SlideShare a Scribd company logo
POLICE SIREN
SECURITY ALARM
GRACE JEAN D. FERNANDEZ
 This is a security system which produces
a wailing sound and alarms when there is
an intruder or when there is someone
interrupting the sensor.
DESCRIPTION
SIGNIFICANCE
SECURE
PROPERTIES
SECURE
HOUSES
ANTI- THEFT
FUNCTION DIAGRAM
SWITCH LASER LDR
ASTABLE
CIRCUIT is OFF
ASTABLE
CIRCUIT is
ON
BUZZER
CIRCUIT FLOW
DARK DETECTOR CIRCUIT (1)
DARK DETECTOR CIRCUIT (2)
ASTABLE MULTIVIBRATOR CIRCUIT (STATE 1)
ON OFF
470 470
10K 10K
100uF
100uF
ASTABLE MULTIVIBRATOR CIRCUIT (STATE 2)
ONOFF
470 470
10K 10K
100uF
100uF

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