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Thread: Propably a dumb question ..

  1. #1
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    Propably a dumb question ..

    Ok, first of all, im quite n00b on electrics so i need sum help please

    In attached picture relay passes a pulse of 12v true relay right ?

    My question is can this diagram be used to press pc´s power button to
    turn it on ? Or how to modify it to use for it ?
    Attached Images Attached Images  

  2. #2
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    That looks like circuits I've seen that will do startup/shutdown for you. I'll leave it to the electrical genius' to answer but I think that's it.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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    Quote Originally Posted by Bugbyte
    That looks like circuits I've seen that will do startup/shutdown for you. I'll leave it to the electrical genius' to answer but I think that's it.
    Yup thats a momentary relay connection indeed, i just dont know how to modify it the way that it connects 2 wires, not actually give out pulse of 12v ...

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    You only need a short pulse to signal the PC to turn on. How long does that circuit stay "pressed"?
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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    Constant Bitrate strohmrs's Avatar
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    Terminals 87 & 30 should go straight to the motherboard pin headers for the power switch. They only need to be shorted together briefly. That 12V fused would probably kill your motherboard. The on time of the relay will depend upon the value of the RC network (resistor & cap).
    Rick S.

    XP Pro SP2, Soyo P4RC350 MB, Nvidia FX5200, 320W PS, Inverter & uSDC20D, 2.4GHz CeleronD320, 512MB DDR, 30GB 3.5", Pioneer 106s Slot DVD, Linksys WMP54G WiFi, Lilliput 7" & 4" TFT LCD, Zippy EL610 Keyboard, Touchpad, Garmin GPS V

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    Quote Originally Posted by Bugbyte
    You only need a short pulse to signal the PC to turn on. How long does that circuit stay "pressed"?
    This layout, ˝second which is good for this purpose

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    Quote Originally Posted by strohmrs
    Terminals 87 & 30 should go straight to the motherboard pin headers for the power switch. They only need to be shorted together briefly. That 12V fused would probably kill your motherboard. The on time of the relay will depend upon the value of the RC network (resistor & cap).
    Ok this was the information i wanted to know Thnx

    Now i just need to figure out how do i prevent it to press again if i take a leak or sumthing and shutdown engine for a while and then start it again.

    -Kungmpton

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    Depends. Does your current power supply survive cranking the car? If not, don't bother. If so, put a switch to break the signal line when you stop (that is, normally closed but you would set it to open). That would prevent the signal from being sent to the mobo.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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    Quote Originally Posted by Bugbyte
    Depends. Does your current power supply survive cranking the car? If not, don't bother. If so, put a switch to break the signal line when you stop (that is, normally closed but you would set it to open). That would prevent the signal from being sent to the mobo.
    Yeah i have tank battery stuff, no probs with cranking. How do you mean, put a switch ? A Manual switch ?

    I was thinking like i need sum sort of time based switch.

    Switch stays active after turning of car for ˝h and prevents relay system to send pulse to mobo. If line goes active inside ˝h interval, it stops counting. IE mobo stays on for ˝h after turning of car.

  10. #10
    Constant Bitrate strohmrs's Avatar
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    Now you're starting to get to the point where you might be better to just get a shutdown controller.
    Rick S.

    XP Pro SP2, Soyo P4RC350 MB, Nvidia FX5200, 320W PS, Inverter & uSDC20D, 2.4GHz CeleronD320, 512MB DDR, 30GB 3.5", Pioneer 106s Slot DVD, Linksys WMP54G WiFi, Lilliput 7" & 4" TFT LCD, Zippy EL610 Keyboard, Touchpad, Garmin GPS V

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