Convert ATX Power Supply to Bench Supply

An ATX power supply is designed to step down AC mains voltage into regulated DC voltage rails (+12V, +5V, +3.3V, and -12V) capable of delivering high current. To convert this computer component into a standalone bench supply, the unit must be tricked into turning on without a computer motherboard. This is achieved by connecting the power supply's green PS-ON wire to a common ground (black wire) via a physical power switch. Because switching power supplies generally require a minimum load on the primary 5V rail to regulate properly and stabilize the other outputs, an 8-20 ohm 10-watt power resistor is wired across the 5V line to act as a dummy load. Visual feedback is provided by a power-on LED and a standby LED, each paired with a 330-ohm dropping resistor to limit current and prevent burnout. Fuses and fuse holders are integrated into the output lines to protect against overcurrent conditions and short circuits. The internal DC outputs are then routed out to heavy-duty binding posts mounted on an external enclosure using a terminal strip and internal wiring. Optionally, a DSN-VC288 digital volt-ampere meter can be wired in line to monitor real-time voltage and current consumption. Insulation via heat-shrink tubing ensures all high-current connections remain secure, insulated, and safe from accidental bridging.