This was the very first electronic circuit I assembled 40 years ago. Now, in 2020, I designed it properly.
I hope it would help someone of the next generation to learn the basics of electronics more easily.
Small things I designed for fun, or used for learning new things or testing other prototypes.
Full documentation, all design files, Gerber files, 3D models, etc. are downloadable from here.
Everything is licensed under Creative Commons Attribution-ShareAlike (CC-BY-SA) license, which means you can use it for anything you want to, as long as give me appropriate credit. In practice it means you keep the "https://pintergabor.eu" link printed on the PCB, and do not delete it from the documentation either.
As it is impossible to make only a few samples of these small cards, I have plenty of bare PCBs available in the shop for ridiculously low prices.
Measuring the waveform of the current is important for debugging power converters, and to improve efficiency and reduce EMC radiation of every circuit. High-end oscilloscopes have current probes, but these are very expensive. This little and cheap board helps those, who cannot afford them.
The board can also be used as an evaluation board for INA199.