police siren security alarm
TRANSCRIPT
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POLICE SIREN SECURITY ALARM
GRACE JEAN D. FERNANDEZ
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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
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SIGNIFICANCE
SECURE PROPERTI
ES
SECURE HOUSES
ANTI- THEFT
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FUNCTION DIAGRAMSWITCH LASER LDR
ASTABLE CIRCUIT is
OFF
ASTABLE CIRCUIT is
ON
BUZZER
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CIRCUIT FLOW
Dark Detector Circuit
Astable Multivibrator Circuit
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DARK DETECTOR CIRCUIT (1)
LDR is at MINIMUM VALUE
When it detects NO light
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DARK DETECTOR CIRCUIT (2)
LDR is at MAXIMUM VALUE
When the LASER is directed
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ASTABLE MULTIVIBRATOR CIRCUIT (STATE 1)
ON
OFF
470
47010K 10K
100uF
100uF
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ASTABLE MULTIVIBRATOR CIRCUIT (STATE 2)
ON
OFF
470
470
10K 10K
100uF
100uF