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Powering everything from M2-ATX? (Wiring diagram included)

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  • Powering everything from M2-ATX? (Wiring diagram included)

    Does everyone use their PSU to power all the components of their CarPC?

    This is a quickly drawn up wiring diagram of how I'm planning to wire mine. Does it look about right? I'm not sure whether the external enclosure requires 12V or 5V, as I haven't bought one yet.

    2004 Mazda3 Carputer Worklog - Update 5/17/11: Carputer 2.0 Hardware Selection

  • #2
    Personally I wouldn't use the chassis grounds, use the grounds on the molex instead.
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    • #3
      I agree ^^^ Use the Molex's grounds. The M2 should be connected to chassis ground and all ground from each component should connect to there through your splitter.

      Make sure to get the correct gauge wire for the M2's connections to 12V and GND.
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      • #4
        is there a reason to use the molex grounds instead of chassis ground? I was going to use chassis ground so I would have to run one less wire to the component I'm powering. Not a big deal. Is the molex ground somehow a more stable ground point than chassis?
        2004 Mazda3 Carputer Worklog - Update 5/17/11: Carputer 2.0 Hardware Selection

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        • #5
          Maybe it's just me, but I don't think I'd run all of that off a single M2...
          Why not just 1 or 2 Bosch style relays switched on from the M2 to power all the accessories?

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          • #6
            id do some seperate power supply for at least the external drive and lillyput or teh lillyput and usb hub, or usb hub and external, id remove two of the components from the M2
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            • #7
              Originally posted by Stealth915 View Post
              Does everyone use their PSU to power all the components of their CarPC?

              This is a quickly drawn up wiring diagram of how I'm planning to wire mine. Does it look about right? I'm not sure whether the external enclosure requires 12V or 5V, as I haven't bought one yet.

              I have an Opus 320 and run everything off of it without any problems...very reliable.
              "Imagination is more important than knowledge." -AE

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              • #8
                Originally posted by WuNgUn View Post
                Maybe it's just me, but I don't think I'd run all of that off a single M2...
                Why not just 1 or 2 Bosch style relays switched on from the M2 to power all the accessories?
                Originally posted by eric_barcus View Post
                id do some seperate power supply for at least the external drive and lillyput or teh lillyput and usb hub, or usb hub and external, id remove two of the components from the M2
                If I did my power consumption calculations correctly, I should have enough power to run all of my components through the M2. But looking at my wiring diagram again, I realized that the HD Radio doesn't need regulated 12V, so I can just plug that right into my battery. Also, the only USB devices I'll be using are a GPS receiver, wireless keyboard, and USB for the touchscreen, so I guess I won't really need a hub anyway.

                So crossing out the HD Radio and USB hub, I shouldn't need another power supply for the Lilliput and DVD drive, right?
                2004 Mazda3 Carputer Worklog - Update 5/17/11: Carputer 2.0 Hardware Selection

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                • #9
                  This is slightly off topic...

                  But thank you so much for posting this! One of the things that was confusing the hell out of me was how to power the monitor and the computer. I figured there should be some easy solution involving the PSU but was concerned about the whole thing being overloaded.

                  Thanks again!

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                  • #10
                    I hope your not planning on using a PCI sound card with that M2!

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                    • #11
                      I have my system wired in a very similar fashion to your diagram. Right now, though, I'm having troubles with radio reception while the computer and monitor are on. I haven't completely diagnosed the problem, but I think GROUNDING of either the audio system or the accessories I am running off the 12V and 5V rails could be an issue.
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                      • #12
                        Originally posted by mstaedt View Post
                        I have my system wired in a very similar fashion to your diagram. Right now, though, I'm having troubles with radio reception while the computer and monitor are on. I haven't completely diagnosed the problem, but I think GROUNDING of either the audio system or the accessories I am running off the 12V and 5V rails could be an issue.
                        Are you using a HD Radio receiver? If so, you might need to ground the RCA's on it...

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                        • #13
                          i have 2 amps and a Capacitor and i can't run a 16gauge from it to one of my amps remote wire...

                          the capacitor turns on but the two amps shine red.

                          I need to have a Relay that the J6 Flicks on then the Relay supply's a good stronge feed to both my amps.
                          I Live In Australia :D

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                          • #14
                            My remote 'amp on' powers on 3 of my amps without any problem...
                            Run the 16AWG from the amps directly to the J6 without going thru the cap.

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                            • #15
                              Originally posted by WuNgUn View Post
                              I hope your not planning on using a PCI sound card with that M2!
                              I'm curious as to why you bring this up? I've been running a Jetway board with an Audigy 2 PCI via KX Drivers on a M2 for a little over 2 years with no noise problems at all. If everything is grounded correctly you should not have a problem.
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