[sdiy] Equation question

[Magnus Danielson]

David G. Dixon wrote:
>> Well, not to be pedantic
> 
> Then DON'T BE!!   ;->  (did you notice the winking emoticon?)
> 
> But seriously, folks, let's not throw out the baby before the bathwater's
> even cold!  There's plenty of time to learn to appreciate the finer points
> of opamps, once the basic "golden rules" have been thoroughly assimilated
> and internalized.  90% of everything anyone needs to know about opamps is
> encapsulated in the golden rules.
> 
> Just for fun, I'll repeat them:
> 
> 1.  the input pins admit no current
> 2.  the input pins share the same voltage

For simple schoolbook analysis it is enought. Most designs we meet is 
designed according to such rules, despite the fact that they do not 
include numerous imperfections. Once you can solve problems like that, 
add imperfections one at a time. Many times the schoolbook approach is 
enought to get a feel. Only rarely has a designer been very carefull to 
handle imperfections. rBE-compensation springs to mind.

Cheers,
Magnus