🚀 go-pugleaf

On 01/10/2012 09:27 PM, George Herold wrote:
> On Jan 10, 12:09 pm, Phil Hobbs
> <pcdhSpamMeSensel...@electrooptical.net>  wrote:
>> On 01/10/2012 01:47 AM, David L. Jones 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:
>>> http://www.theamphour.com/2012/01/10/the-amp-hour-77-winsome-waveform...
>>
>>> Lots of history of the book, signal integrity, Gigabit Ethernet
>>> development, 90 degree PCB bends, audiophoolery, and a whole bunch of
>>> other talk over almost 1 1/12 hours.
>>
>>> Dave.
>>
>> HJ has a mixture of good stuff and complete nonsense.
>>
>> I hope you grilled him a bit about his less sensible stuff, like that
>> hilariously erroneous video where he attempts to use electrostatics to
>> demonstrate that ground currents want to flow under traces.  Of course,
>> the impedance levels are millions of times too high for inductance to be
>> a factor in that demo, but never mind.    Have a look athttp://www.sigcon.com/Pubs/news/8_08.htmfor the whole ridiculous thing.
>>
>> (The current path is determined by corona discharge at the sharp corners
>> of the metal squares--if you look at all closely, you'll see that the
>> discharges always want to go out the corners of the squares.)
>>
>> Cheers
>>
>> Phil Hobbs

>
> That is pretty silly.
> But certainly it's a good idea to keep a nice unbroken ground plane
> under the signal(s) that you really care about.
>
> George H.

I don't disagree with you there.  But I have small respect for someone 
who makes his living peddling that sort of cargo-cult stuff.  If he ever 
corrected himself, or offered actual real-world data or simulations, I'd 
pay attention.  As it is, his stuff is like an old time medicine 
show--the willow bark tea works, the snake oil doesn't, no apparent 
effort is expended to sort them out.

Remember the little boy in the story:  "Why do you keep snapping your 
fingers, Bobby?" "To keep polar bears away."  "But there isn't a polar 
bear within 2000 miles of here!"  "Works great, doesn't it?"

Read Morrison instead.

Cheers

Phil Hobbs

-- 
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net