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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.
Also in the book are the advertisement rates for Radio Constructor at the time (9d (3¾p)/word, minimum 6/- (30p)) and Practical Wireless (5/6 (27½p) per line or part line). Sinclair estimated producing 1,000 a month, placing orders with suppliers for 10,000 of each component to be delivered.
The first step on the road to radio control. James A. Gupton, Jr. 52/3: March 1981 Computer-Selectric interface: An easy way to use an IBM Selectric terminal/printer for output from your computer. E. G. Brooner: 52/4: April 1981 Unicorn-1 robot: Finishing up the conversion to radio control. James A. Gupton, Jr. 52/4: April 1981 Audio-signal ...
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.
principles, math, or theories used to engineer receiver- and transmitter-related devices and circuits. For articles related to systems or entire pieces of equipment used in broadcasting, consider Category:Radio. For example, articles about master control, translators, Optimod compressors, or studio-transmitter links belong in the Radio category.
For example, a 1933 Murphy radio with essentially the same circuit had different models for AC supply, DC supply, and battery operation. [1] The introduction of AC/DC circuitry allowed a single model to be used on either AC or DC mains as a selling point, [ 2 ] and some such models added "Universal" to their name [ 3 ] (such sets usually had ...
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 ...
In radio equipment, Automatic Frequency Control (AFC), also called Automatic Fine Tuning (AFT), is a method or circuit to automatically keep a resonant circuit tuned to the frequency of an incoming radio signal. It is primarily used in radio receivers to keep the receiver tuned to the frequency of the desired station.