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Crystal radios are the simplest type of radio receiver [2] and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of wire, a capacitor, a crystal detector, and earphones (because a crystal set has insufficient power for a loudspeaker). [3]
World War 2 created widespread urgent need for radio communication, and foxhole sets were built by people without access to traditional radio parts. A foxhole radio is a simple crystal sets radio receiver cobbled together from whatever parts one could make (which were very few indeed) or scrounged from junked equipment. Such a set typically ...
The crystal radio was the first type of radio receiver that was used by the general public, [14] and became the most widely used type of radio until the 1920s. [17] It became obsolete with the development of vacuum tube receivers around 1920, [ 1 ] [ 14 ] but continued to be used until World War II and remains a common educational project today ...
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 ...
A crystal radio uses no active parts: it is powered only by the radio signal itself, whose detected power feeds headphones in order to be audible at all. In order to achieve even a minimal sensitivity, a crystal radio is limited to low frequencies using a large antenna (usually a long wire).
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 ...
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Sharp Electronics' first electrical product was a batteryless crystal radio introduced in 1925. It was Japan's first—and sold extremely well. Thermoelectricity was widely used in the remote parts of the Soviet Union from the 1920s to power radios.
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