The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is Baxandall type. The integrated circuit used is not common today.
This signal generator found in Japanese documentation of 1973 uses an unusual integrated circuit...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
We found this circuit in an old European publication. Integrated circuits are not common today and the...