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A 22.5 volt battery provides power, since the only way to get adequate radio frequency performance out of early transistors was to run them close to their collector-to-emitter breakdown voltage. The current drain from this battery is only 4 mA, [ 7 ] allowing 20 to 30 hours of operation, in comparison to only several hours for the portable ...
Portable radios may have an arrangement for powering from an outlet, conserving the batteries when an outlet is available. Portable "emergency" radios may be solar and/or hand crank powered. [7] Boom box - a portable battery-powered high fidelity stereo sound system in the form of a box with a handle, which became popular during the mid-1970s.
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A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.
It was designed by G.D. Reynolds of Murphy Radio. Both AC and battery-operated versions were made. [7] [8] [9] Walkman – The original Walkman, released in 1979, was a portable cassette player. The Walkman brand was later extended to serve most of Sony's portable audio devices as well as related media devices, including radio receivers.
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In 1953, Emerson Radio and Phonograph purchased Quiet Heet Corp., which entered the company into air conditioning. Although radio represented only 15 percent of Emerson's revenue by 1954, the company credited itself as creating the first clock radio, self-powered radio, and transistorized pocket radio. Production of tape recorders began in 1955.
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