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Electron Devices Lab (EC1009) 
Mini Project - Fire Alarm 
2014 - 2015 III Semester 
Technical Abstract 
Group members: 
Ram Kumar J K 1041310288 
Ratul Vijh 1041310299 
SRM-KTR Page 0
Fire Alarm 
EC1009 Mini Project 
This is a typical Fire alarm circuit. This is a mini 
project assignment for Electron Devices Lab (EC1009). 
I would like to emphasis on the fact that both 
members of the group was an integral part of the 
whole process and had our fair share of learning 
experience. We worked as a unified, cohesive team, 
where our contribution has been accounted for the 
successful completion.The Fire alarm is constructed 
on a PCB fabrication board. 
SRM-KTR Page 1
The Working: The heat is sensed using a Thremo 
couple; therefore a voltage drop is created. The 
voltage drop is divided into two using a Potential 
Divider. The current is then passed into IC2 
(operational Amplifier). In that IC, the reference 
voltage is set as Vref. Its function is to compare the 
input voltage and the reference voltage. If the input 
voltage is lesser than the reference voltage, the 
output is not drawn. But if the input voltage is greater 
than the reference voltage, the IC conducts and the 
output is obtained. After that, the output voltage 
passes through a Bipolar Junction Transistor (BJT) 
which amplifies the output (Amplification action). The 
amplification is required to trigger the buzzer. Then it 
passes into 8-Pin IC555 Timer. The input enters the IC 
by input terminal 2 (trigger). The input analogous 
signal is converted in a digital square wave signal. 
Then we get an output from terminal 3. The voltage 
then divides into two, one to the BJT and another to 
the LED. The function of BJT is to perform switch 
action. Then the buzzer gives an alternating ‘BEEP’ 
sound. This circuit works in 9V DC supply, which is 
given by a standard 9V battery. 
SRM-KTR Page 2
Circuit (rough) : 
SRM-KTR Page 3
Teacher Remarks / Comments: 
SRM-KTR Page 4

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Fire alarm ec1009

  • 1. Electron Devices Lab (EC1009) Mini Project - Fire Alarm 2014 - 2015 III Semester Technical Abstract Group members: Ram Kumar J K 1041310288 Ratul Vijh 1041310299 SRM-KTR Page 0
  • 2. Fire Alarm EC1009 Mini Project This is a typical Fire alarm circuit. This is a mini project assignment for Electron Devices Lab (EC1009). I would like to emphasis on the fact that both members of the group was an integral part of the whole process and had our fair share of learning experience. We worked as a unified, cohesive team, where our contribution has been accounted for the successful completion.The Fire alarm is constructed on a PCB fabrication board. SRM-KTR Page 1
  • 3. The Working: The heat is sensed using a Thremo couple; therefore a voltage drop is created. The voltage drop is divided into two using a Potential Divider. The current is then passed into IC2 (operational Amplifier). In that IC, the reference voltage is set as Vref. Its function is to compare the input voltage and the reference voltage. If the input voltage is lesser than the reference voltage, the output is not drawn. But if the input voltage is greater than the reference voltage, the IC conducts and the output is obtained. After that, the output voltage passes through a Bipolar Junction Transistor (BJT) which amplifies the output (Amplification action). The amplification is required to trigger the buzzer. Then it passes into 8-Pin IC555 Timer. The input enters the IC by input terminal 2 (trigger). The input analogous signal is converted in a digital square wave signal. Then we get an output from terminal 3. The voltage then divides into two, one to the BJT and another to the LED. The function of BJT is to perform switch action. Then the buzzer gives an alternating ‘BEEP’ sound. This circuit works in 9V DC supply, which is given by a standard 9V battery. SRM-KTR Page 2
  • 4. Circuit (rough) : SRM-KTR Page 3
  • 5. Teacher Remarks / Comments: SRM-KTR Page 4