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.
This version of the circuit is from 2000, using a source of negative voltage that allows to obtain...
This somewhat complex circuit was found in the May 1984 issue of Radio Electronics magazine. The...
This basic circuit is from an old documentation. The relay must be 50 mA maximum and must have a...