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... based on the TEA5767 radio module.

So this is more a lesson in how to wire things together than it is in how FM radio even works.

The TEA5767 is a full FM broadcast receiver on a chip. So yeah, it’s really just how to wire up that chip, connect it to an audio amplifier (LM4811), etc. If you want to learn how radios work, I’d recommend many of the learning materials out there for amateur radio.

To be fair, I'm not sure if you can demodulate a 100MHz FM signal digitally. DSP at this frequency on an Arduino maybe be infeasible (you need a phase locked loop). I suppose if you used a bandpass + low pass filter you can pull it off but that will be a lot more work still.

The enclosure design was interesting - not 3d printed, unfortunately, but still looks remarkably clean.

And the choice of user interface was interesting to see - a single rotary encoder reminiscent of the days of the iPod.

But, yes, definitely more about how to wire together (physically and digitally) the components of a consumer product than about how FM radio chips work or how to build your own radio from crystals, etc.

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