Simple Anti Bag Snatching Alarm Circuit Diagram

Simple Anti Bag Snatching Alarm Circuit Diagram. The heart of this entire circuit anti bag snatching alarm is operational amplifier IC CA3140 (IC₁), 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 IC₂ (timer IC NE555) is used as monostable multivibrator. The timing component of anti bag snatching alarm is R₅, VR₁, and capacitor C₂ with the given value in this circuit diagram lets the time of timer is about 1 minute.

For audio section, IC₃ is used as alarm tone generator with an inbuilt oscillator. Finally the output is obtained from pin no 3 of IC₃ and amplified by transistor T₁ 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)

R₁, R₂, R₃ = 100 KΩ

R₄, R₆ = 10 KΩ

R₅ = 10 MΩ

R₇ = 330 Ω

R₈ = 220 KΩ

R₉ = 1 KΩ

VR₁ = 10 MΩ

Capacitors

C₁, C₃ = 0.0047 µF

C₂ = 4.7 µF/16V

C₄ = 0.01 µF

Semiconductors

IC₁ = CA3140 (operational amplifier)

IC₂ = NE555 (timer IC)

IC₃ = UM3561 (complex ROM with an inbuilt oscillator)

T₁ = BD139

ZD₁ = 3.3V 500mA

Miscellaneous

SW₁ = ON/OFF switch

L₁ = speaker 8Ω 1W

Mono plug, mono jack 8

Comments

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