car alarm arming horn beep

Posted on Feb 6, 2014

It`s a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed. 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 beep

car alarm arming horn beep
Click here to download the full size of the above Circuit.

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

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Crystal Radio
    Cosmic Ray Detector using Fluorescent Tubes
    the modern firepower pinball project
    rem bell circuit
    radio mf tx
    USB Host and Device
    A New Solar / Wind Charge Controller Based on the 555 Chip
    Simple AC short circuit protection