Anti bag snatching alarm

To prevent snatching here is a very easy and also very useful project to be used in a bag or suitcase, anti-bag snatch alarm. The sound produced by anti bag snatching alarm is like a police horn, when someone tries to snatch your bag or suitcase

Circuit anti-bag snatch description alarm

This whole circuit anti bag snatch is the alarm operating amplifier IC CA 3140 (IC1), which is configured as a comparator. Two inputs (irreversible and non-invoking) respectively, the numbers 3 and 2 of the operating amplifier are pinned and output from pin number 6 is obtained. Here IC 2 (Timer IC NE555) is used as uncomfortable multivibrator. The timing component of anti bag snatching alarm is R5, VR1 and capacitor C2, with the given value in this circuit diagram, the timer time is approximately 1 minute.

For audio segment, IC3 is used as an alarm tone generator with an inbuilt oscillator. Ultimately, to achieve the desired level of production, and ultimately the output is supplied for the loudspeaker so that IC 3 can be increased by transistor T1 from pin number 3.