- 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

--- 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

the

> 25:1 impedance transformation, I could use, in principle, any of

> 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 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:>

a

> 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,

> > 25:1 impedance transformation, I could use, in principle, any of

transformer?

> 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

> >

> > Thanks.

> >

> > Jim Rybak - 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

doesn't

> general rule practically used for a power supply transformer

> 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.

>