Trying to make the beep longer on Viper 800esp?

No ideas?

Still looking for some help..

Your cap idea could work. I'm thinking a relay cap combo. Have the siren out of the alarm drive a relay instead of the siren itself. Place a cap in parallel with the coil side of the relay. Finding the discharge time of a cap\coil combo is very easy. T=RxC    You need C=T/R T=Discharge Time to 63% of Supply (12V) R=Load Resistance (Standard Bosch Relay is 80-100ohms) C=Capacitor value in fareds Example: I want my relay coil active for approx .25seconds (T=.25) I have a bosch 100ohm coil relay (R=100) I need a capacitor size of 2500uF (.25/100=.002500) (Remember electrolytics have polarity. No backwards!!!!) This value would be a starting point. You'd have to experiment with cap values until you find an acceptible value. WHY? Relays latch up hard at 12V, but can hold to as little as 2V. Depends on size of relay. I'd start with a value of around 470uF. You can also start with a large cap (2500uF maybe?) and put resistance in parallel with it to drop discharge time to what you need (Use 200 Ohm 1Watt resistors) Don't exceed the current capacity of your alarm siren output. Recommend starting with a 470uF. Add another in parallel if not enough time. Test unhooked from alarm siren out. Manually simulate the 12V siren output by taping a wire on the cap\coil combo positive connection. Easier to figure acceptible time.. Hope this helps.... Rocket You must experiment.

Would take more then just a relay\resistor\caps. Other options: 555 Timer IC -MANY books on this. Radio Shack has a $3 book -Cap\Resistor\Transistor\Relay combo would work Recommend 555 timer reading. Interested in any ideas from others who know a simpler way to do the above mentioned timed-on relay. I know there are commercial timer relays, but they are way to expensive. Rocket