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| Author | Views | Views Today | Rank | Comments |
| bob | 11,698 | 1 | |
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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 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. |
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| i am a beginner, i dont know where to supply power and the right voltage to make it work. | ||
| Fran, all you have to do is google 555 timer datasheet and you will find a formula to calculate the correct resistors & capacitors to use... | ||
| can i make it more then 3 sec? i nede it about 4 min can you help me maybe by changing some parts | ||
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