File:Blaupunkt Rundfunkdetektor - ca. 1938.jpg
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English: Plugin crystal detector used in a radio receiver made by Blaupunkt, Germany, ca. 1938. An early form of diode, it's function was to rectify the radio wave, extracting the audio (sound) modulation signal. This is a "carborundum detector", using a crystal of silicon carbide (then called carborundum) clamped between two spring-loaded contacts. Carborundum was used in crystal radios, and also in some vacuum tube radios between 1920 and 1950 because it was more sensitive than vacuum tube detectors. Museum für Kommunikation, Frankfurt, Germany. Photo by Maximilian Schönherr with help from Lioba Nägele.
Deutsch: Rundfunkdetektor mit Kristall, Blaupunkt, ca. 1938. Die Berliner Firma setzte damals auf jedem Gerät zur Markenprägung einen blauen Punkt ein, hier auf der Unterseite des Geräts zu sehen. Museum für Kommunikation, Frankfurt. Foto von Maximilian Schönherr, unterstützt von der Referentin für Nachrichtentechnik im Museumsdepot Heusenstamm Lioba Nägele. |
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| Source | Own work |
| Author | Maximilian Schönherr |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 20:17, 12 January 2015 | | 1,333 × 2,000 (261 KB) | Maximilian Schönherr (talk | contribs) | {{Information |Description ={{en|1=Radio waves detector with crystal unit, made by Blaupunkt, Germany, ca. 1938. Museum für Kommunikation, Frankfurt, Germany. Photo by Maximilian Schönherr with help from Lioba Nägele.}} {{de|1=Rundfunkdetektor mi... |
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