Time Delays

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=77885
Printed Date: May 09, 2024 at 1:57 AM

Topic: Time Delays

Posted By: Overcranked23
Subject: Time Delays
Date Posted: May 16, 2006 at 3:58 PM

I am wondering how you could set up a circuit to time delay. What I want to do is have aset of lights (led in the head lights that run on B+ (while the truck is running but I want them to stay on a while after I shut the vechile down. Any Ideas. I know that they make time delay realays but I have not found any that fit my application. I would like some choices here so the more ideas you have the better off I would be. adjustable time frames would be nice too

-------------
don't fowl the track

Replies:

Posted By: hotwaterwizard
Date Posted: May 16, 2006 at 8:20 PM

how long do you want them to stay on?

12v LED's or standard 2 volt

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: Overcranked23
Date Posted: May 17, 2006 at 3:02 PM

adjustable would be nice a couple minutes max I guess. I not sure what you mean by voltage I thiught that standard voltage was around 3.3

-------------
don't fowl the track

Posted By: hotwaterwizard
Date Posted: May 17, 2006 at 10:39 PM

OKAY

How about this?

You could substitute a 1 meg pot for R

posted_image

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: May 17, 2006 at 10:47 PM

Oh yea here is the pinout for the LM555 Timer IC

posted_image

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: ghost ryder
Date Posted: May 18, 2006 at 8:43 AM

A Dei 528t relay maybe what you're looking for

Posted By: Overcranked23
Date Posted: May 18, 2006 at 2:49 PM

I like the Idea of the premade relay anyone have any experience with that relay and could tell me how that they would set this up. I want the lights to be on all the time with ign and when the Ign is turned off I want the lights to stay on for 60-90 seconds.

-------------
don't fowl the track

Posted By: hotwaterwizard
Date Posted: May 18, 2006 at 10:05 PM

posted_image This Timer is 0 to 90 seconds. What happened to 4 or 5 min?

https://www.drdetailshop.com/528T.htm

528T Pulse Timer Relay

This special accessory is an adjustable timer with a built-in 30A relay. The "pulse" timer can be triggered by a + or - pulse or a change of state (from + to - or vice-versa) on the stripe wire.

This product has many popular uses by installers of mobile electronics, some examples: what do you do with a multi-channel remote when the customer has one car and no truck release? Add a pulse timer relay.

If you need to disconnect a circuit for a certain amount of time, so that the alarm does not activate, you can use the pulse-timer's normally closed circuit, pulse the stripe wire to disconnect the circuit for up to 90 seconds.

Adjustable timer from 0 - 90 seconds.

posted_image

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: May 18, 2006 at 10:08 PM

Guess what?

It looks like it uses the same circuit I gave you with the 555 timer.

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: Overcranked23
Date Posted: May 19, 2006 at 2:50 PM

Ok Now I have never tried this kind of setup before so mabye you could give me a little detail about the whole pulse what ecactaly does that consist of? what do I use for a pulse

-------------
don't fowl the track

Posted By: hotwaterwizard
Date Posted: May 19, 2006 at 8:47 PM

Constant to Momentary Output
The capacitor allows the coil of the relay to be energized until the capacitor stores a charge, thus de-energizing the coil. The resistor bleeds off the charge of the capacitor when positive voltage is removed from the other side of the coil. You can increase the output time by simply changing the value of the capacitor. This one will give you about a 1/2 second output.

posted_image

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: gamfreak
Date Posted: June 02, 2006 at 11:54 PM

this circuit is for momentary current to make it into a constant current