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How to create a step-down transformer?

Discussion in 'General Electronics Discussion' started by christoopher24, Sep 26, 2011.

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  1. christoopher24


    May 8, 2011
    I am need of knowing how can you create a step-down transformer.
    I know about ratios and things, but if for example there is a 10:1 ratio why is there so much more wire turns in the transformer, cause clearly you don't just make 10 loops.
    So anyway, how can I create a step-down transformer?
    Let's say for example 110v 60Hz, to 32v and less than 700mA.
    Any help would be appreciated!
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    You need lots of turns or the transformer will have very low inductance and at 60Hz will draw a huge current.

    Whilst this current is theoretically not in phase with the voltage and theoretically consumes no power, in practice the I^2R losses (which are real) and limitations in other areas mean that it's highly undesirable.
  3. daddles


    Jun 10, 2011
    Lots of articles about this have been written over the last century. Take a look at the following articles in Popular Mechanics: Feb 1950, May 1931, Dec 1932. These are all easily available on google books in the US (I've heard folks in other countries don't have access to them though).
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