File:Silicon crystal detector.jpg
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Summary
| Description |
English: Silicon point-contact crystal detector from 1906, invented by Greenleaf Whittier Pickard. This was the first silicon diode. The brass contact point touched the surface of a crystal of silicon to form a crude Schottky junction. Silicon did not require the delicate cat's whisker contact of the galena detector. The flat piece of silicon is embedded in solder in the shallow metal cup at bottom, which can be moved horizontally to try different contact points. There is a helical spring inside the barrel of the device which puts pressure on the contact. |
| Date | |
| Source | Downloaded 2010-03-02 from Walter Wentworth Massie, Charles Reginald Underhill (1908) Wireless Telegraphy and Telephony Popularly Explained, D. Van Nostrand Co., New York, p.31, fig.16 on Google Books |
| Author | Walter Wentworth Massie and Charles Reginald Underhill |
| Permission (Reusing this file) |
Public domain in USA - published in USA prior to 1923 |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:01, 3 May 2021 | | 677 × 694 (127 KB) | Materialscientist | FFT |
| 06:01, 8 March 2010 |  | 677 × 694 (66 KB) | Chetvorno | {{Information |Description={{en|Silicon point-contact crystal detector from 1909. A variant of the Wikipedia:cat's whisker detector, this was used in early Wikipedia:crystal radio receivers during the first few decades of radio. The brass cont |
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