This circuit was found in the March 1995 issue of Electronics Now magazine. The circuit requires a symmetrical power supply, and the FET is a common general-purpose type.
This circuit, for frequencies up to 100 kHz, was found in American documentation from 1970. The...
This circuit was found in an English magazine Radio & Electronics Constructor of February 1977....
The integrated circuit used is no longer common today. The circuit is from Motorola's 1990 Linear...