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Re: Confused

What you say about the internal transformer is only partial correct.
If it was a "perfect transformer" like those tault at college then you are correct. BUT in the REAL world with real components nothing is that simple. firstly there will be a coupling between the primary and seconday windings caused by the phyical spacing between them. ie they are capacitivly coupled, this will let through noise.
secondly the transformer core dependant on its material constuction, will also allow non 50/60Hz frequency coupling.
thirdly any RF on the line will travel on the outer surface of any metal, it can jump across the transformer and capactivly couple itself to the equipments DC line without too much problem.

Since most equipment manufacurer dont "design their" equipment to any great degree of noise immunity or rejection (those that do produce broadcast quality suff at a large price multiplier), we are left with a far less than perfect ("it will do @ that price") level of equipment.
Hence we are left to the snake oil saleman, and the genuine engineer/designer, and ferrite rings, JR & CVH and others to try and solve the problems. This is one of the reason that so much discussion goes on about mains, and cables in general. The others are lack of indepth knowledge, arrogance, ignorance, pride, prejudice, stupiity or any of the other deadly sins.
Incidently the platting of any wire is known to reduce the noise level of a signal on it. Kimber and others have made a lot of money out of this known fact. and not a serpent in sight.




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  • Re: Confused - chris_w 07:56:06 09/27/03 (0)


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