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Swedish crystal radio from 1922 made by Radiola, with earphones. The device at top is the radio's cat's whisker detector. A second pair of earphone jacks is provided. 1970s-era Arrow crystal radio marketed to children. The earphone is on left.
The foxhole radio was a crude crystal radio which used a safety razor blade as a radio wave detector with the blade acting as the crystal, and a wire, safety pin, or, later, a graphite pencil lead serving as the cat's whisker. [3] The foxhole radio, like a mineral crystal radio receiver, had no power source and ran off the power received from ...
Galena cat whisker detector used in early crystal radio Precision crystal detector with iron pyrite crystal, used in commercial wireless stations, 1914. The crystal is inside the metal capsule under the vertical needle (right). The leaf springs and thumbscrew allow fine adjustment of the pressure of the needle on the crystal.
Recreation of the 1907 experiment by H. J. Round on the observation of electroluminescence from a point contact with a carborundum (silicon carbide) crystalIn some later experiments with cat's whisker detectors using a variety of substances, he passed current through them and noticed that some gave off light – the first known report of the effect of the light-emitting diode (LED).
TOTAL: 95/100 Since the Litter-Robot 3 Connect changed my life (no, seriously, just read my full review), I was ecstatic to try Whisker’s newest model, the Litter-Robot 4 ($699). Just like the orig
"The first true detector rectifier was also the first true solid state device, affectionately known as the cat's whisker detector of crystal radio fame", Braun, McDonald, 1983, Revolution in Miniature: The History and Impact of Semiconductor Electronics, p.11
So far over 3,000 cats have been adopted through Crumbs & Whiskers and more than 4,000 cats have been saved from euthanasia. The organization has also donated over $50,000 to charity.
Litter Robot Since the Litter-Robot 3 Connect changed my life, I was ecstatic to try Whisker’s newest model, the Litter-Robot 4. Just like the original, the updated version is an automatic self ...