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Heat alarm Using NPN Transistor BC547


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  • Thermistor:
    • A thermistor is a temperature-sensitive resistor. Its resistance changes with temperature, allowing it to be used as a temperature sensor.
  • NPN Transistor (BC547):
    • The NPN transistor is used as a switch. When the temperature reaches a certain level, the thermistor’s resistance changes, affecting the biasing of the transistor.
  • Resistor (R1):
    • A resistor is connected in series with the thermistor to form a voltage divider. The junction between the thermistor and the resistor is connected to the base of the NPN transistor.
  • Buzzer or Alarm:
    • A buzzer or alarm is connected to the collector of the NPN transistor. When the temperature rises and the transistor turns on, the alarm is activated


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