-ve voltage from single +ve supply

Discussion in 'General Electronics Chat' started by shaun, Feb 23, 2005.

  1. shaun

    Thread Starter New Member

    Feb 23, 2005
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    0
    Please can anybody give me a method to convert a +12V supply to a -12V supply without the use of opamps. We do not have a -ve power supply on board and want to avoid the use of a -ve supply battery. Since opamps requires a -ve supply, it is ruled out.
    Please help me out.
     
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi

    here's a circuit to derive a negative output from a positive rail. however this has certain limitations like the current output. with light loads this can suffice. but if you need as high as 500ma. you can use TL497A as polarity inverter, although it was originally designed for downward or upward transformation application, this device is from Texas Instrument, check on the datasheet. :)
     
  3. shaun

    Thread Starter New Member

    Feb 23, 2005
    8
    0
    Thanks very much. I'll revert to you as soon as I try it.
     
  4. shaun

    Thread Starter New Member

    Feb 23, 2005
    8
    0
    Tried TL497A. Works great. Thank you.
     
  5. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi shaun,

    am glad that device help solve your problem :)
     
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