Svenska: Kristallmottagare, kristallen och avkännaren av märke "Ideal" D.R.P. (Deutsches Reichs Patent)
English: Cat's whisker detector, an antique radio component, from a Swedish
crystal radio receiver. It consists of a fine wire attached to an adjustable arm that touches the surface of a crystal of
galena (lead sulfide). It was used in crystal radios from about 1906 to World War 2. It functioned as a crude
semiconductor diode, rectifying the AC radio signal to extract the audio (sound) signal from the radio frequency carrier wave.
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{{Information |Description={{sv|1=Kristallmottagare, kristallen och avkännaren D.R.P. (Deutsches Reichs Patent)}} |Source=Uppladdarens egna verk (uploader's own work) |Author=
Holger.Ellgaard |Date=2008 |Permission=yes |other_vers
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