Electronics Forum

Electronics Circuits & Projects discussion forum. Get help with electronics.


Need one modification to a burglar alarm system

Discuss about electronic circuits here. Request help for circuits that you couldn't find anywhere else, how a circuit works etc. Discuss anything related to electronic circuits.

Moderator: pebe

Need one modification to a burglar alarm system

Postby larrybum@yahoo.com » Sat Jan 24, 2015 3:17 pm

I used to do custom circuits back in the 70s but have got out of the habit until just now. I bought a kit from Cheney Electronics to build a professional burglar alarm. I have it working. It will give a 30 second delay to allow you to leave a protected area, it will give you a 30 second delay to turn it off when you come back into a protected area, and it will sound an alarm for one minute then turn off.

The problem is if the open circuit (which triggers the alarm) is not closed after the alarm sounds, it will not reset and will sound again for a minute.

I don't want this. I want the alarm to sound only one time for a minute or so and then turn off. It would no sound again until he alarm had been turned off and would then be enabled for the next event.

So, I think what I want is for a device to do the following:

1. be powered on
2. accept only one 9 volt signal to an input
3 Trigger a relay that will stay active for a set variable time (1-5 minutes)
4. Ignore any further transitions of the 9 volt input.

I'm betting there is such a device out there, but I can't find it clearly explained as to how it works.

It also need to be low power as it waits for the 9 volt input and it's power supply should also be 9 volts.

Any ideas??
larrybum@yahoo.com
 
Posts: 1
Joined: Sat Jan 24, 2015 3:00 pm

Re: Need one modification to a burglar alarm system

Postby KMoffett » Sat Jan 24, 2015 4:00 pm

Assuming this is what you are using http://www.electronickitsbychaneyelectronics.com/prodinfo.asp?number=C6785, do you have a schematic?

Ken
KMoffett
 
Posts: 186
Joined: Sun Apr 13, 2014 3:41 pm
Location: Minnesota USA


Return to Electronic Circuits Help



Who is online

Users browsing this forum: No registered users and 5 guests

LCD Transistor Tester Diode Thyristor resistors Capacitance ESR LCR Meter
$12.13
LCD Transistor Tester Diode Thyristor resistors Capacitance ESR LCR Meter pictureAEG Thyristor Switch Thyro-A: 1A 230-30 H RL1 ... BRAND NEW
$200.0
AEG Thyristor Switch Thyro-A: 1A 230-30 H RL1 ... BRAND NEW picture1 PC Genuine Sony CRT TV Thyristor SG264A SG-264A, 8-726-420-00 NEW Sealed
$23.99
1 PC Genuine Sony CRT TV Thyristor SG264A SG-264A, 8-726-420-00 NEW Sealed picture1x KT505 Thyristor - 400V 1A Igt=10mA TO-39
$2.32
1x KT505 Thyristor - 400V  1A Igt=10mA TO-39 picture


cron