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Need Help ... Final Project....

Discussion in 'General Electronics Discussion' started by Non89, Nov 2, 2010.

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  1. Non89

    Non89

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    Nov 2, 2010
    i want to make a doorbell , after pressing 3 time or 5sec after without responce, another recorder circuit will work for record the visitor voice.... so how can i mix up the circuit, is the sensor needed???
     
  2. cute109

    cute109

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    Oct 8, 2010
    how about using a timer circuit to start the recorder circuit and a relay for the switching between doorbell and a recorder.
     
  3. Non89

    Non89

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    Nov 2, 2010
    the circuit can work like this??
     
  4. eptheta

    eptheta

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    Dec 20, 2009
    Like what ?

    If you want, use a micro controller, that would make everything simple. Just program your chip appropriately. But i guess you want to do it without one...

    You could get a binary counter chip like the 4017 and take the appropriate outputs for binary 3 (11) and AND it with a 4081.

    Then get a timer circuit (easiest to use is a 555) which has a 5 sec delay attached to a latch or relay. (that is for an adjustable delay, but if you want a such a small delay, you might as well have a large capacitor charging up in series to a PNPs base.)

    You need a reset mechanism too, but you can worry about that later..

    You should probably wait for someone else to approve this or suggest something way easier...
     
  5. Non89

    Non89

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    Nov 2, 2010
    my country hard to find the ISD 1016A Ic ..... got any recorder circuit that having play-back system bt using more population IC??
     
  6. Non89

    Non89

    7
    0
    Nov 2, 2010
    ISD 1110 can repeated record??
     
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