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Anti-Bag-Snatching Alarm pdf
Post: #1

Anti-Bag-Snatching Alarm


.pdf  Anti-Bag-Snatching.pdf (Size: 41.81 KB / Downloads: 30)

Here is a simple alarm circuit to thwart snatching of your valuables while travelling. The circuit kept in your bag or suitcase sounds a
loud alarm, simulating a police horn, if someone attempts to snatch your bag or suitcase. This will draw the attention of other passengers and the burglar can be caught red handed. In the standby mode, the circuit is locked by a plug and socket arrangement (a mono plug with shorted leads plugged into the mono-jack socket of the unit). When the burglar tries to snatch the bag, the plug detaches from the unit’s socket to activate the alarm. The circuit is designed around op-amp IC CA3140 (IC1), which is configured as a comparator. The non-inverting input (pin 3) of IC1 is kept at half the supply voltage (around 4.5V) by the potential divider comprising resistors R2 and R3 of 100 kilo-ohms each. The inverting input (pin 2) of IC1 is kept low through the shorted plug at the socket. As a result, the voltage at the non-inverting input is higher than at the inverting input and the output of IC1 is high.
The output from pin 6 of IC1 is fed to trigger pin 2 of IC NE555 (IC2) via coupling capacitor C1 (0.0047 μF). IC2 is configured as a monostable. Its trigger pin 2 is held high by resistor R4 (10 kilo-ohms). Normally, the output of IC2 remains low and
the alarm is off. Resistor R6, along with capacitor C3 connected to reset pin 4 of IC2, prevents any false triggering. Resistor R5 (10 mega-ohms), preset VR (10 megaohms) and capacitor C2 (4.7 μF, 16V) are
timing components. With these values, the output at pin 3 of IC2 is about one minute, which can be increased by increasing either the value of capacitor C2 or preset VR. When there is an attempt at snatching, the plug connected to the circuit detaches. At that moment, the voltage at the inverting input of IC1 exceeds the voltage at the non-inverting input and subsequently its output goes low. This sends a low pulse to trigger pin 2 of IC2 to make its output pin 3 high. Consequently, the alarm circuit built around IC UM3561 (IC3) gets the
supply voltage at its pin 5.
Post: #2
please I need the doc of the anti bag snatching alarm
Post: #3

Here is a simple alarm circuit to thwart snatching of your valuables while traveling. The circuit stored in your suitcase or suitcase sounds a loud alarm, simulating a police horn, if someone tries to snatch the suitcase or suitcase. This will catch the attention of other passengers and the thief can be trapped in red hands. In standby mode, the circuit is blocked by a plug-in connection (a mono plug with short-circuited cables plugged into the unit's mono-jack). When the thief tries to snatch the bag, the plug is disconnected from the unit receptacle to activate the alarm.

[Image: 2D6_feb_23_efy.png]


The circuit is designed around the operational amplifier IC CA3140 (IC1), which is configured as a comparator. The non-inverting input (pin 3) of IC1 is maintained at the middle of the supply voltage (about 4.5 V) by the potential divider comprising resistors R2 and R3 of 100 kilo-ohms each. The inverter input (pin 2) of IC1 is kept low through the short-circuit plug in the socket. As a result, the voltage at the non-inverting input is greater than at the inverting input and the output of IC1 is high.

The output of the pin 6 of IC1 is fed to the activating pin 2 of IC NE555 (IC2) through the coupling capacitor C1 (0.0047 μF). IC2 is configured as monostable. Its trigger 2 is held high by the R4 resistor (10 kilo-ohms). Normally, the IC2 output remains low and the alarm is off. The resistor R6, together with the capacitor C3 connected to the reset pin 4 of IC2, prevents any false tripping. The R5 resistor (10 mega ohms), the preselected VR (10 mega ohms) and the capacitor C2 (4.7 μF, 16V) are timing components. With these values, the output at pin 3 of IC2 is approximately one minute, which can be increased by increasing the value of the capacitor C2 or the preset VR.

When there is an attempt to snatch, the plug connected to the circuit is disconnected. At that time, the voltage at the inverting input of IC1 exceeds the voltage at the non-inverting input and subsequently its low output. This sends a low pulse to activate the pin 2 of IC2 to make its output pin 3 high. Consequently, the alarm circuit built around IC UM3561 (IC3) obtains the supply voltage at its pin 5. IC UM3561 is a complex ROM with a built-in oscillator. The resistor R8 forms the oscillator component. Its output is fed to the base of the single-stage transistor amplifier BD139 (T1) through resistor R9 (1 kilo-ohm).

The alarm tone generated from IC3 is amplified by transistor T1. A loudspeaker is connected to the T1 collector to produce the alarm. The alarm can be switched off if the plug is reinserted into the socket. Transistor T1 requires a heat sink.

The resistance R7 (330 ohms) limits the current to IC3 and the zener diode ZD1 limits the supply voltage to IC3 to a safe level of 3.3 volts. Resistance R9 limits the current to the base of T1.

The circuit can be easily built into a vero board or a general purpose PCB. Use a small box to house the circuit and the 9V battery. The speaker should be small to make the gadget handy. Attach a thin plastic cable to the plug and secure it in your hand or tie it in another place so that when the bag is pulled, the plug is easily detached from the plug.
 

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