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2 transformers vs 1

Discussion in 'Electronic Basics' started by pil, Apr 7, 2004.

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  1. pil

    pil Guest

    I need about 1200VA power from a transformer. I need 52-0-52. What is the
    cheapest to take one huge transformer or 2 smaller ones wired in parallel?
  2. John Fields

    John Fields Guest

    Seems like just the savings in not having to deal with two separate
    items would make the 1200VA cheaper than two 600's, and that seems to
    be borne out by WW Grainger's catalog, which offers a vanilla Square D
    1.5S1F (1500VA) for $204.25, and a 750SV1F (750 VA) for $123.85.

    YMMV, do your own legwork and find out for sure...
  3. True. However if you're a purist and are going to use these for a
    stereo, then splitting the amps into two amps each with separate power
    supplies will give better performance. ANd also if you're fitting the
    xformer into a rack, then two may have a lower profile than one.

    Oh, one other thing. If you're gonna plug this into the regular wall
    outlet, then having two separate transformers may allow you to use two
    different outlets so that you don't overload a single outlet. But then,
    if you're going to need that much power, you should have a special power
    outlet installed. :p
  4. pil

    pil Guest

    Thanks John. Those things seem so expensive. I don't know where I am going
    to get the bucks for it. I need to do this for a design project at my
  5. pil

    pil Guest

    OK, so what will the difference be in using 2 (or 4) transformers compared
    to one? I am building a 4-channel amp and yes I am looking for the best
    sound quality.

    I heard that its best to use one PSU for all 4 channels because not all four
    are going to draw max power at once. This way the one channel has got more
    power available when needed while the other channels is "idle"
  6. Bob Masta

    Bob Masta Guest

    There is some sense to the "max power" argument, but it always seemed
    kind of lame to me. This kind of thing seems more appropriate for
    low-end commercial stuff, where they are trying to shave every nickel.
    It makes a whole lot less sense for an audiophile system. If you care
    about sound quality, you won't be running the thing that close to the
    rails in the first place. I think this is in the same category as the
    old bit about tubes sound warmer than transistors when overdriven.
    Yeah, so why would an audiophile be overdriving his system anyway?

    So, I'd tend to go for the best sound for realistic listening.
    If it clips a few watts lower, so be it. (If it makes a horrible
    sound when it clips, so much the better for telling the user
    to back off!)

    If you are building a guitar amp, then that's a different matter.

    Just my 2 cent's worth!

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
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