5 Zone Alarm System - Electronic Circuits Projects Diagrams Free

**ElectroMaster** · 25th July 2002, 01:08 AM

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.

gbadex · 5th January 2005, 03:21 AM

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

Thunderchild · 8th July 2005, 08:53 PM

u damn copycat this is located at http://www.free-electronic-circuits....one-alarm.html and so r lts of other diagrams in this section and they r linked to by the forum anyhow !

**Nigel Goodwin** · 8th July 2005, 09:08 PM

Quote:

Originally Posted by Thunderchild

u damn copycat this is located at http://www.free-electronic-circuits....one-alarm.html and so r lts of other diagrams in this section and they r linked to by the forum anyhow !

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!.

Phasor · 9th July 2005, 12:36 AM

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

Thunderchild · 9th July 2005, 05:28 AM

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

audioguru · 9th July 2005, 10:14 AM

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:

Zeshan · 28th September 2005, 03:28 PM

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

**Nigel Goodwin** · 28th September 2005, 04:01 PM

Quote:

Originally Posted by Zeshan

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.

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

Zeshan · 28th September 2005, 08:44 PM

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

Zeshan · 28th September 2005, 10:53 PM

hi

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

thx

zeshan

**Nigel Goodwin** · 29th September 2005, 08:09 AM

Quote:

Originally Posted by Zeshan

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...

Again, the text clearly calls it a relay.

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

Zeshan · 29th September 2005, 09:21 AM

hi

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

thx & regard

Zeshan · 29th September 2005, 11:25 PM

hi

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

thx n regard

zeshan
uzeshan@hotmail.com

**Nigel Goodwin** · 30th September 2005, 08:04 AM

Quote:

Originally Posted by Zeshan

hi

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

thx n regard

zeshan
uzeshan@hotmail.com

I'll ask again, why two relays?.

And why not construct the project as presented?.

25th July 2002, 01:08 AM	(permalink)
ElectroMaster Administrator	5 Zone Alarm System 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. __________________ ▌ Electro Tech Online Owner ▌ Need to contact me? Send me a Private Message. ▌ Verification Email didn't arrive? See this thread.

5th January 2005, 03:21 AM	(permalink)
gbadex New Member	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

8th July 2005, 08:53 PM	(permalink)
Thunderchild Experienced Member	u damn copycat this is located at http://www.free-electronic-circuits....one-alarm.html and so r lts of other diagrams in this section and they r linked to by the forum anyhow ! __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography

9th July 2005, 05:28 AM	(permalink)
Thunderchild Experienced Member	oops my appologies but what is going on then can u submit projects to the other site ? __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography

9th July 2005, 10:14 AM	(permalink)
audioguru Experienced Member	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: __________________ Uncle $crooge

9th July 2005, 12:36 AM	(permalink)
Phasor Experienced Member	Yes, that domain was created on 20/6/2005. Roughly 3 weeks ago! Who's the REAL copycat???

28th September 2005, 03:28 PM	(permalink)
Zeshan New Member	5 zone alarm system 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

28th September 2005, 08:44 PM	(permalink)
Zeshan New Member	5 zone alarm system 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

29th September 2005, 09:21 AM	(permalink)
Zeshan New Member	5 zone alarm system hi can u have a look on the circuit diagram, i onstructed, to see if i constructed right. thx & regard

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