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DC Power Supplies (Direct-Current)

2N3055 Variable DC Voltage Power Supply
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Variable-voltage DC power supply circuit. The output DC voltage is adjustable from 0.7-24V, with current limiting range from 50mA up to 2 Amps. Main transistor is the 2N3055.
LM317 1-25 Volts Variable DC 1.5 Amp Power Supply
An extremely simple and cheap DC power supply with variable voltage (1.2-25 Volts) control. The circuit uses an LM317 integrated voltage regulator Ic.
Variable DC Power Supply (1-30 Volts, 5 Amps). LM338K Regulator
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A very simple variable power supply with a DC output voltage adjustable from 1-3- Volts, with a maximum DC current of 5 Amps. Uses LM338 DC voltage regulator IC.