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.

fier.doc

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