The fire alarm is one of those alarms, to immediately protect surroundings from fire. Here we design a simple “Fire Alarm Project” by using a 10K NTC (Negative Temperature Coefficient) thermistor and LM368 Operational Amplifier IC.

This Simple Fire Alarm Project can be used as an indicator or warning circuit for excessive fire and temperature, to connect or disconnect the target device you can connect a relay at the output. Moreover, it prevents the machines and environment from any hazardous or physical harm

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5$ PCB Prototype

Hardware Components

Circuit Diagram