Loop through

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Looping describes a type of wiring in electrical engineering practice.

Electrical engineering

The individual wires of an electrical line ( phase , neutral conductor and protective conductor ) are made available through a parallel connection in another socket . This means that the electrical voltage and the frequency (e.g. 230  V / 50  Hz ) are looped through.

Applications are e.g. B.

Audio and video signals

In addition to its use with mains voltages, the term looping through is also known for audio and video signals.

  • Certain filter and processing stages are often used optionally, whereby the unadulterated input signal can optionally be looped through directly to the output without any processing. An example of this is the EQ switch on a mixer channel. Here the switch bypasses the channel's EQ stage; the signal is looped through to the following section of the channel (usually the AUX or the fader section).
  • Or the input signal is looped through to a distribution point to which other processing stages can optionally be connected. An example of this is the insert socket of a mixing console, where the audio signal is looped through as long as no insert plug interrupts the signal path.
  • The loudspeaker output terminals on many amplifiers, where you can connect several pairs of speakers to the power amplifier .
  • Many PA boxes (= "festival boxes") offer not only the input but also an output so that PA speaker towers can be operated by looping through with just one line to the power amplifier.
  • The additional cinch sockets on the back of a television that pick up the signal from the Scart socket.

Further examples

  • The Molex connector in the PC power supply unit if a line contains more than one Molex connector.
  • PC networks with BNC connectors .

literature

  • R. Beckmann: Manual of PA technology, basic component practice. 2nd edition, Elektor-Verlag, Aachen, 1990, ISBN 3-921608-66-X
  • Wilhelm Gerster: Modern lighting systems for indoors and outdoors. 1st edition, Compact Verlag, Munich, 1997, ISBN 3-8174-2395-0
  • Martin Klein: Klein introduction to the DIN standards. 13th edition, BG Teubner Verlag, Stuttgart 2001, ISBN 978-3-322-92720-0 .
  • Michael Dickreiter, Volker Dittel, Wolfgang Hoeg, Martin Wöhr (eds.): Manual of the recording studio technology . 8th, revised and expanded edition, 2 volumes. Walter de Gruyter, Berlin / Boston 2014, ISBN 978-3-11-028978-7 .

See also