This tone control was obtained in a Signetics documentation of the 90s. The integrated circuit can be practically any operational amplifier. The power supply is symmetrical.
We found this circuit in the February 1987 issue of Radio Electronics magazine. It is based on an...
This circuit is from an Argentine publication from the 1970s but can still be assembled with...
We found this circuit in a publication from the 90's. The circuit is used with sinusoidal...