proximity switch

Discussion in 'General Electronics Chat' started by sify87, Jul 3, 2010.

  1. sify87

    Thread Starter New Member

    Jun 23, 2010
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    0
    Can u plz help how a NPN or PNP transistors is used in proximity switches?
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Are you wanting to implement a proximity switch or are you looking to implement a touch switch?

    A touch switch can be built with a single MOSFET. A proximity switch is bit more involved.

    hgmjr
     
  3. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Are you thinking of HALL effect sensors? They often look like NPN and/or PNP transistors and can be used for proximity sensors/switches

    [​IMG]

    And some even more so.
     
    Last edited: Jul 3, 2010
  4. Jaguarjoe

    Active Member

    Apr 7, 2010
    770
    90
    Industrial prox switches are referred to as NPN or PNP depending on how the output is configured. An NPN prox is a low side switch, a PNP is a high side switch.
     
    sify87 likes this.
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