Re: Battery-less audio amplifier
Both these approaches have this in common - they use EM energy from another source to provide power. Only Herald1360's approach uses energy from somewhat further up in the frequency spectrum.
Of course, to keep on-topic, you could only use one solar cell, else you'd have a (solar) battery.
Micropower operation is fascinating, however I'd guess that the micropower op-amp could not drive more than a crystal earpiece without significantly increasing its power demand.
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