[sdiy] IN your mind, what is ....

[Grant Richter]

> So, has there been a "Norton amp" before the 3900, or was the
> word introduced to describe this chip?
> 

I think the reference is to it's current nature. Voltage analysis of a
circuit is call "Thevenin" equivalent circuits and current analysis is
called "Norton" equivalent circuits.

Takken from "Transform Circuit Analysis for Engineering and Technology" by
William D. Stanley. A good book an the Laplace transform.