Time Delay Shutoff Relay

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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=33337
Printed Date: August 25, 2025 at 12:12 PM

Topic: Time Delay Shutoff Relay

Posted By: vcbb5
Subject: Time Delay Shutoff Relay
Date Posted: June 05, 2004 at 1:01 AM

First off, im an electronics noob, so be nice :).

I'm trying to make a relay that shuts down the circuit about a minute after the ignition switch it turned off. I was thinking about using capacitors to delay the shutoff, but idk if that will work.

I'm setting up a computer in a car, and want time for the computer to shutdown after the ignition is turned off. I have a SPST relay attached to the power switch of an inverter that closes the switch when the ignition is on. My relay is a SPST 1 amp.

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Replies:

Posted By: xetmes
Date Posted: June 05, 2004 at 9:16 AM

a minute is a long time for capacitor delays, you will probably want something solid state.

Posted By: vcbb5
Date Posted: June 05, 2004 at 9:27 AM

I've had suggestions of a "555 Timer" and transistor thing? Here are links to similer setups:

https://www.astron.nl/~smirnov/poweroff.html

https://www.kpsec.freeuk.com/projects/timer.htm

Posted By: noeljimmy
Date Posted: June 17, 2004 at 11:15 AM

think about turbo timer relay?

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