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.

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

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 and current output from 0mA to 5A. It only requires only a DC power supply with a voltage range between 12-30V. I have used a 24V/3A DC adapter.

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

Components Used:

1. XL4015 Buck Converter: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

2. Volt-Amp LED display: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

3. 2 x 10k Precision Potentiometer: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

4. 2 x Binding Posts: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

5. DC Jack (5.5mm x 2.1mm): https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

6. 2 x Rocker switch: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

7. Fuse Holder: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

8. Fuse: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

9. Heat Sink: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

10. 20AWG Wires: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

11. Heatshrink Tubing: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US

12. 12-30V DC Power supply: https://www.amazon.com/Organizer-Lithium-Battery-Converter-Constant/dp/B07V7F5K8T/ref=as_li_ss_tl?crid=1B0FW64XZ1QBU&dchild=1&keywords=xl4015+dc-dc+buck+converter&qid=1607759569&sprefix=xl4015,aps,451&sr=8-3&linkCode=sl1&tag=opegreene-20&linkId=86510e9a92c72bdb988088facde1bc3f&language=en_US