A few Q's about split rail power supply

Discussion in 'General Electronics Chat' started by prometei, Mar 4, 2015.

  1. prometei

    Thread Starter Well-Known Member

    Apr 13, 2008
    56
    0
    hi,

    I've seen a few diagrams on the net on how to get virtual ground, one example was with the two 9V batteries.:

    [​IMG]

    Would it be possible to replace those batteries with two DC/DC buck converter modules (potentially needing to modify the circuit), e.g. based on the LM2596 IC?

    [​IMG]

    2. Are there 1 to 1 transformers with a center tap? I have a few 220V AC/AC transformers with 16V 1A output, was wondering if I could use one of the above described transformers to get a split supply.

    3. I have a 7660 voltage converter chip, but it can only supply 10mA on the output. Not sure if I could connect some power transistors to it to increase the output capacity?

    4. Is an op-amp+transistor solution a better alternative, e.g.: http://www.redcircuits.com/Page114.htm

    thanks!
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,571
    2,381
    Sounds like you need a CT secondary, a 16vac secondary will give you ~22vdc.
    Max.
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    The 2596 is not an isolated-output converter (the 0V line goes straight through), so cannot be used as you suggest.
     
  4. PeterCoxSmith

    Member

    Feb 23, 2015
    148
    38
    TI rail splitters are pretty good, I've used them...http://www.ti.com/product/tle2426

    Peter
     
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