Wanted Simple sound annunciation circuit

Discussion in 'General Electronics Chat' started by a_chahande, Dec 30, 2008.

  1. a_chahande

    Thread Starter New Member

    Dec 30, 2008
    2
    0
    I want to build simple ckt.
    It has 1 contact which closes when any fault occurs to the system.
    Then the bell is sounded.
    The operator pushes accept button to silence the bell.
    Then the contact can be reset afterwards
    please reply to my mail
    a_chahande@yahoo.com
     
  2. Alberto

    Active Member

    Nov 7, 2008
    169
    36
    The attached diagram should solve your problem.

    Alberto
     
  3. a_chahande

    Thread Starter New Member

    Dec 30, 2008
    2
    0
    Thank u! Alberto
    I want some more help. If the 'start contact' is not 'self reset' type and If there is 2 to 4 'start alarm' contacts.
    Thanks!
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    a_chahande,

    Is the fault(s) contact closure momentary, or does it remain closed as long as the fault exists? If it's momentary, Alberto's circuit will work. If its continuous, it will not work. The buzzer will be silenced only as long as the reset switch is held open. The buzzer relay will reactivate as soon as the reset switch is released. The attached circuit should work for silencing the alarm of one or more paralleled, continuous, fault-contact closures.

    Ken
     
  5. Alberto

    Active Member

    Nov 7, 2008
    169
    36
    The circuit will work for simple application, as I understood from post #1, for more complex situation we need to use some electronics, and in this case request must be more specific with details on type sensors their number and sequence.

    Alberto
     
    Last edited: Jan 5, 2009
  6. italo

    New Member

    Nov 20, 2005
    205
    1
    system faults how ? detect what? Military provide a working order of what it must do when,how, where. You give us nothing except a system fault. whatever that means to you I am sure it means something else to others.
     
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