The NucleoTNC is a breadboard implementation of our commercial product, the Mobilinkd TNC3, designed to encourage experimentation and learning in amateur radio, electronics, digital signal processing and software engineering.
The TNC can be built with about $25 in parts. Build instructions, schematics in KiCAD format, and source code are available from our public GitHub repo.
Go here to see how to make your own TNC for $25: https://nbviewer.jupyter.org/github/mobilinkd/NucleoTNC/blob/master/Build/NucleoTNC.ipynb
If you make this project, we would love to see photos of your build on the Mobilinkd group: https://groups.io/g/mobilinkd