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DIY Variable Power Supply With Adjustable Voltage and Current

Variable Voltage, Current Power Supply Circuit Using Transistor 2N3055

LM317 with pass transistor circuit regulators | ElecCircuit.com

Questions about a simple variable power supply | Electronics Forums

Variable Power Supply using LM317 Voltage Regulator

Adjustable Power Supply Circuit Diagram

If you want a Dual Variable power supply circuit that covers the most

AC variable power supply, 0-30V 3A

Hobby Electronic Circuits: Variable 0 to 300 Volts, Regulated Power Supply