Description
This Fire Alarm Circuit project includes a fire sensor called as Thermistor, which is connected to a Transistor.
When a burning match stick is brought near the thermistor, the temperature rises and the internal resistance drops to a certain extent which allows the current to flow through the base of Transistor which further turns ON the buzzer. At higher temperatures, i.e., under fire conditions, buzzer will start alarming and under normal conditions, the alarm remains switched off.
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