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.
Found in an English publication from 1967, this circuit generates 5 kHz signals with harmonics that...
This preamplifier circuit for turntable cartridges was found in the March 1994 issue of...
This circuit is from documentation from the 80s, so it makes use of an operational amplifier that...