AW: "gndloops" and Maxwell

[Martin Czech]

> 	>Example: Normal power chord (distance of conductors 10mm) @ 1.0 A
> peak
> 	>current, 50 Hz.  maximum field at a distance of 1m is: 2nT.
> [...]
> 	> This
> 	>example shows, that the internal error currents are much more
> important
> 	>than external induced currents via E=-d/dt PHI. 
> 
> Mains transformers.
> 
If you have strong mains trafo stray fields, you're finished. Better
keep these iron blocks away in a special housing. Many people complain
about wall-warts.  They may fall down, get lost etc. etc. But they have
also advantages. Almost no stray field due to distance. Good audio
stuff has the mains transformer somewhere external, or mu shielding and
torroid trafo or something like that. This way, the stray field 
can be kept very small, but of course a mu cap is expensive, i don't even
know where to get these speciall components. For the diyer, it is perhaps
the best to use wall-warts, or external mains trafo and the like.

m.c.