This circuit was found in an American publication from 1965. The circuit uses components from that time. No information was given about the excitation transformer. Observe the high input power.
This circuit appears in other articles and suggestions for circuits in this section from other...
This tone control was obtained in a Signetics documentation of the 90s. The integrated circuit can be...
We found this circuit in an American publication from the 1990s. Any FET can be used. The circuit...