intruder alarm conveniently
at the entrance of a hall or any
other similar location to protect the
same from unauthorised access as and
when desired. Its range can be extended
further to protect the perimeter of a
building from unauthorised intrusion
by using a cascade arrangement of
multiple alarms.
The circuit consists of a transmitter
and a receiver.
The transmitter circuit (shown in
Fig. 1) is nothing but a laser diode
(LD1) driven by a 9V PP3 battery. The
output of IC1 is regulated 5V as long as
its input remains equal to or more than
7.5V, thus ensuring a constant drive
current for the laser diode. The battery
(Batt1) is connected to the circuit
through switch S1.
The laser diode (LD1) can be
replaced with a laser pointer (torch)
emitting red laser beam. The laser
pointer itself can be used as a transmitter.
The pointer has in-built series
resistance, on/off switch and battery.
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ReplyDeleteits wrong... connect the 22k resistor between pin 3 and pin 6 of lm356 ic instead of pin 2 n pin 6... it is bcoz the feedback has to be positive in this case... i have impremented it in my final year project and it worked when the feedback was made positive...
ReplyDeleteand thanks for this post, it helped me a lot..
These intruder alarms and security alarms are more reliable than common security alarm systems.
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