Car Alarm Arming Horn Beep Canceller

  
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Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn from sounding in the even of an actual alarm. This circuit serves to silence the arming beepyet maintain the alarm by introducing a small delay into the signal. It sits between the alarm and horn relay. The alarm must provide a constant horn signal for at least 3 seconds before the horn relay is activated. That way the quick
Car Alarm Arming Horn Beep Canceller - schematic

"beep" will never activate the horn relay, while the constant alarm signal will.



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