Multiple signal audible oscillation generator

  • US 6,310,540 B1
  • Filed: 12/17/1996
  • Issued: 10/30/2001
  • Est. Priority Date: 12/17/1996
  • Status: Expired due to Term
First Claim
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1. A circuit for selectively generating electrical oscillations in the audible frequency range comprisingmeans for providing a supply voltage;

  • a controller having a controller input and a controller output; and

    a driving circuit coupled to the controller output and operating in a manner to supply an amplitude of about twice the supply voltage;

    the controller selectively responsive to a plurality of selection signals whereby upon receipt by the controller input of a predetermined one of the plurality of selection signals, the controller generates a corresponding sequence of electrical oscillations at the controller output, the oscillations essentially in the audible frequency range;

    the driving circuit comprising first and second inverters each having a respective inverter input and inverter output;

    a switch operatively coupled to the controller output and responsive to the oscillations thereupon to allow a high potential state to appear at the first inverter input during one of respective high and low phases of the oscillations and a low potential state to appear during the other of respective high and low phases of the oscillations;

    the second inverter input electrically coupled to the first inverter output.

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