Magnetic proximity switch.

admin May 3, 2008 7 Comments

Description.

Here is the circuit diagram of a magnetic proximity switch that finds a lot of applications in many fields.The circuit is based on a magnetic reed switch(S1) as the proximity sensor. A monostable multivibrator based on NE555 (IC1) and a toggle flip flop based on CD4013 (IC2) does the rest of the circuit.

When a magnet is reached in proximity of S1 it closes to give a negative trigger at pin 2 of IC1.The output of IC1 goes high for a time determines by R2 and C2.This clocks the IC2 wired as a toggle flip flop.The output (pin 1 ) of IC2 goes high and the transistor Q1 is biased to ON.The relay is activated and so do the equipment connected to the relay.The LED D1 glows when IC1 is triggered.

Circuit diagram with Parts list.

magnetic-proximity-switch.JPG
Notes.

  • Switch S1 can be a general purpose magnetic reed switch.
  • The equipment to control can be connected using NC,NO and C points of the relay according to the application.
  • Use a 12 regulated power supply for powering the circuit.
Comments
  • August 23, 2015

    looking for circuit diagram for photoelectric proximity sensors please tell us if you can supply

  • August 6, 2015

    we are in the line of masking sensors we want diffrent type of circuits with your back upo support pl advice us how we can go ahead with the same
    sachdeva
    sensordealers@gmail.com
    008976076949
    \india

  • felix
    March 29, 2015

    in IC2 pin 16 does what and is it pin 16 or pin?

  • venky
    August 4, 2013

    could this use for transmission lines

  • german hernandez
    August 8, 2011

    muchas gracias por haberme permitido pertenecer a esta pagina prestigiosa

  • yEshA
    May 10, 2011

    could i get a simple diagram of the reed switch??

  • kinq
    April 25, 2011

    am making a magnet activated lock using this circuit so i will like to know more about its sensitivity.

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