extend duration of a short signal

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=2319
Printed Date: May 18, 2024 at 11:16 PM

Topic: extend duration of a short signal

Posted By: mr_timluu
Subject: extend duration of a short signal
Date Posted: July 28, 2002 at 11:38 PM

i have a question about this....if my alarm has a 1/2 second pulse and i would like to extend this time with a relay and a capacitor with a resistor...what capacitor would i buy and resister....i want to use this for the sunroof which is a neg(-) pulse, what i would need is 4 seconds and to roll my windows that is also a negative pulse with only 1/2 available from my alarm to 5 seconds or more....i also really want to extend a positive pulse that is 1/2sec to a full second. this will solve all my dilemma's of my car...thank you to all who have any info

Replies:

Posted By: Velocity Motors
Date Posted: July 29, 2002 at 8:17 AM

You will have to play with different capacitors and resistors. Only you will be able to know after you hooked everything up wether or not the capacitance is enough or too much. Start out with a 25 - 30 k uf capacitor and see how long of the duration you have and go from here up or down.

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

Posted By: mr_timluu
Date Posted: July 30, 2002 at 1:19 AM

am i suppose to ground the capacitor....in the diagram...thats what it looks like

Posted By: Velocity Motors
Date Posted: July 30, 2002 at 1:28 AM

Yup posted_image

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