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positive and negative 12 V dc from a +12V dc signal?

Discussion in 'Electronic Basics' started by davidd31415, Jun 10, 2005.

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  1. davidd31415

    davidd31415 Guest

    I'm looking for methods to obtain positive and negative 12 volt signals
    from a single positive 12 v signal (simultaneously, not simply
    reversing the polarity).

    I'm specifically looking for a circuit design and an explanation of how
    the circuit works.

    Thanks,

    Dave
     
  2. John Fields

    John Fields Guest

     
  3. Another possibility is that Dave means 'supply', not 'signal'.
     
  4. Bob Monsen

    Bob Monsen Guest

    Since you already have +12V, you really just need to get -12V. A smps
    chip, along with a bit of supporting circuitry, can do that rather
    easily; the idea is to, first allow, and then to stop current through an
    inductor. When you suddenly stop the current feeding the inductor, the
    magnetic field created by the current induces current to continue to
    flow. This generates a big negative voltage spike, which, if captured
    using a diode, can be used to create a -12V supply rail. Feedback
    controls the oscillator which is alternatly starting and stopping the
    current, and thus the output is regulated.

    However, rather than have me describe it to you, look at the linear site
    for inverting regulators here:

    http://tinyurl.com/933to
     
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