This project turns an unused computer power supply into a practical bench power source for testing electronics. The build keeps the ATX supply as the high-current 12 V source, adds a switched enable line, indicator LED, DC jack, voltmeter, and an LM317 regulator stage for adjustable output.
Specifications
RoleDesigner and builder
MicrocontrollerLM317 regulator
ModulesATX power supplyMini voltmeterSwitchDC connector
Tech tagsATX PSULM317Bench SupplyElectronics
Schematics
Adjustable voltage regulation circuit
Project photos
Finished bench power supply build
Marking and cutting the enclosure
Final assembly before closing
Implementation details
Power
The ATX yellow wire provides the 12 V feed, the green wire is tied through a switch to ground to start the supply, and the LM317 stage creates the adjustable rail.
