File:CatWhisker.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

CatWhisker.jpg ‎(426 × 274 pixels, file size: 28 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description
English: A galena cat's-whisker detector, an early radio wave detector used in crystal radio receivers from about 1905 to the 1940s. The fine metal wire attached to the adjustable arm touches the face of a natural semiconducting crystal of galena (lead sulfide) in the capsule at right. The contact forms a PN junction making a crude semiconductor diode. In a crystal radio its function is to rectify the alternating current radio signal, extracting the audio (sound) signal from the radio frequency carrier wave. Only certain sites on the crystal surface function as rectifying junctions, so the device had to be adjusted before each use by dragging the wire across the crystal to find a "sweet spot".
Source en wikipedia
Author JA.Davidson

Licensing

[edit]
The copyright holder of this work allows anyone to use it for any purpose including unrestricted redistribution, commercial use, and modification.

Please check the source to verify that this is correct. In particular, note that publication on the Internet, like publication by any other means, does not in itself imply permission to redistribute. Files without valid permission should be tagged with {{subst:npd}}.

Usage notes:

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current16:10, 23 April 2007Thumbnail for version as of 16:10, 23 April 2007426 × 274 (28 KB)Kauczuk (talk | contribs){{Information |Description= Cat's-whisker detector |Source= en wikipedia |Date= |Author= [http://en.wikipedia.org/wiki/User:JA.Davidson JA.Davidson] }}

You cannot overwrite this file.

The following page uses this file:

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:CatWhisker.jpg&oldid=851116113"