Active Tone Control Circuit Electronic.
This circuit does not use a potentiometer so that the output audio signal can not be controlled. S1 is used as an option if the circuit is enabled or disabled (bypass).
This circuit works with 12V DC power supply. Above circuit used to be a single channel, for stereo application you need two identical circuit, parallel the supply, and use DPDT switch.
This schematic diagram come from circuit: ACTOR : Active Tone Control
Go to that page to read the explanation about above circuit design.
In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.
In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.