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Thread: Cheap Ps

  1. #1
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    Post Cheap Ps

    Hey, I've been reading about all of this stuff without ever posting anything... I currently have my computer setup and running perfectly. Only proboblem is that I don't have a PSU for my car.

    So far I have paid nothing... (I still need to buy the LCD actually), and am really hoping to not pay much more.

    Is there any option that will let me spend at most around $50 for the PSU? If I can't get it for this price, I'm gonna have to simply keep it in my room... not to useful considering I already have a computer in my room.

    The specs of the machine are:
    600mhz pentium 3 (possibility of underclocking for less power?)
    ISA SoundBlaster
    WD 3gig HD: 5V: 0.4A, 12V 0.27A
    LCD (normally minimal power cunsumption)

    I could care less about the crank and everything... I just want to be able to turn it on while i'm driving to school and stuff...

    ANY methods that will cost me < $50 (US) and let me operate this bugger?
    I already have a 90w ATX power supply that everything is running on, but it says that it takes 2.5A in! thats aweful efficiency, and means that if I want an invertor for it, it will need to be about 300W... 300W->90W

    Anyway, I'd really appreciate it if someone could help me come up with a CHEAP solution to this problem. I find it hard to believe that a lot of people can afford the opus, i most definately can not.

    Thanks!

    Dwiel
    <a href="http://dwiel.no-ip.com">My Webpage!</a>

  2. #2
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    http://www.arisecomputer.com/ps/mpd810.asp This is probably your cheapest alternative for the system you describe, $79 direct from Arise.

  3. #3
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    Actually, for that setup the PW-70a might provide enough power. I'm not sure how much power the p3 consumes, but its a possibility. It is only 50$, and is the cheapest DC-DC power supply that I know of. You can get one for cheaper on ebay probably, too.

  4. #4
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    Just get the 300W inverter man, it'll be way cheaper than any DC-DC solution. For $50 I bet you can get even up to a 1000W just to be safe. As for the efficiency of the whole thing, I wouldn't worry too much about it... bottom line is that it'll make a difference of like 50 cents per tank of gas.

  5. #5
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    Quote Originally Posted by Sinorm
    Actually, for that setup the PW-70a might provide enough power. I'm not sure how much power the p3 consumes, but its a possibility. It is only 50$, and is the cheapest DC-DC power supply that I know of. You can get one for cheaper on ebay probably, too.
    The PW series does not regulate the 12 volt rail. His setup (3.5" harddrive, older motherboard) does use the 12v rail, so he need a more complete PSU for automotive use. The manufacturer actually recommends against using the PW series in a car.

  6. #6
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    Hey Bobby Digital 1000w invertor? For his 90w job...Dwiel if i were you i would step right up to a 5000w invertor that way you plug you house into you car. On this set up it might cause a few bucks in gas per tank.....J/K
    I am no expert on this issue but i think i remeber reading that you should be safe to use an invertor for around twice the watts you need. If you are about doing this set up cheap your not going to beat an invertor. Read some of the other forums some people are very pleased useing there invertor set ups.

  7. #7
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    Quote Originally Posted by Jay980
    Hey Bobby Digital 1000w invertor? For his 90w job...Dwiel if i were you i would step right up to a 5000w invertor that way you plug you house into you car. On this set up it might cause a few bucks in gas per tank.....J/K
    I am no expert on this issue but i think i remeber reading that you should be safe to use an invertor for around twice the watts you need. If you are about doing this set up cheap your not going to beat an invertor. Read some of the other forums some people are very pleased useing there invertor set ups.

    I was just saying that he could go up to his max price budget just to be safe and in case he wanted to power other things later. If he had the money he could get a 5000W if he really wanted, just cuz it says 5000W doesn't mean it's gonna use 5000W all the time. If the computer uses 100W, the inverter should use 100W. I use a 150W inverter so I do realize that these carputers do not require a lot of juice.

  8. #8
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    Thanks

    Thanks Guys! I will proobly go with the invertor path. It should come in handy later also.

    I plan on getting out my multi-meter tonight and measure how much wattage this thing really takes while in use.

    I was also thinking that I could try and alter the probram so that it loads say 10mins of music at a time so the hard drive can turn itself off... This might save some energy. I'm also thinking about underclocking it, but I can't figure out anywhere easy to do this with my system.

    I'll check tonight to see how much wattage this sucks and then get an invertor that can handle it.

    Will the LCD consume much power? I shouldn't worry about it right?

    Thanks again!

    Dwiel

  9. #9
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    I juts measured the ammount of power my power supply was consuming under different circumstances.

    Note: All measures are @ 120V
    Durring boot: .28A = 33.6W
    Idle with MPXOn, but nothing playing: .31~.32A = 38.4W
    With music playing (independent of volume): .28A = 33.6W

    Looks to me like I need nothing over 100W!

    Thats very suprising to me... Almoast too good to be true. I know where I can get a 150W invertor for about $20... Might even find one cheaper on ebay.

    Only problem, most 100W inverters aren't going to be very high quality right? How can I tell that I get an invertor with a sine wave or even close to one?

    Thanks!

    Dwiel

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