TIL about crystal radio, a radio receiver made with simple parts that needs no external power source, all it needs is a radio signal to produce sound.


TIL about crystal radio, a radio receiver made with simple parts that needs no external power source, all it needs is a radio signal to produce sound. https://en.wikipedia.org/wiki/Crystal_radio AporiaParadox June 28, 2019 at 07:01AM

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