HIGH OUTPUT AUDIBLE ALARM DEVICE UTILIZING A PIEZOELECTRIC TRANSDUCER AND VOLTAGE DOUBLING MEANS

摘要

HIGH OUTPUT AUDIBLE ALARM DEVICE UTILIZING A PIEZOELECTRIC TRANSDUCER AND VOLTAGE DOUBLING MEANS A high output audible alarm having a power supply, a pulsator responsive to the power supply, an amplifier coupled to the pulsator for oscillating the power supply input voltage, and a piezoelectric transducer responsive to the amplifier also includes a circuit responsive to a plurality of electrical pulses of opposite polarities for doubling the voltage of the power supply to supply a drive voltage to the piezoelectric transducer which is double the power supply input voltage.