DIY Mini Lab Power Supply
Updated: Dec 12, 2020

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:
3D printed Enclosure Files:

Download the .STL files from Thingiverse