Laser Alarm System Question

Discussion in 'The Projects Forum' started by That One Kid, Nov 1, 2009.

  1. That One Kid

    Thread Starter New Member

    Nov 1, 2009
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    I've found an laser alarms system diagram on the internet but I am not sure how to test or use it on a breadboard. I need some help converting the diagram to something physical on the breadboard.
    Heres the link to the diagram:

    http://www.instructables.com/file/FHEWL9TFD80BUXE/

    [​IMG][​IMG]
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. beenthere

    Retired Moderator

    Apr 20, 2004
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    The circuit you have linked to can't possibly work. The transistor will burn up with uncontrolled current flowing in the base.

    The "Laser Perimeter Alarm" project might work okay, though. The circuit is arranged to drive the transistor properly, and you get the step-by-step directions - http://www.instructables.com/id/S0KR1YKFOHU38MF/
     
  4. That One Kid

    Thread Starter New Member

    Nov 1, 2009
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    The thing is I want to test it and where it shows the breadboard tutorial there is suppose to be a video. That video is not there even though I have the latest flash player. It also provides no written instructions on the breadboard tutorial.

    So back to my original question, how do I get this diagram to a breadboard?
     
  5. bertus

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  6. hgmjr

    Moderator

    Jan 28, 2005
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    It is worth mentioning that there is some risk of damage to the transistor associated with the circuit that is shown in the Instructables. The 5K potentiometer is wired in a manner that if adjusted to the extreme end of its range, the base would be connected to +9V. This can be avoided by placing a 1K resistor in series with the potentiometer.

    hgmjr
     
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