power supply help ...need (+/-) 12v audio grade bipolar supply

Discussion in 'The Projects Forum' started by rockreid, Oct 23, 2012.

  1. rockreid

    Thread Starter New Member

    Oct 23, 2012
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    I am building a large modular synth case and am looking for a suitable bipolar power supply (+/-) 12v with at least 4 Amps output. Any help would be appreciated.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,155
    3,061
    Go take a look at Parts Express. You'll get an idea of what's available.
     
  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    http://www.linear.com/product/LT1084-Fixed

    not sure about a 4A negative linear.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    You could use two of the LT1084's , if the transformer has two separate 12 Volts windings.
    You could stack the two supplies then.

    Bertus
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
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    It is also important that you dimension the transformer correct. Do not get any transformer before conferring with us. If you want to draw 4 ampere continuous. A 4 ampere rated transformer will not do.
     
  6. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    Correct, that is the best way to go. Just make sure the negative reg is electrically isolated from the heatsink.
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    If you are feeding it into a FWB/capacitor to get the unregulated DC, you will need a transformer rated for about 7A RMS to supply 4A DC load current. With 12V output, the regs need at least 15V. I think you need a transformer rated for 14VAC secondary to allow a bit for ripple and load regulation effect. That would be a transformer with two 14VAC separate windings, each rated for 7A RMS.
     
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