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Variable Voltage, Current Power Supply Circuit Using Transistor 2N3055
0-300V Variable High Voltage Power Supply
Hobby Electronic Circuits: Variable 0 to 300 Volts, Regulated Power Supply
0-30V Variable Power Supply circuit Diagram at 3A - ElecCircuit.com
Modifying power supply circuit for either higher current &/or voltages
0-30V 0-5A regulated variable power supply circuit - ElecCircuit.com
LM317 with pass transistor circuit regulators | ElecCircuit.com