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Article #355Re: Dr Howard Johnson, this weeks guest on The Amp Hour
From: John Larkin
Date: Tue, 10 Jan 2012 16:50
Date: Tue, 10 Jan 2012 16:50
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3075 bytes
On Tue, 10 Jan 2012 17:29:35 +0100, Jeroen Belleman <jeroen@nospam.please> wrote: >John Larkin wrote: >> On Tue, 10 Jan 2012 01:28:22 -0800 (PST), Bill Sloman >> <bill.sloman@ieee.org> wrote: >> >>> On Jan 10, 7:47 am, "David L. Jones" <altz...@gmail.com> wrote: >>>> Just thought some might be interested in hearing our recent guest on >>>> our Amp Hour radio show, Dr Howard Johnson of "Handbook of Black >>>> Magic" fame[...] >> >> Yeah, his book is half nonsense. If you can tell which half is which, >> you don't need the book. His ideas on "return currents" and bypassing >> are absurd. And the writing is dreadful. > >I haven't got the book handy, but I'll pick it up tomorrow or so. >Do you mind expounding on why his "return currents" make no sense? >Did he mean something different from image currents? He says that a transmission-line pcb trace must always be "referenced" to the same "return current" plane it started with and shouldn't pass through vias to become referenced to a different plane, or else the return currents will get confused or go on strike or something. If that were true, 98% or the multilayer boards on Earth would quit working. He also says that you should add bypass caps and stitching vias to conduct these return currents whenever a trace does via to a different "reference plane." All silly. John
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From: John Larkin <jjlarkin@highNOTlandTHIStechnologyPART.com>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Dr Howard Johnson, this weeks guest on The Amp Hour
Date: Tue, 10 Jan 2012 08:50:24 -0800
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