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Thread: Project: Power House

  1. #101
    The floppy drive is no longer obsolete. AmEv's Avatar
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    Default Re: Project: Power House

    So, we got two Wills here now?

    This MIGHT get confusing.....
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    Toshiba Thrive: a very hacker-friendly tablet, backed by a company that's tighter than Apple.
    Argh....
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  2. #102
    Resident 100HP water-cannon operator SXRguyinMA's Avatar
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    Default Re: Project: Power House

    including you, 3 actually lol

  3. #103
    baaah. billygoat333's Avatar
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    Default Re: Project: Power House

    Quote Originally Posted by Omega
    ber is id elicous
    Centurion 5 Mod <<--- ON HOLD FOR THE WINTER

  4. #104
    The floppy drive is no longer obsolete. AmEv's Avatar
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    Default Re: Project: Power House

    Numbers.
    SXR.

    Who's the 3rd? Not me.
    Worklogs: ModCron : Macs : haXBOX 360 : VCRPuter : Aerostar : MiNiTvPc : Compaqs :
    iAES : SCRAP : S'CrapCase "
    Toshiba Thrive: a very hacker-friendly tablet, backed by a company that's tighter than Apple.
    Argh....
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  5. #105
    baaah. billygoat333's Avatar
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    Default Re: Project: Power House

    would be me. hence the smiley.
    Quote Originally Posted by Omega
    ber is id elicous
    Centurion 5 Mod <<--- ON HOLD FOR THE WINTER

  6. #106

    Default Re: Project: Power House

    Some great ideas here.
    I am not sure how, but a 24V supply would be advantageous, maybe most easily achieved by including a separate transformer, plus rectifier & regulator which could be an adjustable type for greater utility.

    Re the multimeter for digital voltage readout: that is the best & lowest cost approach although cutting the PSU panel to accomodate needs a bit of care. You also usually have a built in transistor tester & sometimes a capacitor tester & auto-ranging for a few more $$$. The other thing is that it may be better to retain the battery supply for the meter, most work on 9V & I suspect a ground connection for alternative supply might introduce spikes or other unwanted & hard to find "interference".

    I have wrestled with the issue of the best & most easily used connectors when building a similar unit. At first I also used binding posts but they are a pain when a quick connection is required. Finally I decided that screw down clamp terminals were all round the most convenient, just stick your wire in the hole & clamp it without damage by a screwdown. Best of all the whole connector is pretty well protected against accidental contact by the plastic moulding. Oh yes, & although not elegant top mount is the most convenient.

    I never thought about a fan (foolishly) believing that a bench supply is very rarely in use for more than a few minutes at a time. That's dumb & limiting when fans are cheap. Here (in Australia) however, you might need to incorporate a 1 mm square insect proof mesh - those damn insects love warm hard to access places.

    I'd love to see more detail about low cost lighting effects.
    Well done.

  7. #107

    Default Re: Project: Power House

    My final comment:
    This has been a wonderful project to follow, & see how community involvement has helped.
    The "24V+" solution is great even if it meant a "board from China".
    I was not surprised to see you experienced some "interference" on your meter (see my other post) but pleased you sorted it.
    Personally I don't like the cramped space but recognise how that came about.
    Also I don't like the hard edged box design which I think proved time consuming to make, although very flexible, & the materials are easy to work.
    All round a very well made & super useful bench PSU.
    Well done & thanks for the ongoing detailed explanations - I guess that applies to everyone here.

  8. #108
    Resident 100HP water-cannon operator SXRguyinMA's Avatar
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    Default Re: Project: Power House

    Thanks for you comments Peter and thanks for checking it out!

  9. #109
    Resident 100HP water-cannon operator SXRguyinMA's Avatar
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    Default Re: Project: Power House

    ok well now that the weather has warmed up I've noticed the readings are off again. The warmer it gets, the lower the readings. It'll be ~75 in the room, and with the fan in the window as night comes it cools down to ~65 and the readings go up by a volt or so on the 12v. right now it's ~77, the 3v is reading 3.3, 5v is 4.56 ans 12v is 10.47. The actual voltage is correct though.

    It would appear that I need to make some sort of temperature compensation for the ATMega. Apparently it's ADC is affected by temp. More on this later.

  10. #110
    Fresh Paint
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    Default Re: Project: Power House

    Resistors change values with temperature changes. Try using precision resistors

    Great project and documentaion.
    What LCD did you use?

    Thanks

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