This control for bass, midrange, and treble was found in the March 1995 issue of Electronics Now magazine. The circuit requires a dual power supply.
The frequency depends on C, which must have the indicated value ratio, and also on R, which can be...
Toshiba MOSV MOSFETs These and others from the same line of Toshiba power MOSFETs are available from...
This circuit was suggested by Electronic Engineering in a 1980s publication. The circuit makes use...