Analog circuits such as you would find in a radio are quite different from the analog IO used when interfacing with the real world. Reading an analog signal fro

Analog circuits such as you would find in a radio are quite different from the analog IO used when interfacing with the real world. Reading an analog signal from a sensor and acting upon it is trivially simple when compared to building an FM modulator that relies on feedback loops, phase offsets, non-linear junctions and so on. I think there are a lot of people in the world right now who are interested in electronics, and have become fairly good at using digital electronics but still view analog as mysterious and magical. In that case an article like the above will be very interesting to them