[sdiy] Transformer question

[Magnus Danielson]

From: Glen <mclilith at charter.net>
Subject: RE: [sdiy] Transformer question
Date: Thu, 22 Jul 2004 11:36:25 -0700
Message-ID: <4.1.20040722113239.02e0cd90 at mail.charter.net>

> At 08:25 AM 7/22/04 , 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..
> 
> If you're planning on simply etching some spiral lines on the PCBs, and
> calling them inductors, you won't get very far with this idea. You really
> need some sort of iron or ferrite cores, with a lots of wire wrapped around
> them.

Depends on the frequency!

In microwave it is natural to make PCB trace-transformers, althought they may
not use the term transformer, but coupler. Infact, normal transformers is only
being analyzed by most people for their H-field and not their E-field, causing
much headace where as in couplers both interact throughout.

"1 kHz of sound and 1 GHz in air is about the same wavelength!"

Cheers,
Magnus