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Quick transformer question

Discussion in 'General Electronics Discussion' started by SpaceFace, Feb 27, 2012.

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  1. SpaceFace

    SpaceFace

    2
    0
    Feb 27, 2012
    I am working on a project that requires both a 18V and a 9V supply. Can I get this from a single transformer with two secondary 9V windings?

    I was planning to connect the ground of the primary winding to the v+ of the secondary and connect the 18V part of the circuit across both windings and the 9V part of the circuit just across one of the windings. Is this advisable/safe?

    Thanks in advance!
     
  2. jackorocko

    jackorocko

    1,284
    1
    Apr 4, 2010
    I wonder if you could take a 18V secondary with a center tap and connect one side to GND and then the center tap would be 9V and the other side be 18V. Though I have never tried it before. Seems reasonable
     
  3. SpaceFace

    SpaceFace

    2
    0
    Feb 27, 2012
    I think that's essentially what I would be doing by connecting the primary and secondary windings together.
     
  4. duke37

    duke37

    5,364
    770
    Jan 9, 2011
    If you want DC, connect the two windings in series and place a bridge rectifier across the total 18V.
    The 18V is available from the bridge rectifier and 9V from the winding centre tap.
     
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