FIRE ALARM Russian patent published in 2012 - IPC G08B17/00 

FIELD: fire safety.

SUBSTANCE: fire alarm comprises a sensor that emits piezoacoustic converter, bus of zero potential, generator of ultrasonic vibrations, unit of comparison, display unit, the first and second amplifiers, voltage regulator, the first and second current to voltage converters, load element. The sensor is an extended heat-resistant ultrasound waveguide coupled with the input to the output of the emitting piezoacoustic converter. Output of the unit of comparison is connected to the input of the display unit of fire. The first power terminals of the first and second amplifiers are connected with the bus of zero potential connected to the first output pin of the voltage regulator. Input of the second amplifier is connected to the output of the generator of ultrasonic vibrations and to the input of the first amplifier. The output of the first amplifier is connected to the input of the emitting piezoacoustic converter. The load element is connected between the output of the second amplifier and the bus of zero potential. The first outputs of the first and second current to voltage converters are connected to the second output pin of the voltage regulator, and their second outputs are connected respectively to the second power terminals of the first and second amplifiers. The output of the first and the output of the second current to voltage converters are connected respectively to first and second inputs of the unit of comparison.

EFFECT: design simplification of the fire alarm.

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