Re: Dr Howard Johnson, this weeks guest on The Amp Hour

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#357

From: Phil Hobbs
Date: Tue, 10 Jan 2012 17:09

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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-wizardry/
>
> 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 at 
http://www.sigcon.com/Pubs/news/8_08.htm for 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

-- 
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

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