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Thread: Please help with designing a 12v 10 minute Off-Delay timer

  1. #1
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    Please help with designing a 12v 10 minute Off-Delay timer

    Hi folks.

    I'm new to this whole forum posting lark so please be gentle with me

    My issue doesn't directly relate to an automotive mod, but I have no doubt that it could certainly have applications within this field. Also from reading a ton of different posts within these forums, I reckon that you clever guys here are much more likely to be able to help me solve this.

    Project brief:

    To create an off-delay circuit for an external cooling solution for an Xbox 360 games console.

    Basically, I have an Xbox 360 console which used to have a problem with the 3RLOD, I decided to remove the stock heatsinks and install a Koolance external water cooling system. This has remedied the fault with the console superbly (the console now operates at a max. load temp. of 43 deg. C.) and the 3RLOD hasn't returned in over 6 months of use since the mod was completed.

    The issue which I have however, is that the external cooling solution must first be powered on from it's own seperate 12vdc power supply before the console can be powered on, aswell as having to remember to also switch off the cooling solution once I have had enough of getting my butt kicked at Halo3 by some grotty little 5yr old. I am concerned that either I might forget to do this one day or somebody else will come along and have a play but forget to turn on the cooler, which will most certainly lead to my Xbox 360 burning out.

    I would like to create a circuit whereby upon powering on the Xbox 360, an off-delay timer circuit of some sort, fed from the Xbox 360's internal 12v supply, switches & holds on the seperate 12v supply to the cooler using a latching relay, then upon powering down the Xbox 360, the circuit will hold in the seperate 12v supply to the cooler for an additional 10 mins or so to allow it time to dissipate any residual heat from the system. I have read in places about using a 555 timer but i'm unsure exactly how to accomplish this.

    Although the Xbox also operates using 12vdc which can be used to power the circuit, the seperate 12v supply must feed the cooler. I wouldn't like to run the risk of overloading the Xbox 360's PSU.

    I would be very appreciative of any help that you guys could offer.

    Thanks, WinMXer.

  2. #2
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    You need a delay timer kit that drives a relay. Here's link to get you started, not sure if it does precisely what you want, but it has similar functionality: http://www.apogeekits.com/start_stop_timer_k2579.htm

    I think that if you use a relay connected to the input power of your XBOX, you can turn the circuit on without problem. When the power goes off, the timer circuit holds the relay closed for 10 minutes, then shuts it off.
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  3. #3
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    Hi BugByte.

    Thank you very much for your response. It just so happens that I bought that exact same Velleman kit yesterday from Maplin's thinking that it was exactly what I needed, only to realise that it wasn't quite, although i'm sure that with a bit of tweaking it could work as intended.

    From building it & testing it, I found that this circuit operates more like an egg timer. By activating the momentary start button the relay latches & the timer initiates for the set period. When this period expires, the relay drops out. I don't know how to modify this for my needs though, as my electronic skills certainly aren't what they used to be.

    I need the 12v from the Xbox 360 to activate & latch the relay, then upon loss of the Xbox 360's 12v the relay must hold for an additional 10 mins.

    Is there a way that I could butcher this kit to make the circuit I need? Here's a scan of the circuit diagram included with it, maybe it'll help.



    I've aleady tried just bridging the start button connection thinking that this will keep the circuit active until power is removed, but this just pulls & releases the relay as soon as power is applied. I'm stuck on this one & think I need to look at maybe designing the circuit from scratch rather than confusing myself trying to modify the kit's circuit. ...with help from you guys of course PLEASE

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