Modular Burglar Alarm


Posted on Jan 17, 2013

This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. It is connected permanently to the 12-volt supply and its operation is `enabled` by opening SW1. By using the expansion modules, you can add as many zones as you require; some or all of which may be the inertia (shock) sensor type. All the green LEDs should be lighting before you open SW1. You then have up to about a minute to leave the building. As you do so, the Buzzer will sound. It should stop sounding when you shut the door behind you.


Modular Burglar Alarm
Click here to download the full size of the above Circuit.

This indicates that the Exit/Entry loop has been successfully restored within the time allowed. When you re-enter the building you have up to about a minute to move SW1 to the off position. If SW1 is not switched off in time, the relay will energise and s




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Linear optocoupler for instrumentation
Data-based Load Pull Amplifier
room noise detector
uhf antenna amplifier booster
delay
NE555 Timer
Advanced Projects in Laser Communication
Dual-Slope Integrating ADC
Laptop Protector
ULTRASONIC RECEIVER
One light emitting diode display circuit



Top