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  2. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    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 radio waves.

  3. File:Simplest crystal radio circuit.svg - Wikipedia

    en.wikipedia.org/wiki/File:Simplest_crystal...

    English: Circuit of the simplest possible crystal radio receiver. Circuits of this type were used in the first experimental crystal radio receivers in the pioneering days of radio, just after 1900. It consists of a crystal detector (semiconductor diode) DI connected between a long wire antenna and ground, with a sensitive earphone E1 attached ...

  4. Radio receiver design - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver_design

    A schematic of a superhet AM receiver. Note that the radio includes an AGC loop in order to maintain the RF and IF stages in their linear region, and to produce an audio output not dependent on the signal power received. Here we show block diagrams for typical superheterodyne receivers for AM and FM broadcast respectively.

  5. File:Circuit diagram of a crystal radio receiver.svg - Wikipedia

    en.wikipedia.org/wiki/File:Circuit_diagram_of_a...

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  6. File:Preselector, Wiring diagram of a simple radio circuit ...

    en.wikipedia.org/wiki/File:Preselector,_Wiring...

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  7. Detector (radio) - Wikipedia

    en.wikipedia.org/wiki/Detector_(radio)

    A simple crystal radio with no tuned circuit can be used to listen to strong AM broadcast signals. An early form of envelope detector was the crystal detector, which was used in the crystal set radio receiver. A later version using a crystal diode is still used in crystal radio sets today.

  8. ZN414 - Wikipedia

    en.wikipedia.org/wiki/ZN414

    The radio circuit inside the ZN414 is based on a design known as Tuned Radio Frequency (TRF). The TRF design is much simpler than the popular, but more complex, superheterodyne radio circuit often used in modern AM receivers. It is principally the use of the TRF circuit that allows almost a whole radio to be fitted into one small, three pin ...

  9. Radio transmitter design - Wikipedia

    en.wikipedia.org/wiki/Radio_transmitter_design

    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 ...