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DEVICE WITH PRECISION FREQUENCY STABILIZED AUDIBLE ALARM CIRCUIT

  • US 20170193762A1
  • Filed: 12/30/2015
  • Published: 07/06/2017
  • Est. Priority Date: 12/30/2015
  • Status: Abandoned Application
First Claim
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1. A device, comprising:

  • a three terminal piezo-electric buzzer;

    driver circuitry coupled to the piezo-electric buzzer and operative to drive operation of the piezo-electric buzzer, wherein the operation of the piezo-electric buzzer is characterized by a resonant frequency and buzzer phase; and

    compensation circuitry coupled to the piezo-electric buzzer and the driver circuitry to complete a circuit loop comprising the driver circuitry, the piezo-electric buzzer, and the compensation circuitry, the compensation circuitry operative to assist the driver circuitry in maintaining the piezo-electric buzzer in a stable oscillation by injecting additional phase into the circuit loop to supplement the buzzer phase and to enable the piezo-electric buzzer to operate at, or near, the resonant frequency.

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