DIY Desktop Fridge

YouTube Tutorial

Introduction

Here’s how to build something sleek, functional, and satisfying.

Transform everyday materials into a mini-fridge for chilling drinks right at your desk or in your workshop.
This project uses a 12V DC power supply and a Peltier module to cool the box by up to 25°C, making it perfect for school exhibitions, tech demonstrations, or hobby builds.

Materials Required

You’ll need the following components and tools:

• Peltier Module (TEC1-12706)
• 12V CPU Fan × 2
• 12V LED Strip
• 12V 10A Power Supply
• Heat Sink × 2
• Thermocol Ice Box
• Thermal Paste
• Hot Glue Gun
• Magnet (for door latch)
• Sticky Tape & Cutter

Step-by-Step Instructions

Follow these steps carefully to build your mini fridge:

1. Mount the Heat Sink
   Attach one heat sink to the outer back wall of the thermocol ice box using hot glue.
   This will help disperse the heat generated by the Peltier module.
2. Install the Inside Fan
   Fix a 12V CPU fan on the inner wall of the box to circulate cold air evenly.
3. Add Interior Lighting
   Stick a strip of 12V LED lights inside the box to illuminate the interior.
4. Make Wire Cutouts
   Cut small holes at the back for power wires.
   Seal all gaps with hot glue to prevent cold air from escaping.
5. Mount the Peltier Module
   Apply thermal paste to both sides of the Peltier module.
   Sandwich it between the two heat sinks (one inside, one outside), then glue it firmly in place.
6. Attach Outer Fan
   Fix the second CPU fan onto the external heat sink.
   This fan helps cool the hot side of the Peltier for efficient performance.
7. Wire Everything
   Connect all components as per the circuit diagram.
   Ensure polarity is correct before powering it on.
8. Create a Door
   Cut three edges of the ice box lid and tape one side to form a simple hinged door.
9. Add a Magnetic Latch
   Drill a small hole and attach a magnet using hot glue for a neat closing mechanism.
10. Power it Up & Chill!
    Plug in the 12V power supply, turn it on, and watch your mini fridge start cooling instantly!

Circuit Diagram

Connect the Peltier module, fans, and LEDs in parallel to the 12V power line, ensuring proper polarity.

A 10A adapter is recommended to provide stable current for cooling efficiency.

Final Notes

This project demonstrates how thermoelectric cooling works using a Peltier module and basic electronics.

It’s a perfect combination of creativity, functionality, and science — resulting in a usable mini fridge.

Intended: Experiment with better insulation, add a temperature controller, or redesign the case for improved efficiency.
It’s a fun and rewarding project that blends DIY engineering with real-world utility.