In the experiment builds power supply regulator the that. I will begin with the circuit is simple before. Which in this circuit use a little equipment. Have just zener diode perform regulator and the transistor number BD679 perform enlarge the current tallly go up. For VR1 - 5K values perform to fine the voltage of output. By initial from 0V go to topmost about 12V and pay the Current has usual about 0.7A topmost about 2A depend on transformer with.

The detail is other see take get from circuit picture follow Link the this
http://www.talkingelectronics.com/te_interactive_index.html