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  • timed relay?

    im after a relay that when triggered with a quick pulse will stay connected for about 2 mins then shut off..
    something like a turbo timer but with out the price?
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  • #2
    Originally posted by djmickyg
    im after a relay that when triggered with a quick pulse will stay connected for about 2 mins then shut off..
    something like a turbo timer but with out the price?
    Someone posted a link to those relays once. They were pretty damn expensive!
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    • #3
      yeah ive had a search around here and only found them..
      there is gota be an easy way to build one..
      i was gona search the net some more but i figured someone here might know

      there is a cheap turbo timber on ebay au for au$30 which would do what i want..
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      • #4
        If you're into DIY projects and know how to use a soldering iron, use the 555 IC chip.
        Run a Google search on Time Delay 555 and see the examples. To make it do the work for you, use a proper relay on the other end (insead of LEDs as they appear in many examples). You will be able to set the time correctly (up to 10 mins) by getting the correct amount of resistance and capacity (you'll see those in the various examples).
        Good luck.
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        • #5
          I bought a DEI 528T pulse timer relay on ebay for $25. Retail is $49. There's some on ebay right now for less than $20 shipped, can't beat that IMO.

          They work great too. But the details on those auctions are incorrect, it's max 15 amps. Any more and you need to use it with a seperate relay.
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          • #6
            http://www.hometech.com/brains/timers.html

            scroll down to the ELK-960

            I use that right now, after ~60 seconds (which you can change from a few seconds up to 60 minutes, I just happen to use 60 seconds), it cuts off the relay so when I hit the switch to shut off my opus, if a software lockup occurs, I can walk away and not worry about my battery being drained (which happened to me before I bought this timer).

            The timer is VERY programmable, you can set it to start counting when you switch the input high, switch it low, cut off the input, all that jazz. I think it can repeat, a bunch of other stuff.

            I forget where I bought it, was too long ago. The link I gave above is around $21 (before s/h), and that's right around what I paid. May be able to find it for cheaper, I dunno.

            Nice product too. Relay can't handle a LOT of current though. I intentionally just bought a 30 AMP relay as well for a couple of bucks. That way this fancy relay just controls the 30 AMP relay. Has worked beautifully for me thus far.

            Good luck

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            • #7
              http://www.elkproducts.com/products/elk-960.htm

              there's the product page direct from the manufacturer

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              • #8
                you can look into the pac tr-7.. it has a lot of features & can do what you are looking for too
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                • #9
                  This is what I got from a friend of mine when ask him for a timer relay for a little project that I have in mind


                  It work for 0-15 min.

                  Thanatos.
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                  • #10
                    He said >>>

                    Originally posted by djmickyg
                    something like a turbo timer but with out the price?
                    People dont read anymore

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                    • #11
                      Originally posted by DJiK
                      If you're into DIY projects and know how to use a soldering iron, use the 555 IC chip.
                      Run a Google search on Time Delay 555 and see the examples. To make it do the work for you, use a proper relay on the other end (insead of LEDs as they appear in many examples). You will be able to set the time correctly (up to 10 mins) by getting the correct amount of resistance and capacity (you'll see those in the various examples).
                      Good luck.
                      Thats right, problem with 555 monostable is that they are negative going pulse triggered. This can be converted to positive pulse trigger by using a transistor, inverter or even just another relay.

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                      • #12
                        I used around 5000uF worth of capacitors and a Bosch relay. At 12v, it holds the relay charged for about 1-1/2 minutes. The one catch is that you need to hold the switch long enough for the caps to charge - shouldn't take more than a second or two.

                        Not as exact as a timer, but if you're okay with a few seconds of variability, this is a simple and cheap way of doing it.
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                        • #13
                          I have two DEI 528T, and love them. I didnt pay anywhere near 20 bucks for them. shop around, youll find em cheap.

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                          • #14
                            thanks everyone for the links and info
                            im looking into it now..

                            ive used 555 times b4 so i might have a crack at them first b4 buying anything
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                            • #15
                              Think so Whiteabbit? Post a link.

                              They're $9 on ebay, plus another $9 shipping for the first one. Buy three or four and the cost per timer goes down substantially. But if you only need one. . .
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