Where should the center tap be on a transformer with 2 secondary windings?

Discussion in 'The Projects Forum' started by electronice123, Jun 9, 2009.

  1. electronice123

    Thread Starter Senior Member

    Oct 10, 2008
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    Where would the center tap be placed on the following?

    Transformer secondary has 2 wires wound together on the same bobbin. One wire is red, the other green. The wires run the length of the bobbin and then one wire goes back to the top where it connects to the other. The transformer only has 1 wire on each end, 1 green, 1 red as they are connected together.

    Basically current flows through the bobbin twice.

    Would the center tap be placed where the two wires connect?

    Or would it be placed at the center of the bobbin at each seperate wire?

    In this case the center tap is used to equalize the positive and negative voltages and is connected to ground.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    What brand and type of transformer is it?
    I attached a datasheet of an amplimo torioid transformer.
    There you see how the connections are made for double current and center tap.

    Greetings,
    Bertus
     
  3. electronice123

    Thread Starter Senior Member

    Oct 10, 2008
    302
    0
    It's not any particular brand transformer. It's one I have been trying to figure out how to build. From what i know the secondary is bifilar, both wires fill the bobbin then one wire goes back to the start (top) and connects to the other.

    The transformer is meant for high voltage (20kV+) and low current (>10mA).

    I think I need to split each wire (red and green) for the center tap, rather than center tap it where the two wires are to be soldered together.

    [​IMG]
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    In the datasheet I gave you, you will see dots near the windings.
    The dots state the start of the winding.
    I think the left drawing will be the nearest to that statement.

    Greetings,
    Bertus
     
  5. electronice123

    Thread Starter Senior Member

    Oct 10, 2008
    302
    0
    ok bertus, Thanks for all your help. I really appreciate it!!!
     
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