[sdiy] Equation question

[Scott Nordlund]

> It's actually pretty hard to fry an opamp, short of actually switching the
> power pins, so you are probably safe there.  However, you really should be
> calculating these things.  Provided you don't care about biases, offsets,
> bandwidth, etc. (which you hardly ever have to), opamps are the easiest
> things in the world to predict.  Two simple rules:
> 
> 1.  The input pins admit no current.
> 2.  The input pins share the same voltage.

Well, not to be pedantic, but this is also assuming negative feedback and 
no clipping or slewing.  And these conditions are not met frequently enough
that they should be kept in mind as well.

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