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In the Forum: Melquiades Amplifier
In the Thread: Bias help

Post Subject: Magnetics and suchPosted by N-set on: 3/20/2011

I think you did not understand what I mean. Also, there was a subtle word "implicite"
in my statement which makes a difference here.
Closed magnetic loops: I did not mean the cores of magnetics, but the
geometry of the shields. To catch the magnetic flux
escaping the core and constraint it, a closed loop around the
shielded element is needed. Magnetic field is source-less. In propagates in closed
loops. A box, shielding from all directions (4pi solid angle) is great. If there is no chance for a box,
make at least a loop. Why your SU-2 are multiple boxed? Because shields
also saturate, just like cores, and loose efficiency. So double boxing both sensitive and
strongly poluting elements is a good idea. In this case it would be
putting potted elements in one more boxes and signals OUTSIDE those boxe.
I see absolutely no controversy here.
This is a standard knowledge and practice. Steel is not the only material of course,
one can use aluminium but it saturates much faster so it must be much thicker.

Toroids: I've never used them too much, but one of the standard facts is that such cores
emit much less than other types, esp. EI.

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