Op Amps: f1 and Sag Time

The lower break frequency, f1, and the sag time of a square wave are closely related, much as the rise time and f2 of an amplifier are related. In this video we examine the process, including some items to watch for making these measurements in lab.
Reference: Operational Amplifiers: Theory and Application, Chapter 5.
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[@andymouse]

This is interesting, I shall muck about with this !.....cheers.