Re: Battery-less audio amplifier
You could connect two crystal sets in series, provided you reversed the diode in one of them. You would need two antennas, and a minor rethink of the arrangements for impedance matching of the output.
If the antennas were really large, so extracting a serious proportion of the available energy, then you might do better to arrange them as a beam instead. Otherwise they might simply share the energy between them.
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