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Dc power supply 0 12v.
The variations are done smoothly through a discrete potentiometers to obtain wide voltage ranges.
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In the circuit with the components value makes the output voltage range of approximately 1 25 to 13 5 volts.
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.
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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.