We found this circuit in the April 1979 Radio Electronics magazine. Note the filter capacitor bank that can now be replaced by a single equivalent value capacitor.
This circuit, which only works with incandescent lamps, was obtained in an American documentation from...
This equalizer has automatic level control, being designed by Sanyo for cassette recorders and...
The integrated circuit used in this 90's application is no longer easy to obtain today. The...