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Thread: ITPS Qs

  1. #1
    Constant Bitrate
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    ITPS Qs

    ok ive decided to go with a DC DC PSU.
    however after reading many threads i dont understand how the ITPS uses the Ignition wire.

    i heard that you can use the cig lighter wire as a ignition wire.
    my cig lighter in 01 civic only turns on when the key is in ACC or On position.

    so do i just hook up the +12v from the cig lighter to the ITPS and a +12v from the battery to the itps and it will work?

    the Ignition wire is only supplying power to let the itps to shutdown and turn on right? not acutally powering the unit? the constant from the battery will be doing this right?

    thanks!! i love this forum!!

  2. #2
    Raw Wave Confused's Avatar
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    I have a question for you.

    Do you think you will ever:
    1) Want to use the PC with the engine not running
    2) Have the PC running when you start the car (cranking)?

    If your answer to either of those is "Maybe" or "Yes", then please, save your money, and don't get the ITPS. It can't survive the crank, and more than likely won't power your PC with the engine off.


    Now, onto your question, which relates to the Opus, Carnetix, and the ITPS.

    You have 3 wires, one direct to the battery (with a fuse close to the battery!), one direct to "ground", which is basically the nearest bit of your car chassis to the power supply, and a switched 12V. I can't recommend you hook it up to your cigarette lighter, however, do it properly and connect it directly to the ignition, which will probably be a yellow wire under the dash, or there will be a wire which does the same job to turn your stereo on/off


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  3. #3
    Constant Bitrate
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    sorry for not being detailed.
    I plan on building a tank circuit with a second battery to survive cranks.
    is there anyway to trick the ITPS.
    like have a 12v source but i put a switch in between the ITPS and the source and just turn it on off to emulate ignition and keyposition?

    so i'll have Two 12v sources. one will have a switch in it and the other wont.

    im more interested in the regulating portion of the itps than the shutdown controller. that is the main reason why i bought it.

  4. #4
    Raw Wave Confused's Avatar
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    Even with a second battery, unless it is providing at least 13.3V in, you won't get 12V out. Most car batteries when not being charged by the alternator will give out about 12.4V, which isn't enough to allow the ITPS to power up the PC.

    You can put a switch in the remote lead, I am doing it with the Opus in my car, so I can control when it comes on/off, rather than going on/off with the ignition.

    However, I must warn you that you will probably be disappointed in the ITPS for it's regulation, the startup/shutdown controller is the only decent part on it.


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  5. #5
    Constant Bitrate
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    so should i just run the DC psu directly?
    i shouldnt have any problems with voltage changes with the PW70?

  6. #6
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    Well.. That's not always true there Confused.. I have an ITPS and PW-70A PSU on an Epia M10000, and I can power the PC up without the engine running. What I can't do is power the HD as I'm only giving it about 11.5 volts. If one was using a laptop HD and no other 12v devices, then it wouldn't be much of a problem.

    However, it won't let you keep the PC in standby (only the Opus can right now that I know of), so you have the added delay of startup/shutdown/hibernation to think about too.

  7. #7
    Variable Bitrate brooksware2000's Avatar
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    Quote Originally Posted by dannn
    sorry for not being detailed.
    I plan on building a tank circuit with a second battery to survive cranks.
    is there anyway to trick the ITPS.
    like have a 12v source but i put a switch in between the ITPS and the source and just turn it on off to emulate ignition and keyposition?

    so i'll have Two 12v sources. one will have a switch in it and the other wont.

    im more interested in the regulating portion of the itps than the shutdown controller. that is the main reason why i bought it.
    Are any of the circuits listed below what you looking for?
    Attached Images Attached Images   
    Check out my hopefully useful site...

    www.hobbybotics.com

    It's still under design but it is functional

  8. #8
    Raw Wave Confused's Avatar
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    Yang is true that you won't be able to run a 3.5" hdd, or any other 12V components. However, it's best to not run the risk of putting less 12V power into the PC.

    No offence meant, dann, but you really should have done the research/asking questions before you purchased the components, as I wish I had done, I went through most of the other options before getting my Opus (although if the Carnetix product had been out 6 months ago I would have jumped on that)


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  9. #9
    Constant Bitrate
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    is the reason why it requires the engine running is cuz the regulator needs 13.3v?

    so can i just use the PSU directly off 12v from the battery?

  10. #10
    Raw Wave Confused's Avatar
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    Yes, the regulator requires at least 13.3V in to provide 12V out.

    If you can guarantee that the battery will give out a constant 12V, then yes, go ahead and use the PSU connected directly to the battery. However, no car battery will give out exactly 12V, as I said earlier, it will give out about 12.4V with the engine off, and abotu 14.4V with the engine on and the battery being charged by the alternator.


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

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