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In Reply to: RE: Is it beneficial to connect xformers to chassis? posted by ckniker on May 22, 2009 at 06:21:26
I have done non-extensive testing of a whopping 5 types of transformers, so my experience is most limited. I have noticed, in some xfmrs, that the high frequency behavior is affected by the grounding of the core with grounded source and/or load. I assume this has to do with the stray capacitance of any particular winding to said core.
The Lundahls I have found to be particular with core grounding; that is, they preferred to have their cores grounded. With the complex winding arrangements, it pays to experiment with the connections to optimize the low, mid, and high frequency behavior. Just my $0.02. I use the LL1689AM/PP, as well as LL1692A, and believe this to be reliable advice. Experiment! Once you find the optimal winding arrangement, nothing beats a Lundahl.
That being said, I think it foolish to not ground the cores of mains transformers and PS chokes, for safety. You can still mount everything to the wood chassis (that's what I do), but I also use conductive adhesive foil tape a la McMaster Carr to bond the core to the chassis ground. Works great, and you can keep the benefit of wood mounting.
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