An electrolytic detector, a primitive device used to demodulate radio waves in early radio receivers around the turn of the century. It consists of a metal cup containing a dilute solution of
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One of the first radio receivers, built by Russian physicist Alexander Popov as a lightning detector in 1894 Stock Photo - Alamy
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Detector Radio Receiver Edison Flame RF Signal Candle Rectifier Space Charge Set
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Detector (radio) - Wikipedia
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