## Impedance Matching Transformers

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• I know that the impedance matching ability of a transformer goes like the square of the turns ratio. However, if I want to have, say, a 25:1 impedance
Message 1 of 4 , Feb 2, 2003
I know that the impedance matching ability of a transformer goes like
the square of the turns ratio. However, if I want to have, say, a
25:1 impedance transformation, I could use, in principle, any of the
following number of turns which have a five-to-one ratio:

5 and 1
50 and 10
500 and 100
etc. (There are actually an infinite number of combinations)

How do I know what number of turns to use on the primary and
secondary sides of my transformer if I'm winding my own transformer?

Thanks.

Jim Rybak
• This may not be the best page, but it should give you a start. http://members.tripod.com/richard984/transformer_math.htm ... like ... the
Message 2 of 4 , Feb 3, 2003
This may not be the best page, but it should give you a start.
http://members.tripod.com/richard984/transformer_math.htm

--- In Electronics_101@yahoogroups.com, "James P. Rybak
<jrybak@m...>" <jrybak@m...> wrote:
> I know that the impedance matching ability of a transformer goes
like
> the square of the turns ratio. However, if I want to have, say, a
> 25:1 impedance transformation, I could use, in principle, any of
the
> following number of turns which have a five-to-one ratio:
>
> 5 and 1
> 50 and 10
> 500 and 100
> etc. (There are actually an infinite number of combinations)
>
> How do I know what number of turns to use on the primary and
> secondary sides of my transformer if I'm winding my own transformer?
>
> Thanks.
>
> Jim Rybak
• I took a look at the site. Lots of maths. Ugh.. I wonder if the general rule practically used for a power supply transformer doesn t work. At 50 Hz the number
Message 3 of 4 , Feb 6, 2003
I took a look at the site. Lots of maths. Ugh.. I wonder if the
general rule practically used for a power supply transformer doesn't
work. At 50 Hz the number of turns per volt for an ordinary silicon
steel core is around 50/S (S-the section is in square cm).
Probably the number of turns must be increased a little bit for a
lower frequency.

Regards,
work.

--- In Electronics_101@yahoogroups.com, "manifold <manifold_1@y...>"
<manifold_1@y...> wrote:
>
> This may not be the best page, but it should give you a start.
> http://members.tripod.com/richard984/transformer_math.htm
>
> --- In Electronics_101@yahoogroups.com, "James P. Rybak
> <jrybak@m...>" <jrybak@m...> wrote:
> > I know that the impedance matching ability of a transformer goes
> like
> > the square of the turns ratio. However, if I want to have, say,
a
> > 25:1 impedance transformation, I could use, in principle, any of
> the
> > following number of turns which have a five-to-one ratio:
> >
> > 5 and 1
> > 50 and 10
> > 500 and 100
> > etc. (There are actually an infinite number of combinations)
> >
> > How do I know what number of turns to use on the primary and
> > secondary sides of my transformer if I'm winding my own
transformer?
> >
> > Thanks.
> >
> > Jim Rybak
• Math is good. You no like math? Ugh like math. ... doesn t
Message 4 of 4 , Feb 7, 2003
Math is good. You no like math? Ugh like math.

--- In Electronics_101@yahoogroups.com, "workaholic_ro
<workaholic@c...>" <workaholic@c...> wrote:
> I took a look at the site. Lots of maths. Ugh.. I wonder if the
> general rule practically used for a power supply transformer
doesn't
> work. At 50 Hz the number of turns per volt for an ordinary silicon
> steel core is around 50/S (S-the section is in square cm).
> Probably the number of turns must be increased a little bit for a
> lower frequency.
>
> Regards,
> work.
>
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