Building your own switch-mode power supply (SMPS) can be fraught with disappointment and frustration. Even with modern ICs designed to make SMPS design easier, you can still run into issues with PCB layout and circuit efficiency. This project demonstrates how you can build your own SMPS by using a charger you may have stuffed in a drawer somewhere.

Details on this project and more:

Building Blocks: Switch Mode Power Supply

Ramblings of an E-Geek