Newbie question about transformers

Discussion in 'General Electronics Chat' started by ranch vermin, Aug 28, 2015.

  1. ranch vermin

    Thread Starter Member

    May 20, 2015
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    If I put a dc square wave into into a transformer, do i get a sine wave out the other side?
     
    Last edited: Aug 28, 2015
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    An iron-lamination transformer will indeed act as a low pass filter -- however the 'DC' offset will cause both saturation and excessive primary heating...

    Best regards
    HP
     
  3. Sinus23

    Member

    Sep 7, 2013
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    Way better answer than mine.
     
  4. paulktreg

    Distinguished Member

    Jun 2, 2008
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    Probably one of the most unhelpful answers I've heard in a long while!

    Does the transformer know whether the input is AC or DC if it's a sine wave or square wave?

    Frequency dependent I suppose?
     
  5. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    I'm sorry you find my response unhelpful...

    I shouldn't think non-sentient objects could be said to 'know' anything --- Your statement seems to be a non sequitur?:confused:

    As regards wave shaping/frequency dependance:
    In lieu of specifics I assumed and stipulated an iron (lamination) core (and, hence, markedly "frequency dependent") transformer...

    Best regards
    HP
     
    Last edited: Aug 28, 2015
  6. ranch vermin

    Thread Starter Member

    May 20, 2015
    85
    2
    plumbers revenge.... :(
     
  7. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    Hey, @ranch vermin -- Should you likewise find my response 'terse' or otherwise unhelpful - please refine your question and I'll be glad to offer a more comprehensive response:):):)

    Very Best Regards
    HP
     
  8. ranch vermin

    Thread Starter Member

    May 20, 2015
    85
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    Its ok I did learn thanks - I was just half joking around.

    The musical puzzles led me to believe it depends if the square wave is ac or dc?
     
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  9. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    Plumber's revenge? Musical puzzles? --- So, are we talking a video game?:confused: --- Anyway - pleased you got your answer!:)

    Best regards
    HP
     
  10. #12

    Expert

    Nov 30, 2010
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    Very frequency dependent. I have seen transformers specifically designed to pass square waves inside a 1% precision machine, but they were not iron core. An iron core transformer can be taught to pass a square wave by applying the right capacitance in the right places, and in the right frequency range, but it will not automatically make a sine wave, just a sloppy square wave.
     
  11. ranch vermin

    Thread Starter Member

    May 20, 2015
    85
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    Thanks gentlemen, In an ac sine wave case, is signal completely distorted but are peaks preserved through... i dunno maybe ~100 transformers in series? The cause is I have a crazy idea about using transformers as switches on a home from scratch made chipboard computer of wires and nails! (used as solenoid transformers.)

    Dirty old rusty piece of poop on a bit of cheap wood - cant wait.

    I guess I have to go get my wires and nails to know for sure - I looked it up on youtube didnt find anything useful.
     
    Last edited: Aug 28, 2015
  12. #12

    Expert

    Nov 30, 2010
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    Same answer as my last post. The full moon is tomorrow.
     
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  13. crutschow

    Expert

    Mar 14, 2008
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    Any square-wave is AC but if it has any DC offset (average value is not zero), that will tend to saturate the transformer. The DC offset can be nulled by AC coupling the square-wave through a series capacitor.
    How well the transformer transmits the square-wave depends upon the frequency response of the transformer and the frequency of the square-wave, but it will not, in general, convert the square-wave to a sine-wave.
     
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  14. ranch vermin

    Thread Starter Member

    May 20, 2015
    85
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    Sorry guys, NOW I GET IT!

    Just because current doesnt pass 0 doesnt mean it isnt alternating, ill remember that for next time instead of confusing the lot of you with my inane gibberish and poor reading of the help provided.
     
  15. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    What does that mean about me? I think I followed along with everyone involved without any confusion.\ whatsoever

    (Kermit runs to ask his wife if he has missed any meds lately) :)
     
  16. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    FWIW By way of avoidance of just such confusion the term 'Pulsating DC' is commonly applied to varying 'functions' having offsets preclusive of polarity inversion...

    Best regards
    HP :)
     
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