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Fire Alarm

The document outlines a college project on a fire alarm system using a BC547 transistor and an infrared receiver LED. It describes the components, working mechanism, and applications of the fire alarm circuit, emphasizing its role in early fire detection and prevention. This project serves as an educational tool for students to understand sensor-based detection and basic electronics.

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sutharkaushik0035
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45 views5 pages

Fire Alarm

The document outlines a college project on a fire alarm system using a BC547 transistor and an infrared receiver LED. It describes the components, working mechanism, and applications of the fire alarm circuit, emphasizing its role in early fire detection and prevention. This project serves as an educational tool for students to understand sensor-based detection and basic electronics.

Uploaded by

sutharkaushik0035
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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INTRODUCTION

NAME: KAUSHIK JOGARAM SUTHAR

COLLEGE NAME: SRJC SHUBHAM RAJE


JUNIOR COLLEGE

ROLL NUMBER: 3948

SUBJECT: ELECTRONICS

PROJECT TOPIC: FIRE ALARM


Fire Alarm System Using BC547
Transistor – College Project
Introduction
Fire alarm systems play a crucial role in detecting fires at an early
stage and preventing damage to life and property.

This project demonstrates a simple fire alarm circuit using a BC547


transistor and an infrared (IR) receiver LED.

The system detects fire using infrared radiation and triggers an alert
through a buzzer and LED.

It is an ideal project for college students to learn about sensor-based


fire detection and basic transistor switching circuits.
Component List
1. BC547 Transistor (NPN) - 1 No
o Acts as a switch to activate the alarm when fire is
detected.
2. Infrared Receiver (IR) LED - 1 No
o Detects infrared radiation (heat) emitted by flames.
3. 220-ohm Resistor - 1 No
o Limits current flow to protect the LED and
transistor.
4. LED (5mm) - 1 No
o Provides a visual indication when fire is detected.
5. DC Buzzer - 1 No
o Produces a sound alert to warn people of fire.
6. 5V DC Supply or 9V Battery
o Powers the circuit.
7. Breadboard
o Helps in assembling the circuit without soldering.
Working of Fire Alarm System
1. Normal Condition (No Fire)
o The infrared (IR) receiver LED does not detect any
infrared radiation.
o The BC547 transistor remains OFF, preventing
current from flowing through the circuit.
o The LED and buzzer remain OFF, indicating there is
no fire.
2. Fire Detection Condition
o When fire occurs, it emits infrared radiation (heat
waves).
o The IR receiver LED detects this infrared light and
sends a small signal to the BC547 transistor.
o This activates the BC547 transistor, allowing current
to flow through the circuit.
o As a result:
 The LED turns ON, providing a visual alert.
 The buzzer is activated, producing a loud
sound alert.
o This ensures early fire detection, allowing people to
take immediate action to prevent further damage.
Applications of This Fire Alarm Circuit
1. Home Safety
o Can be used in kitchens and bedrooms to detect fire
early.
2. Offices and Workplaces
o Helps prevent fire accidents by providing an early
warning.
3. Laboratories
o Useful in chemistry labs where flammable substances
are used.
4. Small Shops and Storage Rooms
o Protects goods from fire damage.
5. School and College Projects
o A great educational project for students to learn
about basic electronics

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