Building an FM radio from $3 radio chip and an 84MHz ARM Arduino

Re:Building an FM radio from $3 radio chip and an 84MHz ARM ... by jrockway on Sunday October 09, 2022 @06:25PM (#33145895)

FM radio receivers were a staple of those electronic kits I used to play with as a kid. Here's what a quick Google search shows: https://www.electronicsforu.com/electronics-projects/simple-...

The difference in complexity between this and something commercial are extras like decoding the stereo subcarrier and applying the data to the main signal: https://en.wikipedia.org/wiki/FM_broadcasting#Stereo_FM

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Re:Building an FM radio from $3 radio chip and an 84MHz ARM ... by gregsadetsky on Sunday October 09, 2022 @06:48PM (#33146071)

Yeah, I also did electronic kits as a kid, and both learned how to read a diagram thanks to them, but never understood what individual parts did in any circuit.

I “get” I=V/R (I mean not really… I know it exists), but how to go from there to understanding what each capacitor is doing in the simplest of fm circuits?

Is each component doing the equivalent of non-trivial real-time signal processing? How to visualize / think about it?

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