LM317 Power Supply Circuit

The output is adjustable between 1.25 and 13.5 Volts with a maximum current limit of 1.5 Amps. The LM317K regulator is internally protected from current and thermal overloads. A heat sink will be required for most applications however.

PARTS LIST
R1	220 Ω
R2	2 KΩ Variable Resistor
C1	3300 µf 50v
C2	10 µf 25v
C3	1 µf 25v
C4	0.1 µf
D1	100V 5A bridge rectifier
D2	IN 4007
D3	IN 4007
IC1	LM 317
T1	18 VAC 2AMP
F	250mA

The values of R1 and R2 are not critical but R1 should not be larger than 270 ohms. For a fixed voltage output R2 should be selected to give the desired maximum output voltage for a given R1 value. See the calculation on the drawing.

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