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Var. split supply from SLA's

Discussion in 'Electronic Design' started by James Oliver, Jan 6, 2007.

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  1. James Oliver

    James Oliver Guest

    I need to run a power op amp circuit in the field from batteries. I
    intend on uisng two 12 volt 7.2 AHr sealed lead acid batteries in
    series with the center as virtual ground.

    The rail voltages need to be individually adjustable.

    What is the most efficient way to do this without wasting undue
    battery current, and preferably without IC regulators?

    Please note power consumption is about 15 watts. I believe that would
    be to high for a standard potentiometer voltage divider.

    Any ideas?

    Jim Morris
  2. Phil Allison

    Phil Allison Guest

    "James Oliver"

    ** Yep - one positive and one negative switching regulator.

    Not simple and will involve ICs.

    ....... Phil
  3. mkaras

    mkaras Guest

    You want to use some type of regulator technology. A linear type
    regulator will be more efficient than a voltage divider or
    potentiometer type power source to provide the reduced power supply due
    to the need of that type circuit having to consume goodly amounts of
    the power in both the "upper" AND "lower" legs of the divider. A small
    switcher type supply will be way more efficient than the linear type

    - mkaras
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