time delay relay

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dis0nnected

Member - Posts: 7

Joined: May 21, 2009

Location: Georgia, United States

Posted: May 21, 2009 at 8:25 AM / IP Logged

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.

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ckeeler

Gold - Posts: 1,461

Joined: June 20, 2008

Location: New Mexico, United States

Posted: May 21, 2009 at 11:43 AM / IP Logged

you could use a DEI 528T.

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howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: May 21, 2009 at 3:43 PM / IP Logged

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.

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dis0nnected

Member - Posts: 7

Joined: May 21, 2009

Location: Georgia, United States

Posted: May 21, 2009 at 4:44 PM / IP Logged

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

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: May 23, 2009 at 1:41 PM / IP Logged

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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time delay relay

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