The purpose of this device is to register the occurrence of open flames.
The device is made with operational amplifier 741 which works as a comparator. With the appearance of an open flame, the IC transistor changes the potential on the third pin and the amplifier at the output of the seventh pin changes state and turns on the LED, turns on a transistor that turns on a relay that turns on a piezo siren and can include fire extinguishers. stabilizer 7812.
The special feature of this device is the simplicity of construction, relatively good reliability and low cost of production.
