The scenario
A hobbyist builds an adjustable bench power supply using an LM317 with a current limiting transistor to safely power prototypes.
What is in this drawing
Read the decisions behind it.
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.
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