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  2. Buzzer - Wikipedia

    en.wikipedia.org/wiki/Buzzer

    A buzzer or beeper is an audio signaling device, [1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices , timers , train and confirmation of user input such as a mouse click or keystroke.

  3. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    The earliest practical use of crystal radio was to receive Morse code radio signals transmitted from spark-gap transmitters by early amateur radio experimenters. As electronics evolved, the ability to send voice signals by radio caused a technological explosion around 1920 that evolved into today's radio broadcasting industry.

  4. UVB-76 - Wikipedia

    en.wikipedia.org/wiki/UVB-76

    UVB-76 - "The Buzzer", recorded on 10 August 2022. The station is commonly known as "The Buzzer" [7] in both English and Russian (Russian: Жужжалка). From its first voice transmission in 1997 to 2010, the station identified itself as UZB-76 [8] [9] (Russian: УЗБ-76).

  5. Piezoelectric speaker - Wikipedia

    en.wikipedia.org/wiki/Piezoelectric_speaker

    A piezoelectric speaker (also known as a piezo bender due to its mode of operation, and sometimes colloquially called a "piezo", buzzer, crystal loudspeaker or beep speaker) is a loudspeaker that uses the piezoelectric effect for generating sound. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and ...

  6. Spark-gap transmitter - Wikipedia

    en.wikipedia.org/wiki/Spark-gap_transmitter

    [1] [2] Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. [3] [4] German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the ...

  7. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...

  8. Buzzer (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Buzzer_(disambiguation)

    A buzzer is a signalling device. Buzzer or The Buzzer may also refer to: Buzzer (whirligig), an ancient mechanical device used for ceremonial purposes and as a toy; Buzzer (internet), an Indonesian term to refer to influence operators; Buzzer (G.I. Joe), a fictional character in the G.I. Joe universe; The Buzzer, nickname for radio station UVB-76

  9. Timeline of electrical and electronic engineering - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_electrical_and...

    The Danish physicist Valdemar Poulsen creates the world's first magnetic recording and reproduction, using a 1 mm thick steel wire as a magnetizable carrier. Nikola Tesla publicly demonstrated the first wireless remote control of a model ship. 1899: The dog "Nipper" is used in "His Master's Voice", the trademark for gramophones and records.