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Electronic amplifier — A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In… … Wikipedia
Coherer — Metal filings coherer The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the twentieth century. Invented around 1890 by French scientist Édouard… … Wikipedia
Guglielmo Marconi — Born 25 April 1874(1874 04 25) Palazzo Marescalchi, Bologna … Wikipedia
Pibroch — Pibroch, Piobaireachd or Ceòl Mór is an art music genre associated primarily with the Scottish Highlands that is characterised by extended compositions with a melodic theme and elaborate formal variations. It is currently performed principally on … Wikipedia

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