timed power cut off relay. help

Discussion in 'The Projects Forum' started by ameripip3, Mar 11, 2015.

  1. ameripip3

    Thread Starter New Member

    Mar 11, 2015
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    Ok, we have a 110 bell at work with a button to ring it on the front counter. As long as you are pushing it, it rings loud. As you can imagine some people think it's fun to piss you of and keep ringing it. I want to make it where you can only ring it for a moment then have to wait roughly 2 minutes until it will let you ring it again.

    I'm thinking a momentary push button for the first burst then a timed relay of some sort. Can someone help me out please?
     
  2. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    Many ways to skin this cat.

    I have presented the insides of a timer that refuses to let the bell restart for 2 minutes to 5 minutes, but it doesn't limit the first ring and it's designed for 24 VAC. Some of them are designed for 120 VAC. The point is, these things are available as a finished product in your local air conditioning wholesale store.

    Another way is to use an LM555 timer with a lockout circuit during the second part of the timing period. This would involve building a DC power supply.

    Are you looking to assemble something or buy something?
    How good are you at analog design?
     
  3. ameripip3

    Thread Starter New Member

    Mar 11, 2015
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    It would be cool to build something for the experience but not needed. If I can buy something for cheap enough the awesome. Just give me a part number if you want, haha. Some days I'm ready to just cut the wires so they can't ring it anymore. Thanks for the reply btw.
     
  4. ameripip3

    Thread Starter New Member

    Mar 11, 2015
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    Oh and I'm not very familiar with schematics so that drawing doesn't make any sense to me. Basically you would have to tell me what parts to buy and what order to wire/solder. Thanks
     
  5. #12

    Expert

    Nov 30, 2010
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  6. ameripip3

    Thread Starter New Member

    Mar 11, 2015
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    Thanks, I was acutely looking at that same part earlier, just didn't know if i needed delay on or off.

    Ok, would a momentary button in front of a delay on relay simular to that switch do the same thing but with a limited first ring?
     
  7. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    You can use a 555 timer with a one shot pulse , this will ring the bell for say 1 to 2 seconds, then lock out for 5 seconds, even if the push button is held down it will only work once , until the push button is released for 5 seconds.



    555.png 555.png
     
    Last edited: Mar 12, 2015
  8. Reloadron

    Active Member

    Jan 15, 2015
    963
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    I don't think what you want here is a delay on or delay off. What I believe you want is a pair of One Shot Relay Timers. The button is pressed and both timers start a timing cycle. The button is wired through the normally closed contacts of Timer 2. Timer 1 closes its normally open contacts powering the bell for a short duration that you set. Pressing the button repeatedly won't do anything until timer 2 times out preventing timer 1 from doing anything. Make for example Timer 1 a three second ring and Timer 2 set for your 1 or 2 min. Essentially Timer 2 locks out the bell and prevents retriggering of Timer 1 till it times out.

    What's the difference between On Delay, Off Delay, Single Shot, Interval On and all these other time delay functions? The link is a good read on the subject. Anyway, my thinking for your application is a pair of "One Shot" relay timers having a SPDT (Single Pole Double Throw) relay output that you configure and timing that you configure. You only need to add a simple pot (resistor) to these things and connecting them is easily done.

    Ron
     
  9. ameripip3

    Thread Starter New Member

    Mar 11, 2015
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    Thanks guys, I will let you know what i end up with and how it works.
     
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