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Thread: startup/shutdown controller

  1. #1
    Constant Bitrate
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    startup/shutdown controller

    Ok I have done some searches and asked a few people and decide to use this

    Schematics/Pin Outs/Diagrams

    But this is using an invertor. How would I hook this up without using an invertor since my motherboard is already DC-DC and needs only 12volts to work. I am using a Xenarc SC3.

    Acutally, let my clarify. I get the first relay. 12v from battery to relay, ignition to relay, ground and 12v out to my computer instead of the invertor.

    Second relay, Serial Pin 8 to relay 30, ground to relay 85, ignition to relay 88, but where would I hook relay pin 87 to? Did I get this right?

    Thanks for any help.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    You need a DC-DC power supply.
    If you get the Opus model, you don't need the shutdown controller, since it's built into the unit. There are other DC-DC power supplies that don't have a built-in shutdown controller (like Keypower).

    Go check out the FAQ Emporium forum. It will enlighten you, I'm certain.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
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    He said his motherboard is dc ready. Only thing is you might need a 12volt regulator for the monitor but idk about the sdc. GL

  4. #4
    Constant Bitrate Willy-Mach1's Avatar
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    I'm pretty sure most (if not all) motherboards are DC, I don't think there is such thing as DC-ready MBs. Regular PC power supplies are made to take AC (your regular home outlet power) and convert it to DC (among other things like regulating, etc.) so the computer can use it. The inverter takes your car's DC power converts it to AC so you can plug in regular appliances to it. The only way to get rid of the inverter is to get a DC-DC power supply, like DarquePervert said
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  5. #5
    Constant Bitrate
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    Ok, so maybe I wasn't clear. I am using a Xenarc SC-3 which is ALREADY 12v ready. It comes with a 12v cig. lighter adapter which I would just plug in or hard wire to the 12v of my car.

    So back to the original question of the relays.

  6. #6
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    Quote Originally Posted by 65coupei6
    I get the first relay. 12v from battery to relay, ignition to relay, ground and 12v out to my computer instead of the invertor.
    Ok guys my PS is finally here. Now for the lead wires, this 12V from ignition and constant 12v can just as easily be using the stock radio harness correct? Because I want the PC to have the same power that the radio would get, i.e. coming on only when key is in ON position, and the constant 12V is what handles the shutting down properly correct? It's an M1 PS.

  7. #7
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    Ok, I will answer my own question.

    I should of thought of this earlier but I can just use a 7805 voltage regulator in between a 12v source then to the relay. That way pin 8 gets 5volts. If I could find a 2A VR then I could also use this to power a usb hub.

    Stacker: The reason the 12v on the first relay comes from the battery is that way you get a CLEAN source with 12V. The igntion part just triggers the relay to go on. If your radio does not come on with the ignition you can grab your 12volts from there and not even use a relay. But, you will also probably blow the fuse that goes to the radio. I would hook it up the way in the picture.

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