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DescrizioneGWP-836531Patent.png
English: Diagram of a crystal radio receiver from G. W. Pickard's 1906 patent on the silicon crystal detectorU.S. Patent 836,531 "Means for receiving intelligence communicated by electric waves". This was the first crystal detector produced commercially, and this diagram is one of the first crystal radio circuits.
Italiano: Schema elettrico radio a galena
Data
Fonte
U.S. Patent 836,531, Greenleaf Whittier Pickard, "Means for receiving intelligence communicated by electric waves", filed: 30 August 1906, granted: 20 November 1906, fig. 1
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