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jonoff t1_ixpfx5n wrote

Reply to comment by NamityName in Alarm clock lasted over two decades and somehow knows when daylight savings is still by VapeMySemen

It's not the sound waves nor speaker that matters here, but what powers the diaphragm of that speaker. The speaker's very small electric coil puts out EM waves at a harmonic frequency the device picks up. Pretty neat trick.

Building just a wire loop greatly improves the signal without any audio. http://www.jrcomputing.com.au/Set_Watch/Set_Watch_Manual.html

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ARoyaleWithCheese t1_ixplk4m wrote

This 100% reads like one of those "charge your phone in the microwave" pranks. Of course it's not, but it does come across just as ridiculous if you don't understand the science behind it. Suddenly it seems not that crazy people would fall for hoaxes like that.

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Liquidretro t1_ixs94dg wrote

Thanks for the explanation, I have always wondered how this works exactly

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