Dual supply using voltage multipliers

Discussion in 'General Electronics Chat' started by microelectronix, Jan 10, 2010.

  1. microelectronix

    Thread Starter Member

    Jan 21, 2008
    20
    0
    Hi all,

    So I have a 12.6-0-12.6 transformer which gives ~+/-16VDC. Can I use voltage multipliers to increase it to +/-32V?

    I still need a common connection, as it'll also be connected to the center tap of another transformer. The circuit will draw no more than 100mA (probably closer to 30mA, but 100mA is the high max), and I'll have regulators taking it down to ~+/-20V so ripple isn't too important.

    I guess another solution... anyone know a really cheap supplier of transformers so I could just get at least 18-0-18 at 100mA?
     
  2. S_lannan

    Active Member

    Jun 20, 2007
    247
    2
    you can use a voltage doubler on each rail.
     
  3. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    You should see what your supplies output is under load. If your reading 16v from a 12.6v supply it will probably drop to around 13v loaded. so even if you did double it to 32v, under light loading it would drop to around 26v.

    If you were hoping to power a 32v device with this idea, it needs a little more power.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You might just ignore the center tap, use one end of the secondary for ground, and use two rectifier diodes to create the positive and negative rails. You'll need larger filter caps, but with a 100mA load, and you're regulating it anyway, it might work OK without a lot of fiddling around.

    See the attached.
     
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