Simple Anti Bag Snatching Alarm Circuit Diagram . The heart of this entire circuit anti bag snatching alarm is operational amplifier IC CA3140 (IC 1 ), configured as a comparator. The two inputs (inverting and non – inverting) is given to pin no 3 and 2 of operational amplifier respectively and output is obtained from pin no 6. Here IC 2 (timer IC NE555) is used as monostable multivibrator. The timing component of anti bag snatching alarm is R 5 , VR 1 , and capacitor C 2 with the given value in this circuit diagram lets the time of timer is about 1 minute. For audio section, IC 3 is used as alarm tone generator with an inbuilt oscillator. Finally the output is obtained from pin no 3 of IC 3 and amplified by transistor T 1 in order to get desire level and lastly fed to loudspeaker for output. Simple Anti Bag Snatching Alarm Circuit Diagram PARTS LIST Resistors (all ¼-watt, ± 5% Carbon) R 1 , R 2 , R 3 = 100 KΩ R 4 , R 6 = 10 KΩ R 5 = 10 MΩ R 7 = 330 Ω R 8 = 220 KΩ R ...