<<< I had a primitive radio with earplugs that enabled me to hear top 40 music from powerful stations all over the east coast. It was some kind of science project that didn't even need batteries. It had an alligator clip that grounded the radio, after which I got a weak radio signal. It changed channels by moving a metal lever across an open coil! It was shaped like a Buck Rogers style rocket ship >>>


That's a crystal radio. Back when soda bottles had metal caps, the cap could be filled with lead and with just a few parts, including a safety pin, you could make one in less than 10 minutes. The same could be done with safety Razor blades. They were also called foxhole radios and are about as simple as it gets.


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Last edited by Charlie Fogle; 11/30/18 03:01 AM.
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