On Saturday 14 July 2018 11:57:10 Jon Elson wrote: > On 07/14/2018 02:37 AM, Gene Heskett wrote: > > Not exactly 100% correct John. High frequencies are > > generally carried only by current flow at the skin of a > > conductor. And the large conductor, while having some rise > > in impedance, is still the better conductor because the > > smaller wire has far less surface skin area, raising both > > its impedance and its ohmic effects faster than the big wire. > > There's also loops. Bundling the power supply and ground > return close together minimizes inductance. Having the > supply and return form a big loop increases inductance, and > can cause greater noise as well as radiation of EMI. So, in > general, you want the return wires to follow the supply > wires closely. > > Jon > Preferably as a twisted pair so the radiation of noise largely cancels at 2x the twist rate distance or more. A tight twist = less radiated noise.
-- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
