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The ZN414 is a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti , but was second sourced from GEC-Plessey . The ZN414 was popular amongst hobbyists, as a fully working AM radio could be made with just a few external components, a crystal earpiece and a 1.5 V cel l.
The term radio receiver is understood in this article to mean any device which is intended to receive a radio signal in order to generate useful information from the signal, most notably a recreation of the so-called baseband signal (such as audio) which modulated the radio signal at the time of transmission in a communications or broadcast system.
Block diagram of a crystal radio receiver Circuit diagram of a simple crystal radio. A crystal radio can be thought of as a radio receiver reduced to its essentials. [3] [39] It consists of at least these components: [22] [40] [41] An antenna in which electric currents are induced by electromagnetic radiation.
Radio receivers are essential components of all systems that use radio. The information produced by the receiver may be in the form of sound, video , or digital data. [1] A radio receiver may be a separate piece of electronic equipment, or an electronic circuit within another device.
A radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna. Radio waves are electromagnetic waves with frequencies between about 30 Hz and 300 GHz. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the ...
The MK484 AM radio IC is a fully functional AM radio detector on a chip. It is constructed in a TO-92 case, resembling a small transistor. It replaces the similar ZN414 AM radio IC from the 1970s. The MK484 is favored by many hobbyists. It is advantageous in that it performs well with minimal discrete components, and can run from a single 1.5 ...
The first U.S. patent application for SSB modulation was filed on December 1, 1915, by John Renshaw Carson. [3] The U.S. Navy experimented with SSB over its radio circuits before World War I. [4] [5] SSB first entered commercial service on January 7, 1927, on the longwave transatlantic public radiotelephone circuit between New York and London.
The last book Sinclair wrote as an employee of Bernard's was Modern Transistor Circuits for Beginners, published in May 1962. [13] At Bernard Babani, he wrote 13 constructor books. [14] In 1961, Sinclair registered Sinclair Radionics Ltd. His original choice, Sinclair Electronics, had been taken; Sinclair Radio was