tony duell wrote: > Another of Don Vonada's laws is 'There is no such > thing as ground'.
My father is a civil engineer. When I was a little kid, he was in the US Air Force. We would frequently go to the runway snack bar, get ice cream and watch the B-52s do "touch-and-go" landing practice. The plane's wings would "flap". It raised the hair on the back of my neck. My dad explained that, if they didn't flex, the wings would break off. After a while, I understood, intellectually. It still "gave me the willies". Later I had a similar experience when I was with him in a tall building and realized that it was "waving in the wind". Same thing, if it didn't flex, it would fall. > The other is that, as I said before, any ground > connection has impedance (it's the inductance that > is troublesome normally) so that points (say IC pins) > that are shown as grounded may actually have a > voltage difference between them. If I think about it too much, this gives me the willies, the same way. Bill S.
