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Failsafe module

  • US 5,373,281 A
  • Filed: 07/29/1993
  • Issued: 12/13/1994
  • Est. Priority Date: 08/15/1991
  • Status: Expired due to Term
First Claim
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1. A warning circuit for activating one or more of a plurality of dashboard mounted vehicle warning lamps and an audible indicator in response to a plurality of sensed conditions comprising:

  • a) input means comprising terminals for receiving a plurality of status-indicating warning signals;

    b) oscillator means for providing a single oscillatory signal at a lamp flash frequency;

    c) switch means coupled to the oscillator means and having a plurality of switches coupled to the input means wherein each switch of the plurality of switches responds to receipt of an associated one of the status-indicating warning signals to transmit the oscillating signal to a switch output;

    d) output means having a plurality of voltage regulators having an input coupled to switch outputs of the plurality of switches and having an output to provide regulated output signals at the lamp flash frequency for activating one or more of the vehicle warning lamps;

    e) audible indicator means comprising;

    i) an audible oscillator circuit for providing an audible output signal in an audible range; and

    ii) sound generating means coupled to an output of said audible oscillator circuit for providing an audible tone;

    said audible indicator means coupled to the input means and responsive to receipt of a status-indicating warning signal to actuate the audible oscillator circuit; and

    f) a user actuated dimmer circuit coupled to the output means for reducing a reference input to the plurality of regulated output signals from the output means to reduce light output from activated dashboard mounted vehicle warning lamps coupled to the output means.

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