Simple electronic circuits
See Many simple electronic circuit that is very important on this sites. My friends used to say the large projects, from small several circuits to combinations.
0-12v variable power supply at 3A
In a normal circuit, the general LM350 regulator has a start voltage of 1.25V. But this circuit is special that start of 0-volts. We use only one IC and a few other components. So cheap and easy for you.