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

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

    my system plan so far:
    Lilliput 7" VGA TS
    VIA Epia 10000
    1x USB GPS (not for a few more months $$)
    1x internal DVD (USB if mounting goes arry)
    1x serial IR remote
    Onboard sound
    Onboard video

    I'm not going to be playing games (i doubt they run well on mini-itx anyway), maybe playing DVDs once in awhile, but mostly gonna be just using MP3 and GPS on here 99% of the time.

    so the golden question:
    Power supply.

    the opus is out of my $$ range for now. but, is a 90w/ITPS snapon combo from iTuner gonna work OK? obviously the BEST choice is the Opus, but at this point i can get the ituner setup for $75 or so vs $200.

    and... as long as i'm asking questions... how are you guys powering your LCDs? just hard wiring them into your accessory DC?

  • #2
    The ITPS + PW-70a combo http://mp3car.com/store/product_info.php?products_id=31 is okay so long as you don't need to PC while the engine isn't on or cranking.

    Comment


    • #3
      the prob with these i think is that the 12 volt feed isnt regulated so you will fry the stuff that runs of 12 volts when your car power spikes.

      some people get around this by using laptop drives that use the regulated 5 volts and they seem to survive.

      im not sure of any of this and you need to search.

      you can power lcd's of your pc power supply or from accessories.

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      • #4
        Originally posted by Bodgy
        the prob with these i think is that the 12 volt feed isnt regulated so you will fry the stuff that runs of 12 volts when your car power spikes.
        You're talking about the PW-70a by itself. The ITPS takes care of this issue and regulates the 12V line. When they are used together it's okay.

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        • #5
          Originally posted by Bodgy
          the prob with these i think is that the 12 volt feed isnt regulated so you will fry the stuff that runs of 12 volts when your car power spikes.

          some people get around this by using laptop drives that use the regulated 5 volts and they seem to survive.

          im not sure of any of this and you need to search.

          you can power lcd's of your pc power supply or from accessories.
          Nope, the ITPS will regulate the 12v line

          Edit: me too slow!
          Laidback


          The ultimate CarPC - Wow!

          Comment


          • #6
            what i've gathered is this:

            any dc-dc powersupply is gonna have to have regulation on 12V line. ITPS takes care of this. so, voltage fluctuation is not a problem.

            my concern is not not having enough power, but the (oh boy), cranking voltage drop. while most agree the OPUS will survive a crank, will the ITPS setup do so? specs say input voltage (i've read this also) 7V or so min. i suppose i will meter my car soon to find out exactly what mine does.

            but yeah,
            if the OPUS can survive crank based on what i believe to be a builtin ITPS, why not this combo?

            now... there is MUCH discrepency on this board over the crank issue. most point to either the OPUS or the tank-circuit setup.

            is there really no other way? and with regard to crank issue... is the problem that the PC momentarily starts - stops - starts again or the it starts (in IGN) and then dies (CRANKING) and won't start w/o manual restart.

            anyone? like i said, outside of OPUS this is very controversial.

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            • #7
              http://www.via.com.tw/en/VInternet/power.pdf

              EXCELLENT article i haven't seen posted yet.

              article describes a workaround for the cranking voltage dips, using a small sealed acid battery and a diode. anyone have specs for battery and diode and maybe a schematic? i did find a reference to this on here somewhere... but no conclusions...

              Comment


              • #8
                I've got a question about the OPUS and the ITPS solutions. What if you want to power your carputer when the car is off? Will it work?

                Comment


                • #9
                  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
                  Co-Developer of A.I.M.E.E
                  www.aimee.cc

                  Comment


                  • #10
                    Thanks Confused! So if I get the OPUS, then if I hit the power button on the PC, then it'll turn on. Now, what if I have it so when I turn my car on, the carputer starts. Will that mess with the computer if it's already on?

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                    • #11
                      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!


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

                      Comment


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

                        ----------------------
                        VIA Epia II
                        256MB 266DDR Ram
                        90GB Wester Digital
                        Bluetooth/Deluo GPS
                        Lilliput 7" Touchscreen
                        ----------------------
                        Mazda 6 Carputter > Click Me!

                        Comment


                        • #13
                          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.

                          Comment


                          • #14
                            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?)

                            Comment


                            • #15
                              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.
                              VIA EPIA M10000 | 7" Lilliput Touch VGA | PW70 | 256 Meg RAM | 20 Gig 2.5" drive
                              Dual Battery with Optima Yellowtop | Hellroaring Battery Isolater
                              ICOM 2720A| Delorme Earthmate GPS | Tiny Track APRS
                              Survives Crank

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