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Turn signal monitor circuit

  • US 5,414,407 A
  • Filed: 05/10/1993
  • Issued: 05/09/1995
  • Est. Priority Date: 05/10/1993
  • Status: Expired due to Fees
First Claim
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1. A non-obtrusive turn signal monitor and reminder circuit for monitoring a turn signal in a vehicle and reminding an operator after a set time period, the turn signal monitor and reminder circuit comprising:

  • a turn signal circuit activated to provide a pulsating signal;

    a converter coupled to the turn signal circuit for converting the pulsating signal into a direct current output signal while the turn signal is activated;

    a first timer coupled to the converter for providing a first timer output signal wherein the first timer is powered by the converter output signal, the first timer comprising;

    first adjustable delay means for providing a delay time period before providing the first timer output signal; and

    resetting means for suspending the first adjustable delay means upon the occurrence of a specified event;

    a second timer directly coupled to the first timer for providing an intermittent alarm driver signal in response to the first timer output signal, the intermittent driver signal having an on time and an off time independent of the frequency of the turn signal circuit pulsating signal, the second timer comprising;

    a first timing portion for adjustably setting the off time period of the alarm driver signal; and

    a second timing portion for setting the duration of the on time of the alarm driver signal; and

    an audible alarm coupled to the second timer for providing an audible tone in response to the on time of the alarm driver signal.

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