small dual voltage ac/dc psu

Discussion in 'The Projects Forum' started by LED4LYF, Mar 10, 2011.

  1. LED4LYF

    Thread Starter New Member

    Aug 26, 2010
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    0
    I need to make a small dual voltage power supply with clean DC power. It does not need to put out very much amperage 1amp max, and I need it to be as small as possible. Any Ideas

    120vAC to 12v/5vVDC @ 1amp. Clean DC power is a must. And a small finished package would be great.

    Any circuits out there that meet my criteria?
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Do you really need to MAKE one, or just have one? Most phone chargers these days are exactly what you've described, and can be obtained cheap or free if you hunt a little.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, not dual supplies.

    If the 5vdc requirement is low (say for logic circuits), you might get a 12v 1A plug-type switching regulated supply, and add a 7805 regulator and a couple of caps. If you need more than about 100mA current @ 5v, might use two separate switching regulated plug supplies.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Oops, yes, I missed that. 12v supplies are not quite as common, but still an easier approach than building one. I believe external hard drive power bricks are usually 12v and have at least 1A ratings.
     
  5. LED4LYF

    Thread Starter New Member

    Aug 26, 2010
    10
    0
    I don't need to build one, but I was hoping for something small. I have a couple of wall warts that are 12volt, if that helps
     
  6. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    What are you trying to power?
     
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