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Thread: Computer on with no key in Q's

  1. #1
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    Computer on with no key in Q's

    I have exhausted my search and am a total newbie to the carpc scene. All this talk of diodes, relays, and fuses have my head in a spin. I just have one question and that is how I am able to run my pc with no key in ignition (if possible). I have a optima yellow top bettery so battery drain isn't too much of an issue. I don't plan on leaving it on all the time so a switch would have to be put in. I have the Pw-70a + ITPS for starters and am running a 3.5" drive. Please anyone who can help me with this.

  2. #2
    Variable Bitrate RS3RS's Avatar
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    Not sure exactly how the PW-70A + ITPS works, as I use an OPUS, but I'd imagine the power supply is hard wired to the battery, and recieves 12v+ all the time, even with the ignition and computer off?

    If so, then it should be just a matter of hooking up a momentary switch to the two power-on switch pins on the motherboard to manually turn it on/off when you'd like.

    Another route would be, if you use a wire hooked up to your ACC line (or something like that, a power source that only supplys 12V+ when the ignition is on), is to wire a switch to that ACC line that goes to your computer, that would give it 12v+ whenever you flip the switch, even when the ignition is off. Sorry if that doesn't make sense, I don't really know how to explain what I mean. Perhaps someone else can make sense of my gibberish.

    (Yes, I'm in terrible need of sleep. )

    Good luck

  3. #3
    Nic
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    just wire up the cable that goes to your itps (the ignition one) to go through a switch so that u can connect it to ignition, or constant power (i got a 3 way switch so i have ign, constant power or off)
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  4. #4
    Constant Bitrate mikevsgeek's Avatar
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    this is how i solved that problem: since the powersupply doesnt draw much power from teh ACC line, I took the ACC line and the Batt line from the radio harness to a SPDT switch which outputs to the ACC terminal on my Opus. the SPDT switch allows you to switch between using the ACC line and the Battery line as the "ACC" line.. works great for me

    i'll attach a simple diagram for ya!
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  5. #5
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    hard wire direct to the battery
    been doing that for years with my car stereo
    dont forget to turn it off at the end of the day

  6. #6
    Constant Bitrate mikevsgeek's Avatar
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    Quote Originally Posted by fordman
    hard wire direct to the battery
    been doing that for years with my car stereo
    dont forget to turn it off at the end of the day

    I know the opus requires being directly connected to the battery, but it also requires another 12v feed to sense when the car is on and off, so it turns on and off with the car...

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