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IR INTRUDER ALARM
(ELECTRONICS CIRCUIT DESIGN LAB)
Presented By:-
PRASHANT SRIVASTAVA(1110434099)
PRATYUSH(1110434100)
CONTENTS
TRANSMITTER CIRCUIT
TRANSMITTER THEORY
RECIEVER CIRCUIT
RECIEVER THEORY
LIST OF PARTS
PCB LAYOUT
APPLICATION
REFERENCES
TRANSMITTER CIRCUIT
TRANSMITTER THEORY
The transmitter section is built around IC 555 (IC1),
which is wired as an astable multivibrator.
It produces about 38kHz frequency.
IR LED1 emits 38kHz modulated signals up to a
distance of 4.6 metres (15 feet).
The modulated IR beam from the transmitter
continuously falls on the receiver section.
RECEIVER CIRCUIT
RECEIVER THEORY
The receiver sensor TSOP1738 responds to
38kHz frequency.
The modulated IR beam falling on receiver
sensor TSOP1738 makes its output low.
When somebody crosses the path of IR rays it
senses this and its output goes high momentarily,
which triggers the flip-flop.
In the reciever circuit the flip-flop circuit uses IC
CD4011.
The IR transmitter and receiver units are
mounted opposite to each other on the sides of
entry door or gate.
LIST OF PARTS
Semiconductors:
D1 - 1N4148
IRLED1 - Flat LED
ZD1 -5.1 volts
IC1 -NE555
IC2 (N1-N2) -CD4011
Resistors:
R1 - 6.8 K ohm
R2 - 100 K ohm
R3 - 10 K ohm
R4 - 18 ohm
R5 - 150 ohm
R6 - 22 kilo ohm
R7- 270 K ohm,
0.5 watt
R8 - 10 K ohm
R9- 680 ohm
Capacitors
C1- 100 µF, 16 volt
C2 - 220 pF
C3- 0.01µF
C4- 100 µF, 16 volt
C5- 6.8 µF, 16 volt
Miscellaneous:
S1- ON/OFF switch
PZ1 (Piezo buzzer)
PCB LAYOUT
APPLICATION
Home Security Systems.
Prisons Security.
 Vehicle Security.
Broadband alarm monitoring.
Glass Break.
Property Theft Alarm.
REFERENCES
http://www.eleccircuit.com/infrared-
intruder-alarm/
http://electronicsforu.com/electronicsforu/
circuitarchives/view_article.asp?sno=1032&
article_type=1&id=888&tt=unhot
THANK YOU

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IR INTRUDER ALARM