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Thread: Dual Power Supplys

  1. #1
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    Dual Power Supplys

    I searched and couldnt come accross a definate answer. What I am interested in doing, is using a dc-dc powersupply for my car computer. I also want a home based ac powersupply for tweeking in the garage, and using at a friends house, if i want to access my computer remotely.

    The solution I would like to come up with is a way to use both power supplys with a switch. I could use a battery charger, and that would be fine, except it would be easier to be able to plug my computer in while away from my house.

    Are there people running a setup like this? Im sure their are! I was just wondering if somebody could give me alittle bit of insite on what to do!

    I see there being a problem powering all of my divices (cdrom and acc.) using a splitter. Do people just split all of the divices needing power? Is it okay for the dc power supply to recieve power backwards through the ac power supply?

    Thanks so much for the help guys. Ive been reading this site for about a year and am going to take the plunge with tax returns. I cant wait!

    Thanks again...

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    The problem is that you have so many individual wires that would need to be switched. A standard ATX motherboard connection is 20 individual wires. There's also the 4-pin 12v (if your motherboard utilizes it), molex connectors for drives and so forth.

    Your best bet is to take a beefy ATX power supply and hack a molex connector to supply 12v to your DC-DC power supply. Another option is a 12v power supply that will provide enough amperage for your DC-DC power supply.

    Or just use a laptop for your car system.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  3. #3
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    that's kinda like putting an 8 cyl under the hood for when you really need the power, & then putting a 4 cyl in the trunk for when you want fuel economy.... not to practical really.....

  4. #4
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    I dont see why i cant use the M2-ATX power supply, and find a universal 150w power adapter for a laptop, and wire in a connector for it. Ground one side of the connector, and put a switch inbetween the positive side of the power supply and the power adapter, inside the case.

    When I have the car off, and plug in the laptop style adapter, it would be powering it. If I have read the specs for the M2-ATX power supply correctly( http://resources.mini-box.com/online/M2-ATX/specs.pdf ), it states that the maxumium input voltage is 24V.

    I found an example of what I am thinking of on ebay:
    http://cgi.ebay.com/SONY-150W-AC-Pow...QQcmdZViewItem


    Am I mistaken? Can I do what I am describing here? It states that the output voltage of the sony adapter is 19.5 volts. Is that okay to power the M2-ATX with?

    Thanks for the help guys!

  5. #5
    Neither darque nor pervert DarquePervert's Avatar
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    No, that's not going to work.
    That Sony unit provides 19.5, but only 7.7A. The M2ATX requires 10A to funtion.

    You don't see why it wouldn't work because you don't understand basic electricaly concepts about current and power.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  6. #6
    Low Bitrate grimor2000's Avatar
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    I'm not sure if this is what you're talking about since I can't understand what you're saying or now... but this is what I use to power my carputer when it's outside of my car.

    http://cgi.ebay.com/150W-12V-DC-Powe...QQcmdZViewItem
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  7. #7
    Low Bitrate grimor2000's Avatar
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    Quote Originally Posted by DarquePervert
    No, that's not going to work.
    That Sony unit provides 19.5, but only 7.7A. The M2ATX requires 10A to funtion.

    You don't see why it wouldn't work because you don't understand basic electricaly concepts about current and power.
    The M2ATX does not draw 10 amps all of the time, I would be surprised it it ever does in most cases. So the power supply would probably work, but it would produce excess heat because it is 19.5V
    Causa latet vis est notissima

    VIA SP13000
    1GB DDR400
    Slimline Slot-load DVD-RW
    60GB 2.5 Inch SATA 5400RPM
    Dual Active PCI riser
    PCI TV/FM card
    Logisys FP800
    Thermaltake VFD Media Lab
    M1-ATX

  8. #8
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    Okay, ive been thinking about this the wrong way. In my searches, people usually just used a battery charger while they were in the garage using their pc. So thats what im gonna do! Except, im gonna take it apart, add cooling(I can use a 110v fan, their cheap), and make it part of the install.

    I plan on using a female electrical outlet, mounted in the truck and a standard extension cord. The battery charger can be anywhere in the vehicle. This way, I am charging my entire electral system, and the battery can smooth out electrical spikes... So that takes care of the stereo too! Plus, if my battery runs dead, I just plug it in and away we go!

    Thanks for the help guys.

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