In message 
<[email protected]>, dated 
Wed, 29 Sep 2010, "Oglesbee, Robert A" <[email protected]> writes:

>How the transformer is wound also makes a big difference.

... because it affects the values of the impedances from each end of the 
secondary winding to any reference point.

This effect MAY be minimised by the grounding of the centre-tap of the 
secondary winding - if it REALLY is exactly in the centre. Otherwise, it 
may make things worse.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
If at first you don't succeed, delegate.
But I support unbloated email http://www.asciiribbon.org/

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