The main component of the power supply circuit is
LM338K. The circuit
5A power supply with adjustable output voltage from
1.2 to 25V. Circuit is compact, you can see all of the elements except transformer, the printed circuit. Serial element to the cooling body mounted over the aluminum-angular Therefore, lies between the printed circuit boards and regulators LM338K, the other side is mounted on cooling the body with one flat surface.Also you can use a regulator with small fan, I have tested this circuit with computer power supply fan using as a cooling profile with mounting on the heat sink. Its work perfectly when it drive at more than 4.5 A.
Use Potentiometer to change the output voltage can be trimmer potentiometer on a printed circuit or potentiometer on the front panel housing, with two wires connected to the printed circuit boards.
Constructed power supply is also suitable as a power supply for the benches as an experienced electrician, as well as the newcomer.
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