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Thread: unable to play USB HDD 40 GB

  1. #21
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    With regard to powering low-current DC equipment with AC inverters...wouldn't it be easier just to jumper the +5V power leads to the drive to the output of a 12V-5V DC-DC converter? I mean, it'd be hella lot more efficient, less expensive, and could be wired directly to a +12 volt source...tiny, $10 adapter from radio shack vs. much more expensive, larger, noisier, and less efficient 120V AC inverter...that seems like a no-brainer to me.

    AC inverters in the car are generally a bad idea, unless you happen to be powering an AC motor of some kind. By rule of thumb, assume they consume 30 watts just being on, then assume they waste a watt for every watt they produce, then factor in the wasted power it takes to convert to DC again. The only thing they really bring to the table is a compatible AC outlet for products designed for home use.
    I have too much time and too little aggravation in my life, so I built a carPC. ;)

  2. #22
    Newbie defgr's Avatar
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    Quote Originally Posted by hithere View Post
    With regard to powering low-current DC equipment with AC inverters...wouldn't it be easier just to jumper the +5V power leads to the drive to the output of a 12V-5V DC-DC converter?
    Good point hithere.
    But... how many know how to do that???
    How many will hack the power cord?
    Quote Originally Posted by hithere View Post
    I mean, it'd be hella lot more efficient, less expensive, and could be wired directly to a +12 volt source...tiny, $10 adapter from radio shack vs. much more expensive, larger, noisier, and less efficient 120V AC inverter...
    I could not agree more...
    But I was trying to lead "mvmps" to a DIY solution with separate HDD and case, and he keept asking me about ready made solutions like Seagate FreeAgent Go and WD Passport. So I assume that he does not have the knowledge to do somethinh so advanced like this that you propose.

    Quote Originally Posted by hithere View Post
    AC inverters in the car are generally a bad idea, unless you happen to be powering an AC motor of some kind. By rule of thumb, assume they consume 30 watts just being on, then assume they waste a watt for every watt they produce, then factor in the wasted power it takes to convert to DC again.
    Sure does!

    Quote Originally Posted by hithere View Post
    The only thing they really bring to the table is a compatible AC outlet for products designed for home use.
    Correct!
    But Ready made 3.5" HDD comes with this philosophy... Home use.

    In every case, we are talking about a car's cockpit... Not our workbench.
    Safety MUST come first and all this cablemess does not guarantee that.

    defgr

  3. #23
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    Quote Originally Posted by defgr View Post
    Good point hithere.
    But... how many know how to do that???
    How many will hack the power cord?

    ...In every case, we are talking about a car's cockpit... Not our workbench.
    Safety MUST come first and all this cablemess does not guarantee that.

    defgr

    Well, this IS a forum for people putting PC's in their car, so I sometimes expect the level of knowledge to be a little higher, especially in this regard...and safety being an issue, how's this inverter going to be wired? To a cigarette adapter plug? Most of these circuits are rated around 40-90 Watts, right? Not hard to pull that once one factors in the inefficiencies.
    I have too much time and too little aggravation in my life, so I built a carPC. ;)

  4. #24
    Newbie defgr's Avatar
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    Quote Originally Posted by hithere View Post
    Well, this IS a forum for people putting PC's in their car...
    Hacking a wire or a circuit has nothing to do with puting things together by connecting plugs or sloting in a memory...
    I suppose that you know how to use a soldering iron and you know what you are doing.
    This is an inverter:
    http://cgi.ebay.ie/75W-CAR-POWER-INV...QQcmdZViewItem
    I think that it is safe...

    Any way.
    Since the topic is not about inverters, and as I said before I agree with you that using an inverter is crap, I'll stop here.

    defgr

  5. #25
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    is this the solution?

    I found this and I ask me if this could help with my car stereo?


    http://www.aerocool.com.tw/periphera...b/powerusb.htm

    can I connect this 5V cable to my car?

    thanks

    m.s.

  6. #26
    Newbie defgr's Avatar
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    This cable goes here:
    http://www.aerocool.com.tw/periphera...powerpanel.htm
    It supposed that it gives you 5V through usb plug and 12V through the universal adaptor.
    The other end is tailor made. Is made to match their panel outlet.
    If you can work it out, ok. But I don't think that you could plug it in any usb... It won't fit.
    [HL]defgr[/HL]

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