5 Zone Alarm System - Page 2 - Electronic Circuits Projects Diagrams Free

bloody-orc · 30th September 2005, 08:54 AM

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.

Zeshan · 30th September 2005, 10:49 AM

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

Zeshan · 16th October 2005, 09:16 PM

hi

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

thx

zeshan

Mike, K8LH · 12th March 2006, 01:47 PM

Quote:

Originally Posted by audioguru

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:

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

Regards, Mike

haka · 26th April 2006, 01:46 PM

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?

oldtimer · 3rd July 2006, 09:05 PM

have you tried holding a magnet near a reed switch to keep it closed while you open the door or window? I haven't but it would be interesting to find out.

**Nigel Goodwin** · 3rd July 2006, 09:08 PM

Quote:

Originally Posted by oldtimer

have you tried holding a magnet near a reed switch to keep it closed while you open the door or window? I haven't but it would be interesting to find out.

You need to know exactly where the reed is hidden, and also which way round the existing magnet is - or you've got a 50% change of setting the alarm off when you apply your magnet!.

oldtimer · 4th July 2006, 02:06 AM

Yes I know that Nigel but it is fairly easy to find the switch since it has its own magnet and the polarity can be found without operating the reed, I prefer to use plate to plate contacts not because of reed problem,I just thought of that, but because they're cheap and reliable. I was born in Sheffield and hiked around Derbyshire in my youth,durint war tha nose.

usmankhan · 11th July 2006, 09:58 AM

hello,
Its very nice

densimitre · 12th July 2006, 03:17 AM

Hi
I need detect a bell fault in a PIC alarm based project....

the circuit is a common npn transistor with collector pull to 12 volts and a diode to protect tehm from inverse emf coming from relay or bell....

thank you

neilz90 · 6th February 2007, 02:41 AM

could anyone tell me how to compensate for only 3 zones. I've got it drawn but I haven't filed in any of the values.

30th September 2005, 08:54 AM	(permalink)
bloody-orc Experienced Member	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. __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

30th September 2005, 10:49 AM	(permalink)
Zeshan New Member	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

16th October 2005, 09:16 PM	(permalink)
Zeshan New Member	hi hi i constructed this circuit on electronic workbench but its not working.. any idea why.. pls tell me any possible reasons.. thx zeshan

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26th April 2006, 01:46 PM	(permalink)
haka New Member	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?

3rd July 2006, 09:05 PM	(permalink)
oldtimer Experienced Member	have you tried holding a magnet near a reed switch to keep it closed while you open the door or window? I haven't but it would be interesting to find out.

4th July 2006, 02:06 AM	(permalink)
oldtimer Experienced Member	Yes I know that Nigel but it is fairly easy to find the switch since it has its own magnet and the polarity can be found without operating the reed, I prefer to use plate to plate contacts not because of reed problem,I just thought of that, but because they're cheap and reliable. I was born in Sheffield and hiked around Derbyshire in my youth,durint war tha nose.

11th July 2006, 09:58 AM	(permalink)
usmankhan New Member	hello, Its very nice

12th July 2006, 03:17 AM	(permalink)
densimitre New Member	Hi I need detect a bell fault in a PIC alarm based project.... the circuit is a common npn transistor with collector pull to 12 volts and a diode to protect tehm from inverse emf coming from relay or bell.... thank you

6th February 2007, 02:41 AM	(permalink)
neilz90 New Member	could anyone tell me how to compensate for only 3 zones. I've got it drawn but I haven't filed in any of the values.