Engineering and math

But they used rules of thumb and experience, not math. And too many times they fell down. It's a wonder that so many survived.

The ark was built by talented and knowledgable amateurs.

The Titanic was built using the best engineering practice and calculations of the day.

Jim

With bulkheads with no ceilings.

And sunk by a cowboy intent on setting a speed record ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

Yup. CAD has nothing on a swizzle stick dipped in soy sauce and a clean napkin.

Jim

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

That's what I like about Macaroni Grill, table "cloth" is a sheet of white butcher paper... surprises the hell out of them when I roll it up and take it with me, sauce stains and all ;-)

...Jim Thompson

Hi Homer Jay Simpson!

The secondary modern school I have visited, is a Building from ~1789. Big broad stone-stairs, chiselled/worn out in the middle. There are older around, too.....

Today they build Container, Fully glassed , even the sport-hall, with iron-grid cheapo Stairrs. (What a ladder... ;-()

Best Regards,

Daniel Mandic

The story of the Ark was copied from Gilgamesh. There's no suggestion it was true.

I doubt that John will respond, each component that has a reasonable time domain description has a reasonable frequency domain description. Simply start with the frequency domain descriptions and solve the circuit. I found the math real twisty the first few times, then i got the hang of it.

Well, there's not much more to say. My position is that I use no transform mathematics when I do a Bode plot to design or analyze closed-loop stability; often I do it all in my head and on a scrap of quadrille paper, without even using a calculator, sometimes without even the paper. Jens thinks that the existance of the Fourier transform somehow makes it possible for me to do this.

Matter of opinion.

John

I use (if I'm feeling guilty) a spreadsheet to generate simple tables so I can confirm my designs for linear systems, usually power supply loops.

Regardless of the common wisdom, I make sure they don't phase reverse across the _entire_ gain range (rather than merely at unity gain) and I haven't used anything more esoteric than a gloroified simple calculator (toughest computation -> reciprocal).

I'll note I've done a lot of those designs and they have all worked flawlessly. There are times for full analysis using transforms, but I haven't needed it for linear feedback loops.

Cheers

PeteS

IIRC, Excel includes a version of TK!Solver so it should be fine for this.