火灾报警电路是利用两个温度传感器输出的差值来判断室内是否有火灾，然后运用的是一个差分放大电路，根据实际需要，我们可以适当的改变放大的倍数，这样可以避免温漂使设计的产品更有实用性。接着使用的是一个单限电压比较器，这样可以选择性的让危险电压值通过，最后实现报警。在报警的时候，首先会运用一个发光二极管，在电压达到一定值的时候，发光二极管就会伴同蜂鸣器一起工作，一边发光一边有声音，达到报警的作用。-Fire alarm circuit is the use of the difference between the two temperature sensor output to determine whether the fire room, and then use a differential amplifier circuit, according to actual needs, we can change the magnification of appropriate multiples, so avoid the drift to the design products more practical. Then using a single-limit voltage comparator, this can be selective so dangerous voltage values, and finally an alarm. In the alarm, the first will use a light-emitting diode, the voltage reaches a certain value when the LED will be accompanied by a buzzer to work together, side light side of a voice, to the role of police.