Re: Battery-less audio amplifier
The modern name for this is energy harvesting, and people are looking at it as a way of powering remote sensors etc. Whether the broadcasters, mobile phone firms etc. are happy about this remains to be seen.
The danger I see is that as well as extracting energy which was meant to end up in the front-end of a receiver (so possibly reducing range for legitimate users) it could also radiate interference (rusty bolt effect on a big scale if everyone starts doing it).
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