Fire Alarm Circuit is one of the simple and cool projects in electronics it detects the fire using a thermistor and

activates the alarming sound with buzzer. Fire Alarms has
important practical application in industries where it is necessary to detect
fire on right time and prevent damages to people or property.

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Hardware Required

Useful Steps

Follow all steps carefully from the video tutorial at the end of this post (Highly Recommended).

1) Step 1: Solder LM358 IC base and place ic on it

2) Step 2: Solder Trimmer Pot & 10k Resistor

3) Step 3: Solder Thermister and Buzzer

4) Step 4: Solder Power connector

5) Step 5: Power up the Circuit & Adjust Sensitivity

Circuit Diagram

fire alarm circuit