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I Need Your Help In These light alarm

Discussion in 'LEDs and Optoelectronics' started by Belal, Sep 17, 2010.

  1. Belal

    Belal

    2
    0
    Sep 17, 2010
    Hi
    In the Attachments There is a light alarm circuit but there is a problem in these circuit:
    When a person cut the light (pass through the laser beam) the alarm will work only if there is no light, in my case these will take less than a second thus I will not hear the alarm, so how can I let it work until I disconnect it in myself.
    Thanks...
     
  2. LTX71CM

    LTX71CM

    182
    0
    May 23, 2010
    An SCR or one-shot timer.
     
  3. Belal

    Belal

    2
    0
    Sep 17, 2010
    Excuse me, I'm Just an Amateur, So Can You Tell Me How To Do That Please?
     
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