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AM battery less reciever!

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omidi_sbu

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where can i find some info on an AM reciever with no battery?
 

flatulent

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Several decades ago when germanium transistors were common (they would work on under 1 V) you could put out a long wire antenna with a diode to rectify signals from local MW broadcast stations to power a crystal receiver with audio amplifier for the MW broadcast band.

Crystal receivers without audio amplifiers work best with crystal ear phones (they are more sensitive than magnetic types) which are hard to find these days.
 

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