Electronic loads are important tools in the EE arsenal, useful for confirming that power supplies, batteries, and other power sources behave as expected. But their expensive prices motivated YouTuber EEforEveryone to create an open-source solution that relies on off-the-shelf PC components for cooling.

A custom Teensy 4.0-powered PCB takes the place of a PC motherboard, providing such facilities as coulomb counting and voltage and resistance measurement.

Up to four load modules can then be added, each using standard CPU cooling to a peak of around 275 watts. Source code can be found on GitHub, and a burn-in test can be enjoyed in the video below.