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Quick transformer question

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

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  1. SpaceFace


    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


    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


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


    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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