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It's probably been done already, but here goes:

How about making a two part receiver, one stage for the normal detection
and tuning, the other a really wide band receiver with a conversion
portion in it.

That part would collect any and all signals hitting it and convert it to
a very small dc output. That in turn could be used to power an amplifier
for the audio of stage one and then work a small speaker.

Surely there should be enough broadcast power over the entire AM band,
that, if collected and rectified, would drive a 2 inch speaker at very
modest levels.


mike



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