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  2. Transistor radio - Wikipedia

    en.wikipedia.org/wiki/Transistor_radio

    An early 2000s transistor radio (Sony Walkman SRF-S84 transistor radio, released 2001, shown without earphones) Rock 'n roll music became popular at the same time as transistor radios. Parents found that purchasing a small transistor radio was a way for children to listen to their music without using the family tube radio.

  3. Radio receiver design - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver_design

    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.

  4. Electronic symbol - Wikipedia

    en.wikipedia.org/wiki/Electronic_symbol

    Common circuit diagram symbols (US ANSI symbols) An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may ...

  5. Radio transmitter design - Wikipedia

    en.wikipedia.org/wiki/Radio_transmitter_design

    In some indirect FM solid state circuits, an RF drive is applied to the base of a transistor. The tank circuit (LC), connected to the collector via a capacitor, contains a pair of varicap diodes. As the voltage applied to the varicaps is changed, the phase shift of the output will change.

  6. Transistor - Wikipedia

    en.wikipedia.org/wiki/Transistor

    The first prototype pocket transistor radio was shown by INTERMETALL, a company founded by Herbert Mataré in 1952, at the Internationale Funkausstellung Düsseldorf from August 29 to September 6, 1953. [38] [39] The first production-model pocket transistor radio was the Regency TR-1, released in October 1954. [26]

  7. Superheterodyne receiver - Wikipedia

    en.wikipedia.org/wiki/Superheterodyne_receiver

    A 5-tube superheterodyne receiver manufactured by Toshiba circa 1955 Superheterodyne transistor radio circuit circa 1975. A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.

  8. RF CMOS - Wikipedia

    en.wikipedia.org/wiki/RF_CMOS

    RF CMOS is a metal–oxide–semiconductor (MOS) integrated circuit (IC) technology that integrates radio-frequency (RF), analog and digital electronics on a mixed-signal CMOS (complementary MOS) RF circuit chip. [7] [8] It is widely used in modern wireless telecommunications, such as cellular networks, Bluetooth, Wi-Fi, GPS receivers ...

  9. Armstrong oscillator - Wikipedia

    en.wikipedia.org/wiki/Armstrong_oscillator

    The non-linear characteristic of the transistor or tube also demodulated the RF signal to produce the audio signal. The circuit diagram shown is a modern implementation, using a field-effect transistor as the amplifying element. Armstrong's original design used a triode vacuum tube. Meissner oscillator schematic, original 1913 vacuum tube version