[sdiy] Transformer question

[harrybissell]

You could only do that at a very high frequency.

The best solution would be two horseshoe shaped cores wound with
wire...so that when the two halves are brought together, the open ends
of the cores touch (or nearly touch) forming a complete circle...

H^) harry

Bert Schiettecatte wrote:

> Mmm.. I am wondering now whether I could implement my transformer by
> creating 2 PCBs with spiral inductors and bringing the PCBs close to
> each other. I wonder how efficient that would be and up to what distance
> that would work..
>
> bert
>
> -----Original Message-----
> From: jhaible at debitel.net [mailto:jhaible at debitel.net]
> Sent: donderdag 22 juli 2004 16:37
> To: Bert Schiettecatte
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] Transformer question
>
> > Thanks for the info. Why does the core have to be sheets of iron
> > seperated by an insulating material, and not a solid core?
>
> You need a ferromagnetic material to make a path of low magnetic
> impedance in order to direct the magnetic field the way you want
> it to go (i.e. from your primary to secondary winding, without much
> stray field).
> You want to avoid eddy currents (i.e. the ferromagnetic material acting
> like secondary windings of low electric impedance), so you either use a
> ferrite (not electrically conducting), or lamination (thin layers of
> material, that is electrically cunducting as well as magnetically,
> separated by thin layers of insulation to avoid the material forming
> closed loops above a certain size for the electric current.)
>
> JH.
>
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