Explaining circuit diagram

Discussion in 'Homework Help' started by TsAmE, May 8, 2010.

  1. TsAmE

    Thread Starter Member

    Apr 19, 2010
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    I dont know what to do with this problem. Could someone please draw the diagram (with paint etc) and upload it and explain what is happening to me?

    An intruder alarm in a home security system consists of a light beam and an alarm which is triggered if the light beam is broken, even if only briefly. Draw a combined circuit/logic diagram. The system uses an LDR (as in question 2 above) to detect the beam, with a sensitivity adjusting potentiometer and Darlington threshold detector. If the light beam is broken a resettable alarm is permanently triggered.
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. TsAmE

    Thread Starter Member

    Apr 19, 2010
    72
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    The thing is that I dont understand this problem i.e. I cant draw it :confused:
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    This might be useful as a starting point.

    http://www.electronickits.com/kit/complete/elec/ck1602.pdf

    The same idea in your question is implemented .... but .....
    You would have to simplify this circuit and also add a circuit function to latch the intruder detected condition and a reset function.
     
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