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5 Zone Alarm System

Discussion in 'Electronic Projects' started by ElectroMaster, Jul 24, 2002.

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  1. ElectroMaster

    ElectroMaster Administrator

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    Each zone uses a normally closed contact. These can be micro switches or standard alarm contacts (usually reed switches). Zone 1 is a timed zone which must be used as the entry and exit point of the building. Zones 2 - 5 are immediate zones, which will trigger the alarm with no delay. Some RF immunity is provided for long wiring runs by the input capacitors, C1-C5. C7 and R14 also form a transient suppresser. The key switch acts as the Set/Unset and Reset switch. For good security this should be the metal type with a key. At switch on, C6 will charge via R11, this acts as the exit delay and is set to around 30 seconds. This can be altered by varying either C6 or R11. Once the timing period has elapsed, LED6 will light, meaning the system is armed. LED6 may be mounted externally (at the bell box for example) and provides visual indication that the system has set. Once set any contact that opens will trigger the alarm, including Zone 1. To prevent triggering the alarm on entry to the building, the concealed re-entry switch must be operated. This will discharge C6 and start the entry timer. The re-entry switch could be a concealed reed switch, located anywhere in a door frame, but invisible to the eye. The panic switch, when pressed, will trigger the alarm when set. Relay contacts RLA1 provide the latch, RLA2 operate the siren or buzzer.

    [​IMG]
     
  2. gbadex

    gbadex New Member

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    hi

    hello
    my name is toye and i'm a student at a uni in Nigeria, pls i'd like to know if you help me out on a simple project..SMOKE DETECTOR; kindly get accross to me if you possibly can.thank you
     
  3. Thunderchild

    Thunderchild New Member

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  4. dave

    Dave New Member

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  5. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    What makes you think they weren't copied from here?. The posting date here is 2002, how long have the files been on the other site? - the only indication on 'whois' is that it's a VERY recent domain!.
     
  6. Phasor

    Phasor Member

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    Yes, that domain was created on 20/6/2005. Roughly 3 weeks ago! Who's the REAL copycat???
     
  7. Thunderchild

    Thunderchild New Member

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    oops my appologies but what is going on then can u submit projects to the other site ?
     
  8. audioguru

    audioguru Well-Known Member Most Helpful Member

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    I found my projects copy-catted all over the web, usually at sites that I have never been to before. I don't care if they "steal" my designs because they keep my name on them. :lol:
     
  9. Zeshan

    Zeshan New Member

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    hi

    i have a question.. u know near by key switch u have a circle.. can u tell me plz what is that.. mean which electronics symbol is that... plz reply me as soon as possible.

    thz & regard

    Zeshan
     
  10. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    It's a siren or buzzer, it's mentioned in the text.
     
  11. Zeshan

    Zeshan New Member

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    hi

    thx 4 ur kind info... just 1 more thing.. u know near by transistor... is it relay again or what :?: .. plz let me know...

    thx & regard

    Zeshan
     
  12. Zeshan

    Zeshan New Member

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    hi

    here is the circuit diagram which i constructed.. circuit diagram enclosed as attachment.

    thx

    zeshan
     

    Attached Files:

  13. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Again, the text clearly calls it a relay.

    I notice in your diagram you show two relays, why is that?.
     
  14. Zeshan

    Zeshan New Member

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    hi

    can u have a look on the circuit diagram, i onstructed, to see if i constructed right.

    thx & regard
     
  15. Zeshan

    Zeshan New Member

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    hi

    hi

    i ve constructed another circuit plz have a look n tell me if it is correct..

    thx n regard

    zeshan
    uzeshan@hotmail.com
     

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  16. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Re: hi

    I'll ask again, why two relays?.

    And why not construct the project as presented?.
     
  17. bloody-orc

    bloody-orc New Member

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    he uses 2 relays cause he uses relays that have only one contact pair. in the schem that is given in the beginning there is a relay with 2 contactpairs and therefore only one is needed. he might noh have understood that.
     
  18. Zeshan

    Zeshan New Member

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    hi

    hi

    i m in college n studying electronics.. i just want to do some practice so it will help me in future... if this circuit works then i ll modify it... as i told u i constructed but its not working somehow. I tried to construct th ecircuit as presented. can i ask wot type os relay is that.

    thx

    zeshan
     
  19. Zeshan

    Zeshan New Member

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    hi

    hi

    i constructed this circuit on electronic workbench but its not working.. any idea why.. pls tell me any possible reasons..

    thx

    zeshan
     
  20. Mike - K8LH

    Mike - K8LH Well-Known Member

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    Very interesting... Do you have an example I can look at, I'm very curious?

    Regards, Mike
     
  21. haka

    haka New Member

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    normally this is use for wat? can show me some title ? hehe.. cos i would to do it.. as my project.. hehe.. can i do da?
     
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