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Buck, Boost or Cancel ??

Discussion in 'Electronic Basics' started by Randy Gross, Aug 27, 2005.

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  1. Randy Gross

    Randy Gross Guest


    I have a question that is based on theory and is purely hypethetical.

    I have an energized 12 vdc circuit that I am testing when I accidently
    connect another 12 vdc source to the circuit so that voltages collide
    in "head_on" fashion.

    Aside from an interesting display and probable total circuit
    inceneration, will the voltages buck, boost or cancel each other.

  2. John Fields

    John Fields Guest



    I don't know that you have provided enough information to cover all
    possibilities. I.e. your circuit, your voltage sources and what the are
    referenced to and exactly how you are connecting them.

    In the most simple form, Two 12V batteries connected in parallel across a
    12V light bulb, Not much will happen, but you will have increased the amount
    of time the bulb will stay lit. I suppose not any two 12 volt batteries are
    exactly equal so there may be some current from the higher battery to the

    But it sounds to me, if you had an interesting display, that there is more
    to the story.
  4. John Larkin

    John Larkin Guest

    Ever jumped a car battery? If you parallel two sources, + to + and -
    to -, not much happens; if you connect + to - on both ends, you get

    If you have a 12 volt source powering a load, and you parallel another
    *identical* 12 volt source, they'll just share the load equally. If
    they're not identical, well, think of a big guy and a small girl
    picking up a tree limb together.

  5. Randy Gross

    Randy Gross Guest

    This has got to sound like a dumb question. I was thinking that in
    series-parallel circuits the additional voltage would add in series and
    trash the circuit.

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