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Re: Any scientific explanation for bypassing other caps? Sorry for crossposting...

Posted by jneutron (A) on October 27, 2003 at 21:54:51

In Reply to: Re: Any scientific explanation for bypassing other caps? Sorry for crossposting... posted by biggerdog on October 23, 2003 at 06:59:15:

Biggerdog: ""From this you get significant inductance, as zanash mentioned, which tends to resist rapid charge and discharge.""

John: I didn't see where he mentioned significant inductance. I tend to agree, though..

Two points: first, if the foils are connected to at the same place, then wrapped, the currents in one sheet will go opposite the other, creating a bifilar style low inductance geometry, this would happen if both leads are connected in the center of the paper towel arrangement, or both on the outside end of the foild.. If the foils are arranged such that the currents in the sheets follow the same direction, then they will produce lots of inductance, and some major skin effects..this would be caused by one foil being connected in the middle of the tube, and one on the outside.

Because of the possibly huge width of the foils, indicated by the axial length of the foil cap...an inductive connection would skin heavily with frequency, causing the current to skin to the ends of the cap, with a "used area" based reduction in capacitive reactance.

I can't for the life of me think of why someone would use the inductive option, it's so bad..

The larger the capacitor is, the larger the loop inductance will be, the smaller caps suffer this less..

Cheers, John

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