ELECTRONICS
Adjustable DC Power Supply
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CASE ANALYSIS
Scenario
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.
Key decisions
- Using LM317 for adjustable output with potentiometer voltage divider
- Adding 7805 regulator for fixed 5V USB output
When to reuse this
When you need a bench power supply from AC mains with both variable and fixed 5V outputs.
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circuit-diy-5v-15v-adjustable-dc-power-supply-with-usb-and-barrel-ja