time delay relay
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=113941
Printed Date: May 17, 2024 at 10:19 PM
Topic: time delay relay
Posted By: dis0nnected
Subject: time delay relay
Date Posted: May 21, 2009 at 8:25 AM
I'm trying to use my remote lead to make a 4-6 second time delay relay that will apply ground to a wire 4-6 seconds after the receiver is powered on. Any ideas? I was thinking I could use a modified version of the "Pulsed to Steady Output" of the Special Application page, using the capacitors to create the delay, but i'm not very familiar with capacitors.
Replies:
Posted By: ckeeler
Date Posted: May 21, 2009 at 11:43 AM
you could use a DEI 528T.
Posted By: howie ll
Date Posted: May 21, 2009 at 3:43 PM
Using a 528t would be much simpler, cost you less time and safer if you are not happy with caps, also power handles more than 20amps.
Posted By: dis0nnected
Date Posted: May 21, 2009 at 4:44 PM
I'd really rather use capacitors if possible, I'm trying to learn. I have a couple of ideas i'm going to test tonite. Thanx
Posted By: dualsport
Date Posted: May 23, 2009 at 1:41 PM
Simple as can be- just use a transistor driver for a relay, and on the input, have a diode pointing towards the input side, with a resistor in parallel across it.
From that, connect a capacitor to ground, and use that as the input to the transistor driver.
The way it works is that when your input goes high, it starts charging the cap through the resistor, and when it charges up enough, the relay turns on. Just select a larger cap and resistor to get a longer delay time.
When you shut down, the diode allows the relay to turn off immediately by bypassing the resistor.
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