The filter presented is from 1994 but can be implemented with a more modern equivalent. We found this setting in the National Semiconductor Linear Applications Handbook.
This transistor circuit was found in Mullard's 1960s transistor manual. The transistors are...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This high impedance amplifier is from 1985 documentation by General Electronic. The amplifier with...