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Thread: DC-DC PSU that is NOT opus/inverter question

  1. #1
    Maximum Bitrate jusatry's Avatar
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    Question DC-DC PSU that is NOT opus/inverter question

    hi everyone.

    i have a C134 w/M9000 motherboard, slimline DVD, 2.5" HD and a 7" Lilliput screen from HK i got on ebay. i am currently fabricating a setup to fit it in my double DIN dash.

    my question is about power. i bought a 300 Watt inverter from radioshack ($99), thinking i should better be safe than sorry in terms of having enough power. I thought i didnt want an Opus because i dont need a shutdown controller (my on/off button is in my dash) and becuase the case is already assembled with whatever PSU is in there and an AC adaptor that came with it.

    here is the actual question: 1. will the inverter, if hardwired, drain my battery if the computer is off? 2. where can i get a DC-DC power supply that isnt fancy, and therefore isnt pricy. I just need to get around the inverter - shutdown controller and startup on ignition are options i dont need. I also do not want to wait 4-6 weeks to get it.

    Any help is much appreciated.

  2. #2
    Raw Wave wizardPC's Avatar
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    1. If the inverter (which, by the way, you paid WAY too much for) is on, it will draw power
    2. there isnt really a good answer for this. you could get a pw-70 and the ITPS, or one of these, but that combo is not going to be "cheap", but it is cheaper than an opus
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  3. #3
    Maximum Bitrate jusatry's Avatar
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    Quote Originally Posted by wizardPC
    1. If the inverter (which, by the way, you paid WAY too much for) is on, it will draw power
    2. there isnt really a good answer for this. you could get a pw-70 and the ITPS, or one of these, but that combo is not going to be "cheap", but it is cheaper than an opus

    did i pay too much because i got a 300 watt one and i lonly need a smaller model, or because radio shack sucks? I just tested it on the car, and it doesnt put out a dirty audio line, so i am happy about that - it also has 2 plugs, which is convinient.

    any ideas on an easy on/off w/the ignition for the inverter, so i dont have to switch it each time i get in and out of the car? Also, how much should i pay/what brand should i get? i know i am supposed to wire it from the battery (to avoid blowing a fuse) and i also know i am supposed to put an inline fuse so as to avoid starting a fire.

    Any other suggestions are much appreciated. I hear that my C-134 case has no room for a DC-DC PSU in the case - is that one you linked to going to give me good power/not drain my battery? (my cig-lighter is always on).

    Thanks for the help.

  4. #4
    Raw Wave wizardPC's Avatar
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    you paid to much because radio shack sucks--see here

    I would (did) hook up a relay on the power line of the inverter to the accessory power of you car. that way, the inverter will get power only when the car is on, so if you leave the inverter power switch on the inverter will come on when the car does.

    then, depending on BIOS options, you can set the computer to "power on after AC loss" so the computer comes on when the inverter is turned on.

    you will still have to shutdown the computer manually with this method
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    Maximum Bitrate jusatry's Avatar
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    relay switch...

    how/where do i get one of these relays? are they easy to hook up? i am not electronically gifted but i can figure most things out. One question about the walmart/target brand inverter......why the price discrepancy? is it at all a quality issue? (will i be more likley to get a noisy output from the wal-mart brand than the shack brand?). Thanks so much for all the help.

  6. #6
    Variable Bitrate danon's Avatar
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    the thing is as long as you introduce AC out of a DC setup (e.g. inveter) you'll always going to have a humming/noise issue...
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    Maximum Bitrate jusatry's Avatar
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    gotta have the inverter :(

    Quote Originally Posted by danon
    the thing is as long as you introduce AC out of a DC setup (e.g. inveter) you'll always going to have a humming/noise issue...
    really? i tried mine out and didnt notice anything too bad.....but i was running the audio through the tape adaptor in (for my connvineince) so i expected a certain amount of hiss. Unfortunatly it apprears a DC-DC is out of the question with my C134 casetronic case packed to the brim.....any thoughts on minimizing the noise? i kinda see the inverter as a necessary evil. any brands that are better than others?

    thanks for the input

  8. #8
    FLAC
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    Jusatry,

    I have the C134 also. I bought the cheap WalMart inverter and had very bad nosie on my audio (I believe the cheap version does not filter the output of the inverter like many of the more expensive versions do).

    You CAN keep using the inverter, but the more elegant solution would be to get a 12V "pre-regulator" (the internal C134 power supply does NOT provide additional regulation to the incoming 12V from the car so you need SOME sort of 12V regulator) to feed directly into your C134 internal power supply. I bought the Radio Shack laptop adapter and the ITPS Shutdown Controller (bypassing it's on-board regulator) to provide turn-on & shut-down control over the carputer ( your will need to bring the PWRON control signal out to the ITPS). This setup does most of what the Opus solution does and allows you to keep your C134 chassis intact, and use the internal power supply. It works pretty well. The Opus would require you to run an ATX-like power cable into your chassis....(ugly).

    Anyway, the C134 chassis presents some interesting challenges. It's packed so full, you don't have many options.
    MikeH

  9. #9
    Maximum Bitrate jusatry's Avatar
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    Quote Originally Posted by MikeH
    Jusatry,

    I have the C134 also. I bought the cheap WalMart inverter and had very bad nosie on my audio (I believe the cheap version does not filter the output of the inverter like many of the more expensive versions do).

    You CAN keep using the inverter, but the more elegant solution would be to get a 12V "pre-regulator" (the internal C134 power supply does NOT provide additional regulation to the incoming 12V from the car so you need SOME sort of 12V regulator) to feed directly into your C134 internal power supply. I bought the Radio Shack laptop adapter and the ITPS Shutdown Controller (bypassing it's on-board regulator) to provide turn-on & shut-down control over the carputer ( your will need to bring the PWRON control signal out to the ITPS). This setup does most of what the Opus solution does and allows you to keep your C134 chassis intact, and use the internal power supply. It works pretty well. The Opus would require you to run an ATX-like power cable into your chassis....(ugly).

    Anyway, the C134 chassis presents some interesting challenges. It's packed so full, you don't have many options.

    If i dont care about a shutdown controller (the puter is gonna be in the dash and i have it set to shutdown when i push the power button), do i need the ITPS? in other words, does the laptop power thing regulate the 12v? if so can i just plug that straight into the C134 from the cig lighter?

    Another option i was considering was car adaptor from idot: http://www.idotpc.com/TheStore/Deskt...t.status=green . But people on other threads have been saying it only puts out 50-60 watts, which i think could be cutting it close with our case.

    Thanks for the help, its much appreciated. I am hesitant to open that case up for fear that i will not be able to get it closed again so any solution that does not involve any extra installations within the computer would be ideal.

    thanks in advance.

  10. #10
    Raw Wave Confused's Avatar
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    You're using an Epia, and not using any desktop drives, so IIRC, you're not using the 12v line anyway.

    I am using that power supply in my car, wired directly up to the battery, and I'm running a desktop hard drive (which uses 12V) and i've been using it for about 4 months without any problems.


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