LabPSU-Mini

Modular desktop power supply with selectable voltage rails and microcontroller monitoring

Desktop PSU Project 🔌🧠

A modular, 3-voltage desktop power supply (9V / 5V / 3.3V) with:

• LM2596-ADJ 4pin buck converters
• Arduino Nano for temperature monitoring
• Rotary voltage selector
• Active cooling + heatsinks
• 3D printed ABS enclosure

---

🔧 Features

• Rotary switch-selectable voltage rails
• Internal fan cooling system
• PD-ready, low profile power input
• All components enclosed in heat-tolerant ABS

---

🧱 Build Log

Enclosure

• Designed Baseplate with vent for 120mm fan.
• Designed buck converter brackets in FreeCAD

Electronics

• Created front panel layout (voltage oled and rotary switch)
• Add OLED display for voltage/temp readout
• Mount microcontroller inside

Software

• Create voltage and temprature readout lcd software with arduino nano

Initial Baseplate Images

This will eventually have dovetails drawn, and a ventalation hole (the 120mm square hole), ill probably cut it down a lot so the fan can screw in.

---

📐 Folder Structure

• enclosure/ → 3D models (FreeCAD, STL)
• electronics/ → Schematics (KiCad), PCB layouts
• firmware/ → Arduino/Pico code
• images/ → Renders, wiring diagrams, final photos
• docs/ → Reports, notes, datasheets

---

🧾 Licensing

• 
  Code (firmware/) is licensed under the MIT License.

• 
  Design files (enclosure/, electronics/, images/) and documentation are licensed under
  Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).
  LabPSU-Mini © 2025 by Alexander Rapino is licensed under CC BY-SA 4.0.

Please attribute accordingly and respect the terms when remixing or redistributing.