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Producing a double pulse

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=29266
Printed Date: May 16, 2025 at 7:39 PM


Topic: Producing a double pulse

Posted By: CalG
Subject: Producing a double pulse
Date Posted: March 29, 2004 at 3:33 PM

Yes,  I am new here.

I have used the search function for "double pulse" and browsed the results found there as well as much of the general information.  (Boy  there is a lot of good stuff on these pages!)  but...

I was not able to find a circut to generate a double pulse from a single pulse door unlock output from the  receiver . (APS25kb).

Can it be done with relays? or do we need something like a 556 timer IC?  

If it's been covered,  Please point me in the right direction

Thanks  CalG




Replies:

Posted By: draasch
Date Posted: March 29, 2004 at 4:05 PM
what are you looking to do with the double pulse??

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Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt




Posted By: CalG
Date Posted: March 29, 2004 at 4:29 PM

unlock the doors




Posted By: NowYaKnow
Date Posted: March 29, 2004 at 6:45 PM
https://www.designtech-intl.com/Content/techsupport/documents/section04/note231.pdf



Posted By: CalG
Date Posted: March 30, 2004 at 8:25 AM
great

So simple, it's even diagramed for the negative pulses that are used.

Thanks

CalG



Posted By: kgerry
Date Posted: March 30, 2004 at 2:24 PM

use a 452T pulse generator from DEI



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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979



Posted By: CalG
Date Posted: April 05, 2004 at 1:36 PM

I have tried to get the AS9631 unit for the APS25kb but have had no satisfaction from "Let's Go Digital" via e-commerce. ( can not give that outfit a good review.)

I will look for the Dei 452T

I tried the relay scheme this weekend on the bench.  I only had a 830 micro farad capacitor in my junk box, and did not get a true double pulse. (-)  The relay did click a bit though, so it may work.  Only a negative double pulse will work for this application (audi).

Regards

CalG


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