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Toroidal transformer replacement

Discussion in 'Power Electronics' started by yossi, Feb 10, 2020.

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  1. yossi


    Jul 26, 2014
    I want to replace a dead subwoofer transformer with a toroidal one. The original transformer was a 230V/12V 2.5A.

    So far I've only been able to find dual secondaries torodial transformers. I understand their rating refers to the total output, so if I'm going to use just one secondary winding I'll be looking for a 60VA transformer (expecting 30VA).

    My question - would it be possible to just connect both secondaries to the same rectifier circuit? My assumption is that won't work because of phase, but I would be really happy to know if that's correct. Thanks!
  2. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Yes, just parallel the secondaries to double the va output. That is provided they share the same primary.
    yossi likes this.
  3. Minder


    Apr 24, 2015
    In general, identical secondaries are wound bi-filar, which essentially means they will be balanced when connected in parallel.
    They each have to be in phase however!
    This is generally indicated by the start of each winding.
    yossi likes this.
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