Radio - receivers & field meters
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Crystal Radio receiver. Listen radio without any power supply! It powers itself by radio wave energy.
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visits: 27688
author: Andy Collinson
visits: 22450
author: Kyriakos Kontakos
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A bright lamp flashes in sychrony with the lightning bolts indicating the proximity and intensity of the storm.
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author: Jonathan Filippi
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author: Andy Collinson
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Audio
