing capacitor, this is to even out if there is any fluctuation. You can also add an bypass capacitor after the C1 & C2 to remove any AC noise which is not showed in my circuit. Next the two voltage regulators, The 7812 gives positive 12v & 7912 gives you -12v. This can be done with other variants too