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.

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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