SciGuy writes "I am a physics teacher for 9th graders. I really want to teach them modern radios (something beyond the light bulb and battery). My hope is for a project that: 1) Is fun 2) Teaches about circuits that are germane to their life. 3) Doesn't rely too heavily on a black box microcontroller. particular components would believably be better. (I realize that #2 and #3 are no doubt contradictory. They will already be data processing in my class but I want them to intuitive the circuitry behind modern tech.) 4)It must be as cheap as possible. Yay, public school. Unless some of the parts can be scrounged or found at home, I would imaginably want to keep the project around $5." What would you build?

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Mark