The integrated circuit used in this application is uncommon, but equivalent operational ones can be used. The circuit is from the Signetics integrated circuits manual from 1972.
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...