10-07-2015, 10:46 PM
Hii I m Binay Kumar das I want this ppt because m doing this project and I hope so u may help by giving this ppt thank you...
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ppt on anti bag snatching alarm
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Hii I m Binay Kumar das I want this ppt because m doing this project and I hope so u may help by giving this ppt thank you...
11-07-2015, 09:34 AM
ppt on anti bag snatching alarm
Here is a very simple as well as very useful project anti bag snatching alarm, used in bag or suitcase in order to prevent from snatching. The sound produced by anti bag snatching alarm is like police horn to get attention of people when someone attempt to snatch your bag or suitcase.
Circuit Description of anti bag snatching alarm
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.
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 mega-ohms) 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. IC UM3561 is a complex ROM with an inbuilt oscillator. Resistor R8 forms the oscillator component. Its output is fed to the base of 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 collector of T1 to produce the alarm. The alarm can be put off if the plug is inserted into the socket again. Transistor T1 requires a heat-sink.
Resistor R7 (330 ohms) limits the current to IC3 and zener diode ZD1 limits the supply voltage to IC3 to a safe level of 3.3 volts. Resistor R9 limits the current to the base of T1.
The circuit can be easily constructed on a vero board or general-purpose PCB. Use a small case for housing the circuit and 9V battery. The speaker should be small so as to make the gadget handy. Connect a thin plastic wire to the plug and secure it in your hand or tie up somewhere else so that when the bag is pulled, the plug detaches from the socket easily.
Here is a very simple as well as very useful project anti bag snatching alarm, used in bag or suitcase in order to prevent from snatching. The sound produced by anti bag snatching alarm is like police horn to get attention of people when someone attempt to snatch your bag or suitcase.
Circuit Description of anti bag snatching alarm
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.
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 mega-ohms) 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. IC UM3561 is a complex ROM with an inbuilt oscillator. Resistor R8 forms the oscillator component. Its output is fed to the base of 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 collector of T1 to produce the alarm. The alarm can be put off if the plug is inserted into the socket again. Transistor T1 requires a heat-sink.
Resistor R7 (330 ohms) limits the current to IC3 and zener diode ZD1 limits the supply voltage to IC3 to a safe level of 3.3 volts. Resistor R9 limits the current to the base of T1.
The circuit can be easily constructed on a vero board or general-purpose PCB. Use a small case for housing the circuit and 9V battery. The speaker should be small so as to make the gadget handy. Connect a thin plastic wire to the plug and secure it in your hand or tie up somewhere else so that when the bag is pulled, the plug detaches from the socket easily.
11-10-2017, 02:10 AM
plz can I get the introduction of the anti bag snatching alarm
17-10-2017, 11:49 AM
Here is a simple alarm circuit to thwart the theft of your valuables while traveling. The circuit stored in your purse or suitcase sounds a great alarm, simulating a police horn, if someone tries to snatch your bag or suitcase. This will attract the attention of other passengers and the thief can be caught with his hands in the dough. In standby mode, the circuit is blocked by a plug-and-socket arrangement (a mono plug with short-circuited cables plugged into the unit's mono-jack). When the thief tries to snatch the bag, the plug separates from the base of the unit to activate the alarm.
![[Image: 2D6_feb_23_efy.png]](http://electronicsforu.com/wp-contents/uploads/2016/05/2D6_feb_23_efy.png)
The circuit is designed around the CA3140 IC amplifier option (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 4.5V) by the potential divider comprising resistors R2 and R3 of 100 kilohms each. The inverter input (pin 2) of IC1 is kept low through the short-circuited plug in the socket. As a result, the voltage at the non-inverting input is higher than at the inverting input and the output from IC 1 is high.
The output of the pin 6 of IC1 is fed to the trip pin 2 of IC NE555 (IC2) through the coupling capacitor C1 (0.0047 μF). IC2 is configured as a monostable. Its trigger pin 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 reset pin 4 of IC2, prevents any false activation. The R5 resistor (10 megohms), the preset VR (10 megohms) and the capacitor C2 (4.7 mF, 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 predetermined VR.
When there is an attempt to snatch, the plug connected to the circuit is separated. 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 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 by IC3 is amplified by transistor T1. A loudspeaker is connected to the T1 collector to produce the alarm. The alarm can be delayed if the plug is inserted into the socket again. 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 general purpose PCB. Use a small box to accommodate the circuit and 9V battery. The speaker should be small so the gadget is useful. Connect a thin plastic cable to the plug and secure it by hand or tie it aside so that when the plug is pulled, the plug is easily detached from the plug.
It can be understood in the following video:
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