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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.
A very successful August 1925 Philco consumer product, called the "Socket Power Battery Eliminator", was a rectifier unit which enabled users to operate radios from standard light sockets. By 1927 over a million of these units had been sold, but from that year the industry began manufacturing batteryless radios using RCA 's AC tube .
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 ...
The RCA model R7 Superette superheterodyne table radio. This is a list of notable radios, which encompasses specific models and brands of radio transmitters, receivers and transceivers, both actively manufactured and defunct, including receivers, two-way radios, citizens band radios, shortwave radios, ham radios, scanners, weather radios and airband and marine VHF radios.
Wireless microphone receiver racks backstage at a large televised music awards event Wireless microphone and radio receiver. There are many types of receiver. True Diversity receivers have two radio modules and two antennas. Diversity receivers have one radio module and two antennas, although some times the second antenna may not be obviously ...
The Toot-a-Loop Radio or Panasonic R-72 was a novelty radio made by Panasonic Japan in the early 1970s. This radio was designed to be wrapped around the wrist. It also came with stickers for customizing the unit. Reception was the AM broadcast band only - no FM (the FM version of this radio is called RF-72).
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