Power supply

Discussion in 'General Electronics Chat' started by GAMZ, Nov 15, 2011.

  1. GAMZ

    Thread Starter New Member

    Nov 11, 2011
    1
    0
    Hey EveryOne

    It´s my first post.
    I have a circuit which need +/-15V, but I want make use of only a single +15V supply. The output current required is 300mA.



    Regards
    Gamana Maganti
     
  2. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    By definition a supply that supplies both is a dual supply. The transformer is typically the component that is shared by the two suppliesl. I would suck it up and build a dual supply: why not, they are pretty simple.

    Why do you want the supply, there may be other options.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You can generate a negative voltage from a positive at that current using a switching regulator.

    You will probably find that it is less expensive to simply use a pair of 15v "wall wart" plug supplies, and wire them in series.

    You could also use a single 30v supply, and use a power opamp with a resistive divider to generate a "virtual ground".
     
  4. Wendy

    Moderator

    Mar 24, 2008
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  5. samin

    Member

    Oct 14, 2011
    32
    6
    You can use a positive and negative regulators. The input to the positive and

    negative rails go to the appropriate regulator input. The grounds are tied

    together, and this is your virtual ground.
     
  6. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47

    This is not a very good way as the regulators output source current, not sink it ( for most regulators ). Unless you
    already have the common ground as you would with separate rectification for the two sides of the supply. A dual supply ( at least with linear regulators ) is probably much simpler than a single one with an inverting switcher ( which might count as a second supply any way ).
     
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