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A batteryless radio is a type of radio receiver that does not require the use of a battery to provide it with electrical power. Originally this referred to units which could be used directly by AC mains supply (mains radio); it can also refer to units which do not require a power source at all, except for the power that they receive from an ...
The new company controlled Rogers Radio Tube Company and Rogers Batteryless Radio Company. Joseph Elsworth Rogers (1898–1960), brother of Edward Rogers, was an important member of the company and served as vice-president until 1939, and then as head from 1939 to 1960.
The first boombox was developed by the inventor of the audio compact cassette, Philips of the Netherlands.Their first 'Radiorecorder' was released in 1966. The Philips innovation was the first time that radio broadcasts could be recorded onto cassette tapes without the cables or microphones that previous stand-alone cassette tape recorders required.
Philips radio receiver, Model 930A (1931) While Philips' first product was manufactured in 1891, the first product that would fit in the Consumer Electronics division was a television, experimentally manufactured in 1925. In 1927, Philips began producing radios. Only five years later, Philips had sold one million of them.
Philco also made battery-powered radios which were by then called "farm radios", most of which had cabinets identical to their AC powered versions. The Philco "Baby Grand" (today called "cathedral" radios by collectors) was a shape that featured an arched top that wrapped from the sides over the top.
The radio receiver's memory is programmed by any number of means to respond to certain selected "switches" or (more correctly) remote control transmitters. Using the existing power lines (such as INSTEON or X10 ): A receiver is plugged into an outlet and a device is then plugged into the receiver.
Bluetooth 1.2 allowed for faster speed up to ≈700 kbit/s. Bluetooth 2.0 improved on this for speeds up to 3 Mbit/s. Bluetooth 2.1 improved device pairing speed and security. Bluetooth 3.0 again improved transfer speed up to 24 Mbit/s. In 2010 Bluetooth 4.0 (Low Energy) was released with its main focus being reduced power consumption.
The rocket radio was also used as an emergency radio, because it did not require batteries or an AC outlet. The rocket radio was available in several rocket styles, as well as other styles that featured the same basic circuit. [38] Transistor radios had become available at the time, but were expensive. Once those radios dropped in price, the ...