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Double pulse unlock

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=30016
Printed Date: July 18, 2025 at 8:20 PM


Topic: Double pulse unlock

Posted By: dizturbd2
Subject: Double pulse unlock
Date Posted: April 08, 2004 at 9:41 PM

I am trying to figure out a way to make a single pulse unlock into a double pulse unlock using relays and maybe diodes, but no capacitors. 



Replies:

Posted By: CalG
Date Posted: April 14, 2004 at 12:46 PM

There is a reply to this on the security forum from about 2-3 weeks ago.

A capacitor in series with the NC common and the relay coil  does the trick.

I get the timing I want with a 2400 mfd cap.

https://www.designtech-intl.com/Content/techsupport/documents/section04/note231.pdf

Check this link.

Regards

CalG




Posted By: Teamrf
Date Posted: April 14, 2004 at 2:36 PM
On the DEI alarms they have a program feature that you can change this too.

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Posted By: CalG
Date Posted: April 14, 2004 at 3:39 PM

I bet this can be done with two relays as well.

The second relay wired to system voltage makes use of the NO function and injects a + signal while the - signal is in process.

By the time the things repeat, the activation signal is over.

I would need to play around at the bench.

Think about it.

CalG 




Posted By: CalG
Date Posted: April 14, 2004 at 3:52 PM

First pass says that if the second relay has it's coil energized thru a  suitable resister, it can be made to drop out as soon as the NC contact makes connection.

Too bad I don't know how to post a relay diagram here.

For those who would just advise to buy the accessory double pulse device,  Sometimes it is more fun to know than to have.

Regards

CalG




Posted By: CalG
Date Posted: April 15, 2004 at 4:20 PM

Tried to get this to work last night, but could only manage a buzz.

Capacitance can be a beautiful thing.

CalG




Posted By: the12volt
Date Posted: June 17, 2018 at 7:59 AM
https://www.the12volt.com/doorlocks/special-car-door-lock-systems.asp

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