Lm317 Power Supply Schematic. Adjustable voltage dc power supply using lm317 voltage regulator. The output voltage of this basic regulator is adjusted with the potentiometer connected to the regulator pin 3 adj.
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The lm317 or lm117 series of adjustable 3 terminal positive voltage regulators is capable of supplying in excess of 1 5a over a 1 2v to the 37v output range and has many special features that i like are. See red box on the diagram. 1 radial electrolytic capacitor 10 uf 1 axial ceramic capacitor 0 1 uf 1 2mm barrel power plug 2 1n4001 rectifier diodes the 02s work as well 1 to 220 heatsink 1 560 ohm resistor grn blue brn gold 1 470 ohm resistor yel vio.
The lm317 ic has many features such as current limiting thermal protection and safe operating area protection.
It can also provide float operation for high voltage application. The adjustable lm317 power supply is ready. Huge heat sink is required in this circuit as 2n3055 transistors produce large amount of heat at full load. This 20 amp variable power supply varies its output voltage from 1 5 to 15 volts and is based on the well known variable voltage source configuration where only the lm317 voltage regulator is used.
