AC cord polarity?? Does it matter???????

Am I missing something?

Typically, AC is fed into a components isolation transformer, through full rectification and large filter/storage capacitor networks accross the secondary outputs, thus producing DC voltage. This, intern, feeds all the DC circuits typically isolated from their metal chassis (circuit depedant). Why does it matter which AC polarity feeds the transformer? Isn't DC is the final product?

In Jeff's artical, "all transformers will leak a little current to the component's chassis". Shouldn't it be "leak inductance" or "capacitance"? With lots of chassis made from aluminum, where's the stray field interaction with sensitive circuits, etc.? Most audio components isolate their audio I/O connectors from the chassis, thus minimizing ground loop potential between components with grounded chassis. Any minute stray voltages that do develope along steel chassis, doesn't default into audible subjectiveness.

Any helpfull explanations?

Hsgarch,

Thanks for getting back with me.

Even if the neutral wasn't at zero potential, most domestic voltges provide more than adequate supply for most component DC rails and regulated circuits (+/- 0.5 to 1.0 VAC of the localized incoming supply, which can swing pretty widely throughout the day, and per region).

In most homes, aren't the neutral and "ground" combined within the breaker box? This SHOULD place the N and G at the same potential, thus supplying the proper circuit voltage into the component's isolation x-former.

Now, what happens to so called "leakage inductance" within a non-ferrous chassis (aluminum)? What about components utilizing un-grounded chassis (2-prong cords), or a combination of the two? If none of the component's circuits are electrically grounded to the chassis, what are these stray voltages going to affect? In a ferrous chassis, I can see some 60 Hz magnet issues affecting certain circuits, but not with aluminum. Any minute x-former leakage would stay localized around itself. Right, or what?

I'm just concerned about blanket statements towards these wiring orientation claims, and whether they are indeed audible in most scenarios.

Your responces are always welcome, and I'm not trying to be argumentative. I do have lots of electronic background, but claim to know everything.

Nsgarch,

Thank you for the informative response, and will look into it further. I did find some interesting articles after posting my last response, but still have inquiries pertaining to non-ferrous chassis having the same effect. Lots of veteran electronic engineers at my work, so I'll get to the bottom of this, yet.

Thanks again...