Benchy - Repurposed PC Power Supply

Why I built Benchy

Modern desktop computers require much more power than they did ten years ago. An older computer power supply may no longer be suitable for a new computer, even though it still works perfectly well. Instead of throwing away useful hardware, I repurposed an old computer power supply as a practical bench power supply for electronics prototyping and testing.

I call the project Benchy, and this version is Kira 03. My goal was to create a compact, organized enclosure that makes the power supply easier to use on a workbench while extending the useful life of existing hardware.

How it works

The original computer power supply provides the electrical power. An SK120 module, Arduino Nano, and relay are integrated into the project for the front-panel interface and control functions. The parts are mounted inside a custom enclosure that I designed for 3D printing in PLA.

The enclosure keeps the components together, provides a clean front panel, and turns the reused hardware into a dedicated workshop tool. The design uses common M2 and M3 screws so it can be assembled and serviced with readily available hardware.

Main components

• Retired but working computer power supply
• SK120 module
• Arduino Nano
• Relay module
• Custom 3D-printed PLA enclosure
• M2 and M3 screws
• Wiring and connectors appropriate for the selected power supply

Design and construction

I measured and arranged the parts, designed the enclosure, printed it in PLA, and assembled the electronics into the finished unit. The enclosure model and project documentation are published so other makers can study the design, modify it for their own components, and build their own version.

Add a photo of the parts or an assembly-stage photo here.

Result

Benchy gives an older computer power supply a useful second life as a compact source of power for electronics work. The project combines reuse, electronics integration, and 3D design in a device that is useful beyond its original purpose.

Add your best finished-project photo here.

Open-source files

The enclosure model, build information, parts list, and additional photographs are available here:

• GitHub: https://github.com/Syren0914/benchy-kira-03
• Project photographs: https://drive.google.com/drive/folders/1a5vY3R4KkWWrwnvo-AKPjcpfRcpAucLN

Safety

Computer power supplies contain hazardous mains voltage and can store energy after being disconnected. Only people with suitable electrical knowledge should open or modify one. Disconnect power before working on the project, insulate exposed conductors, provide strain relief, and verify every output with a multimeter before connecting equipment. Output current limits depend on the specific donor power supply.