Obtained from an Electronic Engineering of the 90s, these circuits can be applied to almost any operational amplifier. Signal shapes are given next to the diagram.
This circuit was found in an English publication from 1989, but it can be easily assembled, as the...
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...
This circuit was found in an American documentation from the 90s. It consists of an optical memory...