light activated switch

Discussion in 'General Electronics Chat' started by Dik, Aug 9, 2009.

  1. Dik

    Thread Starter New Member

    Aug 9, 2009
    1
    0
    I want to design a circuit wherein a permanent beam of light is present in an equipment. When the user uses the equipment the beam of light is cut momentarily and another device is switched on. How should I go about designing such a circuit?
    Thanks for your help
     
  2. AlainB

    Active Member

    Apr 12, 2009
    39
    0
    This schematic is a good start.

     
  3. AlainB

    Active Member

    Apr 12, 2009
    39
    0
    I just made that a few days ago and edit it today to include a counter.
     
    Last edited: Aug 11, 2009
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