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Thread: Hmmm, 3677 case + power brick

  1. #1
    Variable Bitrate NJay's Avatar
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    Hmmm, 3688 case + power brick

    Don't think this has been raised as a quick search of 3677/88 case did reveal some threads but nothing similar.

    I bought the 3688 case (www.ultim8pc.co.uk for 72 inc VAT + Del) and its now got my Epia800 in it working great. (BTW you can use the front USB ports as all you need to a cable costing 3 that converts the Epia800 miniusb MB socket to regular USB sockets but hey I'm digressing)

    What's puzzling me is that on the power brick (model BW6012) itself its says

    INPUT: AC 100-240V ~ 1.8A 50-60Hz
    OUTPUT: 12-14V 5.00~4.28A (12V 5A)

    If the power brick can give out 12-14V why on earth did they fit the Morex 60w DC-DC board that says it needs a 12v input??? If the DC-DC board is able to cope then surely this makes it suitable for 12v car usage?

    At present I have a 300w invertor in the car so its no great loss but it would be nice to know that I could move to directly powering it.

  2. #2
    Raw Wave Confused's Avatar
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    I am using the Morex DC-DC in my car, directly, without any voltage regulator.

    It works pretty well Only problem it has is powering up the 7200rpm drive with the engine off, and keeping it powered for more than a few minutes once it is spun up when you switch the engine off (hard drive stops spinning after about 3-5 minutes), and it still resetting when you turn over, but other than that, it's fine for my uses


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  3. #3
    Variable Bitrate NJay's Avatar
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    That's good to hear
    I'm running a laptop DVD and HDD so hopefully shouldn't have the HDD power issue.

    What worried me was the remarks on http://www.procase.com.tw/mainpage2003.htm as it I would guess others have tried the direct approach and its fried.

    The other thing to note is the input reqs for the dc-dc convertor are 11.4-12.6 and the Output of the power brick is 12-14v. That's not much overlap then

  4. #4
    FLAC
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    Guys!!! CAREFUL!!

    The external "brick" provides a regulated +12V(+/-5%, or 11.4 to 12.6V) output. This is fed to the internal Morex PSU, but there is NO FURTHER +12V REGULATION on the internal PSU board. The 12V from the brick is fed DIRECTLY TO YOUR MOTHERBOARD. If your feed the internal PSU with "12V" directly from your car, you may end up with 18V(or more) spikes on your 12V mobo rail.......(this can cause very ugly things to happen).

    I have the Casetronics C134 case which uses this same "brick"+internal PSU. I have removed the PSU and traced the PCB traces. You can see the input 12V line feeding directly to pin 10 on the ATX PS connector (ie, there is NO internal regulation on this line).

    I have not been able to come up with a good way to replace this AC brick with something DC. However, I have asked Kris at Opus to consider building a "pre-regulator" that can provide +12(+/-5%) from an input of +9v to +20v with spikes. He's "thinking about it", but is probably too busy. Any of you wiz kids want to take this on? You could actually put a shutdown ckt in side and run it to the PWR ON pins in the case.

    Anyway....caution about bypassing the ugly brick....
    MikeH

  5. #5
    Variable Bitrate NJay's Avatar
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    That's my point MikeH

    Read my 1st post and you will see that the specs on the underside of the power brick supplied with my 3688 case says it outputs 12-14v.

    I can take a photo if you want to show what the underside says.

  6. #6
    FLAC
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    NJ sorry, I misunderstood your intent. I guess I was thinking about Confused's comment
    I am using the Morex DC-DC in my car, directly, without any voltage regulator
    ....that should cause problems at some point (ie car alternator feeding the +12V rail on his mobo).

    BTW..I have the same brick. Not sure why they say 12-14v. Does not make sense.
    MikeH

  7. #7
    Variable Bitrate NJay's Avatar
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    Well I've only just got the case so I don't think I'm gonna risk it

    You can see why I said it looks daft as the power brick and dc-dc board only overlap by 0.6v.

    Since you've gone to the trouble of tracing the wires and found that its a straight feed to the 12v+ rail. Its even more daft.

    Oh well never mind

  8. #8
    Newbie netgroover's Avatar
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    Smile

    Quote Originally Posted by NJay
    Well I've only just got the case so I don't think I'm gonna risk it

    You can see why I said it looks daft as the power brick and dc-dc board only overlap by 0.6v.

    Since you've gone to the trouble of tracing the wires and found that its a straight feed to the 12v+ rail. Its even more daft.

    Oh well never mind
    Hi NJAY, I'm looking at getting the 3688 case, so I'm interested in how you hooked it up to the battery. Did you do it direct, use an ITPS, OPUS etc. Any info would be appreciated.
    2001 Astra SRi

    Proposed Carsys:
    - Morex 3688
    - MII 10000
    - 256Mb RAM
    - 60GB HDD
    - TV/FM Card (via USB)
    - GPS (via USB)
    - Bluetooth (via USB)
    - Lilliput 7" LCD
    - DVD drive
    - WiFi (via Cardbus)

  9. #9
    Variable Bitrate NJay's Avatar
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    Currently running it off the supplied AC adaptor using my 300w invertor but will be running it off a DC-DC power brick that falken is sourcing from the far east.

    Find out more on 12v DC to 12V regulated 60W

  10. #10
    Newbie netgroover's Avatar
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    Quote Originally Posted by NJay
    Currently running it off the supplied AC adaptor using my 300w invertor but will be running it off a DC-DC power brick that falken is sourcing from the far east.

    Find out more on 12v DC to 12V regulated 60W
    Forgive my lack of electrical knowledge, but can't you go direct from the battery to the Morex's DC-DC convertor? Or even by via the Cigarette adaptor, if that makes a difference?
    2001 Astra SRi

    Proposed Carsys:
    - Morex 3688
    - MII 10000
    - 256Mb RAM
    - 60GB HDD
    - TV/FM Card (via USB)
    - GPS (via USB)
    - Bluetooth (via USB)
    - Lilliput 7" LCD
    - DVD drive
    - WiFi (via Cardbus)

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