Found in Analog Devices documentation, this circuit is used in measurement bridges to linearize the signals when approaching equilibrium. Formulas are given next to the diagram.
This is perhaps the first PIC project to appear in a publication. The article is from Radio...
From a 90s Popular Electronics, this circuit emits pulsating signals for different types of...
This circuit for effects on music synthesizers was found in the May 1983 issue of Radio...