In addition to tone control, this circuit of the SGS 1982 linear integrated circuit manual has a loudness control. The supply must be made with a 24V voltage source.
This circuit was suggested by General Electric in a 1965 documentation. The circuit can be...
This circuit of an Electronics Now from the 90's produces an intelligent direction signal that has...
This simple amplifier stage with a transistor has a linear response from 25 Hz to 120 kHz. The...