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  • DC-DC device ?

    Planning to make my carputer one day... I was thinking about a powersupply...
    when I found a little device (normally used for carkits or something like that)

    The Details:

    Overvoltage Protection
    Input:12/24 VDC
    Output: 12VDC

    12/24 Max: 5amp continu
    24/12 Max: 5amp 1 min.


    Is this something I can use for a stable 12volt source in my car ?

  • #2
    nope

    Comment


    • #3
      It will only work for regulating your 12v line. Your power supply must provide other voltegas aswel.

      What this will enable you to do (if it is cheap) is to connect a cheap PSU (the cheap ones don't regulate the 12v rail) and have it work fine without damaging any 12v devices.

      I don't know if the amps are enough though
      -Jesus- King of Kings Lord of Lords

      Comment


      • #4
        What kind of mobo are u planning to get?
        EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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        • #5
          I'm planning to build just a simple carputer for mp3 use. Like an ALCAS system.
          I have some old AT and ATX mobo's I can use.

          Comment


          • #6
            Planning for carputer needs to include doing a little math on the power consumption side of it. Gather all the components you plan on using in the system. Calculate the power consumptions, then you make a decision about the power supply. http://www.mini-box.com has a little power calculator that you can kinda use for your calculation. They also have a quite comprehensive paper on carputer's power requirements.
            EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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            • #7
              I checked the link, but its for new hardware only , no old AT based mobo's there

              I checked the dude from ALCAS his powersupply
              +5V / 5A -5V/0.2A (Step-down)
              +12V / 2A -12V 0.2A (Step-up and Step-down)


              So correct me if I'm wrong:

              If I use one of my devices for the 12V line (5A continu), that would be enough I suppose.
              Than If I use another device (the same 12V thing) , and build a voltage divider with some resistors to get the 5V line.
              Would that be ok already ?
              (off cource nevermind the negative lines for now...)

              Comment


              • #8
                I was aware that the link didn't have any info for AT mobo. I mentioned about the calculator so you could calculate the loads (devices) you'd be putting on the power supply.

                Anyway, so you're planning to use that power supply to power only your devices, then? Not mobo + devices?

                If only for the devices and you have done your math right then it should b ok.
                EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

                Comment


                • #9
                  And u think I have to low power for using it for my mobo ?

                  The ALCAS dude, had enough I suppose

                  Comment


                  • #10
                    Do you have a link to this 12v supply?

                    Comment


                    • #11
                      I think I finally found out what you meant with this alcas stuff. Is this it: http://schapenstal.homeip.net/alcas/...tional%20cards ?

                      Although it looks like he uses the PS to power everything (MB & devices), I'm not very certain. Email him & ask about it.

                      It seems to be a pretty good PS if it really does what he says it can do. Find postings of people that have built that PS. Email them and ask for opinions if necessary.
                      EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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                      • #12
                        hcker2000 > no I don't have a link

                        edikp > sorry, I thought that ALCAS was better known sorry for my unclearness.
                        Any idea on how I can get the negative lines ? (-5 and -12V )
                        Or do I just have to switch the polarization ?

                        Comment


                        • #13
                          Originally posted by headtrip
                          edikp > sorry, I thought that ALCAS was better known sorry for my unclearness.
                          Any idea on how I can get the negative lines ? (-5 and -12V )
                          Or do I just have to switch the polarization ?
                          Well, the fact that I didn't know about it doesn't make ALCAS not popular. No apology accepted.

                          I don't really understand your question. Negative lines? If you were asking about how would bring power to motherboard then get an ATX power extension cable (look @ attached image). Providing u hv a mobo with ATX power connection, of course.
                          Attached Files
                          EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

                          Comment


                          • #14
                            No

                            An AT connector has pins with:

                            +12 volt
                            +5 volt
                            -5 volt
                            -12 volt

                            my question was, how to get those negative voltages. Can I just reverse the polarization ?

                            Comment


                            • #15
                              How would you reverse it? The negative voltages need to be generated. Folks kinda talked about it here: http://www.mp3car.com/vbulletin/show...gative+voltage

                              Btw, are you just trying to save money on power supply by using an alternative? Rather than worrying for alternatives, buy an already built one. Mini-box.com has several that are relatively cheap (about $35). Or browse the For Sale section of this forum. Or eBay. Or..?
                              EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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