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Need a transformer — Parallax Forums

Need a transformer

computer guycomputer guy Posts: 1,113
edited 2010-05-27 01:24 in General Discussion
Does anyone know where I can purchase a transformer with the following specs?

Input Voltage: 240VAC (50Hz) Mains
Output Voltage: 12VDC
Output Current: 10A



Thank you smile.gif

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Comments

  • LeonLeon Posts: 7,620
    edited 2010-05-25 02:46
    You won't get DC out of a transformer.

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  • computer guycomputer guy Posts: 1,113
    edited 2010-05-25 06:02
    AC and a Bridge Rectifier then tongue.gif

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  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2010-05-25 06:37
    If you actually mean a regulated power supply rather than a AC transformer (part of a power supply) then your best bet is to get a switching power supply.
    cgi.ebay.com.au/Universal-12V-10A-DC-Switch-Switching-Power-Supply-354-/190357138504?cmd=ViewItem&pt=AU_Building_Materials&hash=item2c522b6c48

    If you try to regulate to 12V @10A yourself you may find it is not as easy as it looks plus the 50Hz transformer would have to be rated at over 120VA so it would end up a little bulky and heavy.

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    *Peter*
  • pacmanpacman Posts: 327
    edited 2010-05-25 06:46
    I probably have a unit similar to what Peter linked too in my 'box of bits' at home.

    How tight are you on that spec?

    You're in Australia right? If I have one (I'll check later tonight) then you can have it for the cost of postage....

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    Which way to the future?
    =================
  • computer guycomputer guy Posts: 1,113
    edited 2010-05-25 06:59
    Hello Pacman,

    It is to power a mini ATX power supply that is designed to run off of a car battery, but I need to run it from mains (I got the mini ATX because of its size).
    Yes I am in Australia. Thank you for your generosity, please PM me if you have one and I will arrange payment and provide you with my address.

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    "powered by Propeller" domed stickers $1.50 - Find them here
    Check out my Design and Technology project for my Higher School Certificate www.ecosureblog.net

    The Sarah Myatt Fund - Help Sarah and Her Family Fight Quadriplegia HERE
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-05-25 08:13
    Mini ATX?
    You mean a small motherboard?

    If so, perhaps just get an old PC that nobody wants anymore
    and use it's pwr supply to power your ATX board?

    If you must have 12v DC at 10 amps then use the same old PC supply.
    You will have to rework it but it is not too difficult I have heard and you can
    find the information on the web. Most will take 240vac in 50hz
    so it should be perfect. If you do this please take pictures and post them
    here as I would like to see how well it works for you smile.gif

    www.google.com/search?hl=en&source=hp&q=pc+power+supply+convert+12+volts+amps&aq=f&aqi=&aql=&oq=&gs_rfai=

    Post Edited (HollyMinkowski) : 5/25/2010 8:18:34 AM GMT
  • pacmanpacman Posts: 327
    edited 2010-05-25 09:04
    HollyMinkowski said...
    Mini ATX?

    If you must have 12v DC at 10 amps then use the same old PC supply.
    You will have to rework it but it is not too difficult I have heard and you can
    find the information on the web. Most will take 240vac in 50hz
    so it should be perfect. If you do this please take pictures and post them
    here as I would like to see how well it works for you smile.gif

    www.google.com/search?hl=en&source=hp&q=pc+power+supply+convert+12+volts+amps&aq=f&aqi=&aql=&oq=&gs_rfai=

    @Holly, I have done exactly this thing (can only supply a photo of the completed object - not the build. If you're interested). Though I used a small-mini power supply, so my +12V is only rated @ 1.5A. But a quick look at my bigger (real) power supply's shows a few that could do 12V @ 10A.

    I also note that sparkfun sell a breakout board www.sparkfun.com/commerce/product_info.php?products_id=9558 to help make this sort of thing easier...

    @ComputerGuy. Holly speaks wisdom - perhaps she offers a cheaper, better solution?..

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    Which way to the future?
    =================
  • computer guycomputer guy Posts: 1,113
    edited 2010-05-25 09:27
    Holly, I think you misunderstand me. I have an ATX power supply, not a motherboard.
    However the ATX power supply rund from 12VDC not 240VAC.

    www.mini-box.com/s.nl/it.A/id.301/.f

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "powered by Propeller" domed stickers $1.50 - Find them here
    Check out my Design and Technology project for my Higher School Certificate www.ecosureblog.net

    The Sarah Myatt Fund - Help Sarah and Her Family Fight Quadriplegia HERE
  • computer guycomputer guy Posts: 1,113
    edited 2010-05-27 01:24
    I found a decent power pack on ebay.

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    "powered by Propeller" domed stickers $1.50 - Find them here
    Check out my Design and Technology project for my Higher School Certificate www.ecosureblog.net

    The Sarah Myatt Fund - Help Sarah and Her Family Fight Quadriplegia HERE
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