상황
Build a variable DC power supply for prototyping, providing a main adjustable output up to 15V and a fixed 5V USB port for powering microcontrollers.
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01
Using LM317 for adjustable output with potentiometer voltage divider
02
Adding 7805 regulator for fixed 5V USB output
When you need a bench power supply from AC mains with both variable and fixed 5V outputs.