I saw a TIL post talking about a radio station that transmitted so much power that people nearby could hear it in their furniture. How is that even possible? I though speakers were made to that audio could be correctly relayed yet a spring mattress can play audio?
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AM radio only needs a very simple circuit to “demodulate” the audio signal; a rectifier. A poor quality rectifier circuit can sometimes be created quite by accident, such as by having two dissimilar metals in contact, or a metal and a conductive solution. Metal fillings and saliva can do it!
If the radio signal is very strong, it can overcome the lousy efficiency of such a circuit and make things vibrate just like a speaker would.
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