Sgs thomson s ic lm338 in conjunction with a very few passive components is able to produce voltages right from 1 2 to 32 volts.
Dc power supply 0 12v.
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This is a 0 12v variable power supply circuit at 3 amp.
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.
In the circuit with the components value makes the output voltage range of approximately 1 25 to 13 5 volts.
In a normal circuit the general lm350 regulator has a start voltage of 1 25v.