Electronics for the beginner (with the physics teacher in mind). The operational amplifier: Part 1

This is the third of a series of articles covering electronics material which is common to A-level physics syllabuses offered by the various examination boards. The articles are aimed at teachers who are not familiar with this area of study. The first two articles dealt with elementary Boolean algebra and logic gates. Copies of these may be obtained from the editor of Electronic Systems News. This third article is written as an introduction to the operational amplifier. Two further articles will study operational amplifier circuits and applications.