Basic Simple Fire Alarm Circuit Diagram

This simple fire alarm circuit can be used as a indicator or warning circuit for excessive fire and temperature.

Basic simple fire alarm circuit diagram. Thermistor is temperature sensitive resistor whose resistance changes according to the temperature its resistance decreases with the increase in temperature and vice versa. This project covers a simple fire alarm circuit using thermistor and 555 timer ic. 1 x 10 k thermistor. Simple fire alarm circuit designed by using 10k ntc negative temperature coefficient thermistor and timer ic 555 this circuit will produce buzzer sound when the temperature near thermistor raises beyond threshold and this threshold limit can be varied by using variable resistor.

Here is a simple fire alarm circuit based on a light dependent resistor ldr and lamp pair for sensing the fire. Variety of fire alarm installation wiring diagram. In this article let us discuss about simple fire alarm circuit using thermistor. Circuit 1 simple fire alarm circuit this is a very simple alarm circuit using thermistor lm358 operational amplifier and a buzzer.

It shows the parts of the circuit as streamlined shapes as well as the power as well as signal connections in between the gadgets. 1 x lm358 operational amplifier op amp. The most essential electronic device at home or industry or any other place where there is a chance of fire accident is a fire alarm circuit. When there is no smoke the light from the bulb will be directly falling on the ldr.

The circuit diagram of this simple fire alarm project is shown in the following image. A wiring diagram is a simplified conventional pictorial depiction of an electrical circuit. The circuit produces an audible alarm when the fire breaks out with smoke. The alarm works by sensing the smoke produced during fire.