DIY Mini Lab Power Supply

A bench power supply is extremely useful for electronics hobbyists, but they can be expensive when purchased from the market. In this Instructable, I will show you, how to make a mini-lab power supply with a limited budget. It is a great DIY project for beginners as well as anyone interested in Electronics.

The Power Supply is based on XL4015 DC-DC buck converter module. This module can provide an adjustable output-voltage from about 1.4V, up to the input voltage (nearly) and current output from 0mA to 5A. It only requires only a DC power supply with a voltage somewhere between 12-30V.

The inspiration for this project is from Chordless Lab Power Supply

The power supply can be used for the following purposes:

1. Variable Power Supply

2. Battery Charger

3. Constant Current LED Driver

4. Solar Charger Controller

Instructables Link: https://www.instructables.com/DIY-Mini-Lab-Power-Supply/

Specifications:

1. Input voltage range:5-36VDC

2. Output voltage range:1.25-32VDC adjustable

3. Output current: 0-5A Output power: 75W

4. Output ripple: 50mV (max)

5. In-built thermal shutdown and short circuit protection

Components Used:

1. XL4015 Buck Converter ( Amazon )

2. Volt-Amp LED display ( Amazon )

3. 2 x 10k Precision Potentiometer ( Amazon )

4. 2 x Binding Posts ( Amazon )

5. DC Jack (5.5mm x 2.1mm) ( Amazon )

6. 2 x Rocker switch ( Amazon )

7. Fuse Holder ( Amazon )

8. Fuse ( Amazon )

9. Heatshrink ( Amazon )

10. 20AWG Wires ( Amazon )

11. Heatshrink Tube ( Amazon )

12. 12-30V DC Power supply ( Amazon )

Tools Used:

1. Soldering Iron ( Amazon )

2. Wire Cutter / Stripper ( Amazon )

3. 3D printer ( Amazon )

4. Hot Air Blower ( Amazon )

Schematic Diagram:

Download the Schematic Diagram:

Schematic_XL4015 Lab Power Supply_2020-1

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Download • 418KB

3D printed Enclosure Files:

Download the .STL files from Thingiverse