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

Photoelectric switch
Solar Power walkway marker Led display
DIY Arduino Nebulophone Synth
lm317 adjustable power supply electronic project
Long Range FM Transmitter
3 band equalizer circuit
af filter
Speed Control of DC Motor using Microcontroller by using PWM ECE Project
Several gates as a crystal oscillator circuit