[sdiy] equations up

[metasonix at earthlink.net]

Ian Fritz wrote:
> OK, show us your space-charge calculations. We know you have 'em.  :-)

Actually it seems that the 3/2 power law (usually called the
Langmuir or perveance law) may be incomplete. I know a
very smart guy who is writing SPICE models for triodes, and he
claims that you need a whole Taylor series of terms to cover
even the simplest triode. There are drift effects, electron
interactions, fringing effects, etc....

But of course people are arguing about this, most physicists
regard Langmuir as a god, and the 3/2 equation gets you within 1% in
nearly all cases; and I hate it when smart guys squabble over arcane
physical rules, so I won't bring it up anymore. Boring.