Fire Alarm Electronic Circuit for FS PCBA

Similar to an alarm clock, a fire alarm is a basic electronic circuit that provides the functionality to detect surrounding thermal disturbances and activate a buzzer. Such circuits are ideal for use in infrastructure to keep equipment and materials safe. To ensure safety in the future of modern society, it must exist in commercial buildings, offices, shopping malls, etc. So let's make our fire alarm project and understand the concept behind it.

1×UTSource LM358 Amplifier

1×UTSource 10K Thermistor

1×UTSource 10K ohm Potentiometer

1×UTSource 10K ohm Resistor

1×UTSource 5v Buzzer

The most important component used in fire circuit alarms is the 10k thermistor because it has a negative temperature coefficient (NTC). So, every time the resistance of the circuit decreases, the voltage across the circuit increases, which creates more current regulation in the circuit, which allows the buzzer to turn on and indicate that a fire is detected around it. So this is the basic principle of the fire alarm circuit.

1. Plug the LM358 amplifier into the PCBA board, refer to the circuit diagram above.

2.Now place the potentiometer on the FS PCBA board next to our LM358 amplifier

3. Connect pin 8 and pin 4 of LM358 to potentiometer.

4. Connect the pins of the LM358 to the positive rail of the PCBA board.

5. Connect the 10k ohm thermistor on the PCBA board.

6. Now connect the 10k ohm resistor on the PCBA board as shown below

7. Now connect the buzzer on the PCBA board.

8. Now connect the positive rail of the PCBA board to the negative rail of the PCBA board as shown.

9. Connect the power supply, the positive pole is connected to the positive pole of the PCBA board, and the negative pole is connected to the negative pole of the PCBA board.

10. When we bring the igniter close to the thermistor, the buzzer will turn on and make a dangerous sound