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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 antenna wire, right, has a clip to attach to metal objects such as a bedspring, which serve as an additional antenna to improve reception.
The most common type was the so-called cat's whisker detector, which consisted of a piece of crystalline mineral, usually galena (lead sulfide), with a fine wire touching its surface. [1] [4] [5] The "asymmetric conduction" of electric current across electrical contacts between a crystal and a metal was discovered in 1874 by Karl Ferdinand ...
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]
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).
Cat's whiskers may also refer to: Cat's-whisker detector, an electric component; Orthosiphon aristatus, a plant commonly known as cat's whiskers
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
Image credits: TigressSnow But wait, it gets even weirder. A cat’s purr isn’t just for show—it’s actually a built-in healing mechanism. Cats have a unique frequency range for their purrs ...
The detector stage recovers the information from the radio-frequency signal, and produces the sound, video, or data that was impressed on the carrier wave initially. Detectors may be as simple as an "envelope" detector for amplitude modulation , or may be more complex circuits for more recently developed techniques such as frequency-hopping ...
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