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Toroidal advice

Discussion in 'General Electronics Chat' started by silent_light, Mar 19, 2009.

  1. silent_light

    Thread Starter New Member

    Nov 6, 2008
    I have 4 toroidal transformers 220V 50Hz 40V 50VA each one.
    It's safe to connect the input (220V) parallel and the output in series (40V) for long use with an audio amplifier?
    What I get is 40V + 40V + 40V + 40V = 160V and 50 VA or 200VA?
    It would be 2 on each channel.

    If a have 2 toroidal connected like I sad, input parallel and output series can I have the bonus of center tapped?
  2. kubeek


    Sep 20, 2005
    Paralleling the primary is simple, as there is no other way it will work.
    If you connect all the secondaries in series (with the right phase) you will get 160Vac center tapped. That is 80Vac per rail, which makes up to +/-114V DC. This is quite high for such small wattage of 200W, so if you plan to use 4-8ohm speakers, you should use two transformers in series for EACH channel. That way you will have +/-57V rails, which is much more usable.