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  2. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    A crystal radio receiver, ... A large number of prefabricated novelty items and simple kits could be found through the 1950s and 1960s, and many children with an ...

  3. Crystal detector - Wikipedia

    en.wikipedia.org/wiki/Crystal_detector

    Crystal radios had no amplifying components to increase the loudness of the radio signal; the sound power produced by the earphone came solely from the radio waves of the radio station being received, intercepted by the antenna. Therefore, the sensitivity of the detector was a major factor determining the sensitivity and reception range of the ...

  4. Foxhole radio - Wikipedia

    en.wikipedia.org/wiki/Foxhole_radio

    The foxhole radio, like a mineral crystal radio receiver, had no power source and ran off the power received from the radio station. They were named, likely by the press, for the foxhole, a defensive fighting position used during the war. There are also accounts of prisoners of war in World War II and in the Vietnam War having constructed ...

  5. SCR-54 - Wikipedia

    en.wikipedia.org/wiki/SCR-54

    A buzzer circuit, powered by a BA-4 battery, was mounted in the box cover and used to adjust the crystal. The set was compact and mounted in a wooden box, type BC-14. The lid of the box held the buzzer circuit, detectors, a screwdriver, two P-11 telephone headsets, spare parts, extra crystals, and an operating manual, “Radio Pamphlet No. 3 ...

  6. Greenleaf Whittier Pickard - Wikipedia

    en.wikipedia.org/wiki/Greenleaf_Whittier_Pickard

    Greenleaf Whittier Pickard (February 14, 1877 – January 8, 1956) was an American electrical engineer and inventor.. While not the earliest discoverer of the rectifying properties of contact between certain solid materials, he was largely responsible and most famous for the development of the crystal detector, the earliest type of diode detector. [1]

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  8. File:Crystal radio circuit with bias and buzzer.svg - Wikipedia

    en.wikipedia.org/wiki/File:Crystal_radio_circuit...

    These weren't very efficient rectifiers in crystal radios, because the low voltage signal from the antenna had to overcome the device's forward voltage drop, and so was insufficient to drive the device far into its conduction region, so it had a large AC resistance.

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