File:Kristaldetector NYW.gif
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Kristaldetector_NYW.gif (550 × 550 pixels, file size: 130 KB, MIME type: image/gif)
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Summary
[edit]DescriptionKristaldetector NYW.gif |
English: On the left a cat's whisker detector, an antique radio component used in crystal radio receivers beginning in the first decades of the 20th century, until about the 1940s. It consists of a semiconducting mineral crystal, often galena (PbS) in a metal cup (bottom), whose surface is touched by a fine metal wire attached to an adjustable arm (top). It forms a crude semiconductor diode which rectified the radio signal in the receiver, extracting the audio signal from the radio frequency carrier wave. Only certain sites on the crystal surface functioned as rectifying junctions, so it had to be adjusted to find a good contact spot by trial and error before each use. The device was very sensitive to the pressure of the wire contact and was easily disrupted by the slightest vibration. If it gets out of adjustment and stops working, it can be replaced by another cartridge. On the right an old type condensor, used in a crystal radio with capacity 200 cm, measured in cm as was usual in that time. |
Date | 19 February 2005 (original upload date) |
Source | Own work (Originally from nl.wikipedia; description page is/was here.) |
Author | Nijdam at Dutch Wikipedia |
Licensing
[edit]Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
Attribution: Nijdam | ||
| ||
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
Original upload log
[edit](All user names refer to nl.wikipedia)
- 2005-02-19 18:56 Nijdam 603×638×8 (172033 bytes) eigen nfoto
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:36, 25 April 2012 | 550 × 550 (130 KB) | Jahoe (talk | contribs) | Cropped off pre-rendered Dutch image caption (making the picture square in the process); white balanced. (A PNG or JPEG version would be desirable.) | |
19:51, 24 March 2007 | 603 × 638 (168 KB) | SieBot (talk | contribs) | {{BotMoveToCommons|nl.wikipedia}} {{Information |Description=eigen nfoto |Source=Originally from [http://nl.wikipedia.org nl.wikipedia]; description page is/was [http://nl.wikipedia.org/w/index.php?title=Image%3AKristaldetector_NYW.gif here]. |Date=2005 |
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