advantages of multi tone siren

A siren is a loud noise making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars and fire trucks. There are two general types: pneumatic and electronic.

Many fire sirens (used for calling the volunteer fire fighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire sirens are either mounted on the roof of a fire ....etc

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Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This little and flexible circuit consists of a touch sensor and a directly coupled transistor amplifier with a small loudspeaker as the output load. Two sensor strips of metal are mounted side by side on a 1 1 cm size micasheet and connected to the input of the circuit.

How the touch alarm works

Under normal conditions no current flows through switching transistors T1 and T2 and the potential acros ....etc

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am doing project on this topic so please i wanna to the futher information about dis topic ....etc

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respected sir/madam

kindly upload the full pdf offinger print phenomenon of biometrics for security of vital places as soon as possible.
if you can't upload here then just mail me [email protected]

thanking you
your sincerly
Raja
IIT
B.TECH (3rd year,ECE) ....etc

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ABSTRACT
This research focuses on detection of unauthorized access to residential and commercial buildings when
the residents are far away from the access gate of the house. The system is a simple and reliable touch
activated security system and uses sensor technology to revolutionize the standards of living. The system
provides a best solution to most of the problems faced by house owners in their daily life. Due to its
simple electronic components nature, it is more adaptable and cost-effective. The system is divided into
three units; t ....etc

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four tone siren

Operation of four siren sound generator circuit using UM3561, IC1 number ready to create a sound all four sound at pin 7, 8 of IC1 to the R1, VR1 to take to control the frequency of oscillator circuit the internal IC. If the VR1 adjust less frequently and will increase, if VR1 adjusts the frequency that would cost a lot less. When the power supply is integrated into the police car sirens sound out.If the switch S1 will press space, press switch S2 sound gun will fire if the sirens sound, press switch S3 ambulance sirens will s ....etc

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to get information about the topic gi fi technology full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-gi-fi ....etc

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ADVANTAGES OF TOUCH SENSITIVE SIREN AND DETAILS OF CIRCUIT DIAGRAM, WORKING , REQUIREMENTS , APPLICATIONS
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to get information about the topic wireless fedility full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-wi-fi-wireless-fidelity-with-ppt-and-doc

http://seminarsprojects.net/Thread-wireless-fidelity-full-report?pid=16332&mode=threaded

http://seminarsprojects.net/Thread-wireless-fidelity ....etc

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please help me find an abstract for four tone siren and it description

please give me about abstract of four tone siren ..i have to submit this project today so help me

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