LM317 adjustable integrated voltage regulator circuit diagram

As shown in the figure, LM317 is a common adjustable integrated voltage regulator with a maximum output current of 2.2A and an output voltage range of 1.25~37V. The circuit connection is as follows:

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The voltage reference between pins 1 and 2 is 1.25V. To ensure the output performance of the voltage regulator, R1 should be less than 240 ohms. Changing the resistance of R2 can adjust the regulated voltage value. D1, D2 are used to protect LM317 .