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+12, +6, -6, -12V Power Supply

Discussion in 'Electronic Design' started by David King, Jun 8, 2011.

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  1. David King

    David King Guest

    I am trying to powr an old test instrument with a dead supply.

    What would be the most straightforward way to make a regulated DC
    power supply with the following four voltages plus earth reference?

    +12V
    +6V

    0V (Earth reference)

    -6V
    -12V

    250mA per rail, eg. 1A total

    One possible option might be to use a 1A 12VDC regulated plugpack, and
    build from there. I assume that would eliminate the need to regulate
    the remaining three voltage outputs separately.

    Thanks for any suggestions.

    David King
     
  2. Rich Grise

    Rich Grise Guest

    Most straightforward? Four of these:
    http://www.radioshack.com/product/index.jsp?productId=2062243#

    and a sixteen-pack of alkaline D cells. (or four four-packs,
    etc.)

    Wiring the assembly appropriately is left as an exercise for the
    student. ;-)

    Cheers!
    Rich
     
  3. A power supply with +/-12VDC output and a couple of linear regulators
    (eg. LM317/LM337) and a few passives would be pretty easy. If the
    current drain is really 250mA per rail then it will dissipate an
    additional 3W in the regulators (1.5W each), so they'll need small
    heatsinks.

    If it's a sensitive instrument you might need to pay attention to the
    quality of the supply (for example, ripple on some or all of the
    rails).


    Best regards,
    Spehro Pefhany
     
  4. I would go for a +/- 5v regulators a diode voltage drop above ground.

    Unless you can get a LM7806
    <http://www.mouser.com/ProductDetail...GAEpiMZZMtUqDgmOWBjgC5jv%2bsRCBsGZMB3bTuZR2c=>

    and a 7906
    <http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/LM7906CT/?qs=AxPfoIcMNKLKLeFrwsA0LA==>

    Mouser also has OnSemi 6 volt regulators.

    I think the +/- 12v would be trivial.

    Cheers
     
  5. Winston

    Winston Guest

    Fred Bloggs wrote:

    (...)
    That's 'Fronkensteen'.


    --Winston
     
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