상황
A hobbyist builds an adjustable bench power supply using an LM317 with a current limiting transistor to safely power prototypes.
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01
Choose Rsense (0.2Ω) to set current limit to approximately 3A (0.6V Vbe drop)
02
Use a 5kΩ potentiometer for R2 to enable voltage adjustment from 1.2V to 25V
03
Include protection diodes D5 and D6 to prevent capacitor discharge through the regulator
Suitable for low-power lab supplies where adjustable voltage and current limiting are required for safe testing.