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Thread: Opus = Best, but will ITPS suffice for low end?

  1. #11
    Raw Wave Confused's Avatar
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    Well, you've got 2 options:

    1. Hook up the Opus to the ignition, and turn the ignition on to use the computer.
    2. Hook up the Opus to a switch somewhere, so YOU can decide when you want it on This is what I do, and it works real well. If i'm just moving the car out of the drive for my mum to get her car out, the computer won't boot, or if i'm popping up the road to the shops, it won't turn on, or i can sit there while washing the car, with the computer on, without the keys in the ignition

    Also, with the Opus, you have the advantage that once the PC is on without the car running, if you DO need to start the car...the computer won't reset itself!


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  2. #12
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    Cool, i was contemplating which setup to go with.. Option 2 seems to be the best choice for me Thanks confused!

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  3. #13
    Constant Bitrate P4_2.66GHz's Avatar
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    I'd like to throw in option #3, a mix of option #1 and option #2.
    Make a switch to either send constant 12V or ACC to the Opus PS ACC input. You will need 2 diodes and a switch to do this. Diodes may be avoided if using a 2-way switch.
    This way you have an option of having your PC on regardless of ignition key input, or on/off based on it. One may even choose to go with a 3-way switch to have the ACC wire input cut completely.

    That's how mine is setup.

  4. #14
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    Quote Originally Posted by Confused
    Opus will work with the car off. ITPS + whatever won't.

    There is a 1.3V dropout on the regulator in the ITPS, so to give out 12V, you need to input at least 13.3V, which you don't get when a car is switched off.


    Garry
    the 1.3V dropout... that i hadn't read about... the ITPS wired to the ACC and 12V lines won't run w/o alternator?

    with the latter post regarding switching the ACC circuit... i was going to do this myself w/ITPS. be nice to override auto-on and keep it off for short trips. i was thinking along the lines of just throwing a simple rocker switch (similar to a fog light switch, is that a 2-way?) on there.

    but an ITPS really won't run w/car off? i figured it might not get past cranking voltage drop... but OK running off battery (usually runs about 11.5V or so don't they?)

  5. #15
    Newbie BigRedBee's Avatar
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    Groundhog Day?

    Is it just me? or do others feel like we've been down this path before.

    The ITPS will drop the input by about 1.3V. If you only feed it 12V, then it will generate 10.7V. If your setup on the other end of the ITPS can tolerate this, then YES, you can run with the car off. Mine couldn't. Either the motherboard (m10000) or the powersupply (PW70A) was shutting down as a result.

    I'm currently running with a second battery (tank) and no ITPS. I have no 12V components. I turn everything on and off via the front panel switch, and have the BIOS configured to hibernate after 30 minutes. I run the Lilliput off of the battery, using the 'egg shaped' regulator. This setup works for me, and survives a crank.

    I've also got a switch between the battery and the powersupply to remove power entirely from the whole setup.
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  6. #16
    Variable Bitrate telekineticfool's Avatar
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    Quote Originally Posted by P4_2.66GHz
    I'd like to throw in option #3, a mix of option #1 and option #2.
    Make a switch to either send constant 12V or ACC to the Opus PS ACC input. You will need 2 diodes and a switch to do this. Diodes may be avoided if using a 2-way switch.
    This way you have an option of having your PC on regardless of ignition key input, or on/off based on it. One may even choose to go with a 3-way switch to have the ACC wire input cut completely.

    That's how mine is setup.
    I agree with option three entirely. Just set up a three position switch to Off->On->ACC and you'll be Set!
    MP3 MR2 (click here for details)
    Hardware: EPIA M10000, 512Meg Ram, 5.6"TFT, Opus 150watt DC-DC PSU
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  7. #17
    Variable Bitrate Ashlawn Kemling's Avatar
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    I like the mix of the dual switch idea. I wish I could set it up though the ACC/ignition actually sent the computer in hibernate.

  8. #18
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    [QUOTE=
    The ITPS will drop the input by about 1.3V. If you only feed it 12V, then it will generate 10.7V. If your setup on the other end of the ITPS can tolerate this, then YES, you can run with the car off. Mine couldn't. Either the motherboard (m10000) or the powersupply (PW70A) was shutting down as a result.
    QUOTE]

    WTF? if the thing is gonna shut down w/o alternator, then how does it stay running to initiate shutdown sequence? eh? ie i turn off my car... ITPS initiates shutdown and stays on til off.

  9. #19
    Variable Bitrate Ashlawn Kemling's Avatar
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    The PW-70A and ITPS is so much cheaper than an OPUS... and smaller.

  10. #20
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    Yeah, but it sounds like it's cheaper because it offers you less... I'm sure the supply/demand on the OPUS helps keep it's price high too.

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