This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating amplifiers with the same characteristics and the power supply must be symmetrical.
This circuit for experimental radios and other applications is from a documentation from the 50's....
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...
This configuration was found in a 1970s American magazine. The circuit uses both CMOS logic and...