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0-60v / 0-2a variable power supply .
0-30V Variable Power Supply circuit Diagram at 3A - ElecCircuit.com
Variable Power Supply (100mA) Using LM317L Voltage Regulator
Variable Voltage, Current Power Supply Circuit Using Transistor 2N3055
0-60V / 0-2A Variable Power Supply - Schematic Design
0-30V 0-5A regulated variable power supply circuit - ElecCircuit.com