[sdiy] Transformer question

[Theo]

Check with "planar cores" from Ferroxcube or Epcos.
They are made for exact this application.

Theo
 

----- Original Message ----- 
From: Bert Schiettecatte <bschiett at etro.vub.ac.be>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, July 22, 2004 5:25 PM
Subject: RE: [sdiy] Transformer question


> 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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