[sdiy] Transformer question

[Bert Schiettecatte]

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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