how to get single tone siren?

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=2634
Printed Date: September 11, 2025 at 12:19 AM

Topic: how to get single tone siren?

Posted By: 2000vsm
Subject: how to get single tone siren?
Date Posted: August 08, 2002 at 10:30 PM

ok i opened up one of my sirens and there is this IC and some basic resistor, diodes, caps

there is also these 4 larger transistors in a row... i assume they power the different tones? i want it to become only a single tone.. no stupid 5-tone crap.. anyway of doing this or i need to buy some siren?

Replies:

Posted By: Velocity Motors
Date Posted: August 09, 2002 at 5:20 AM

Most of the newer systems use the CPU to output the siren tone and the siren itself is only the sound producer. To test this out hard wire the siren to a battery and if the siren outputs a constant tone then you have to modify the alarm CPU.

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: 2000vsm
Date Posted: August 09, 2002 at 7:44 AM

nope it's the siren! so how do i do this.. do i just kill the transistors?

Posted By: mobiletoys2002
Date Posted: August 09, 2002 at 8:57 AM

do you have a dei siren? if so there is 6 small silver leads on the board any of these can be cut to delete each of the sounds 1 through 6.

Posted By: the12volt
Date Posted: August 09, 2002 at 9:33 AM

Hi 2000svm, the image below shows the 6 traces on the board of a 6 tone siren. To eliminate any tone you do not want, simply cut the trace, but do not cut the trace for the standard siren or you may eliminate the arm/disarm chirps.

posted_image

the12volt

Posted By: cpgoose
Date Posted: August 09, 2002 at 9:56 AM

So if you delete sound #3, it will go from #1 to #2 to #4 to #5 to #6 and then repeat?

Just wondering because I heard you can "customize" your alarm by deleting sounds. But it's not really making anything sound different, it's just deleteing sounds.

Posted By: mobiletoys2002
Date Posted: August 09, 2002 at 9:59 AM

one thing to also say to add to the volt if your siren is indeed a DEI brand any of the six can be cut without deleting the arm/disarm chirps. And also if this is a DEI siren the numbers are opposite of that of the volts diagram so the first sound will start at the right and go to the left . good luck