File:Homemade radio receiver with razorblade.JPG

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Description
English: A homemade "crystal" radio receiver, made in Greece, 1935. This example uses a razor blade and battery carbon to make a crude point-contact diode, instead of the galena cat's whisker detector used in most crystal radios. Receivers using this technique that were constructed by soldiers during World War 2 were also known as "foxhole radios". The battery included in this radio does not provide power to amplify the signal as in modern radios, but is used to apply a small bias voltage to the razor blade detector, to make it more sensitive.
Français : Un récepteur radio a cristal fait maison, se servant d'une lame de rasoir comme détecteur. Fabriqué en Grèce. Des récepteurs employant cette technique ont été construits pendant la guerre ont été également connus en tant que "foxhole radio".
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Source Self-photographed
Author Badseed
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current02:15, 20 February 2009Thumbnail for version as of 02:15, 20 February 20092,340 × 1,656 (1.16 MB)Badseed{{Information |Description=A homemade radio receiver, making use of a razorblade instead of galena to create a point diode. Made in Greece, 19350. |Source=Own photo |Date=February 2009 |Author=Badseed |Permission={{self|GF
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