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DEI 528t, Siren Delay

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Member - Posts: 10
Member spacespace
Joined: July 29, 2004
Location: United States
Posted: November 24, 2009 at 6:18 AM / IP Logged  
This is a circuit I'm using in my truck that's triggered by the siren output of the alarm.  It delays output to additional alarm lights and sirens.  Right  now I have two Aux relays that control two circuits that are isolated from each other.  One for LED's and one for an additional siren.  These lights and siren needed to be isolated because they are also switched on manually and cannot be allowed to backfeed into each other.  I originally tried it without the 'Delay' relay, but found that the 528T was pulling the Normally closed circuit open at the same time that the Aux relay was closing, resulting in a very brief flicker of the LED's.  With the additional relay inserted, the flicker is eliminated.
Arming and disarming chirps only use the car alarm siren.
During full alarm, and after a two second delay, LED's and secondary siren are activated.
I hope somebody will find it useful.
DEI 528t, Siren Delay -- posted image.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: November 24, 2009 at 6:50 AM / IP Logged  
Nice one, but I wonder if you could have used diodes to save some of those relays, sorry I can't get my head round it to explain.
Gold - Posts: 2,015
Gold spacespace
Joined: October 20, 2002
Location: Texas, United States
Posted: December 04, 2009 at 8:29 AM / IP Logged  
On toyota, honda, lexus, ect... w/ factory soft chirp, can this be utilize to prioritize the soft chirp to chirp when you lock/unlock before the siren?
another word, I like to keep the soft chirp that the OEM vehicles have for when you lock/unlock but at the same time still retain the viper siren when the alarm goes off.
"The two most common elements in the universe are H+ and stupidity" (Ellison).

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