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The below diagram is a circuit diagram of stereo tone control which also on the market in kit, you could possibly look for the kit at electronic part shop near your home. The tone control need 12 volt of supply voltage to work.

The circuit build according to common tone control circuit, by applying two transistors FCS9014 in each channel, so there’re four transistors for this 12v stereo tone control.

Here is the circuit diagram of audio amplifier which able to deliver 60W power audio output. Sanyo Integrated Circuit STK-0060II is used as primary component.

The circuit has single input and single output (mono). You must build the similar circuit to get stereo output.

Do you want to build a tone control circuit is simple, inexpensive and easy to make ..? if so, this circuit could be right for your project.

Circuit Description:
The LM1036 works as a DC controlled tone (bass/treble), volume and balance circuit for stereo audio system purposes in car radio, Tv as well as audio devices. An extra control input will allow loudness compensation to become simply effected. Four control inputs provide control of the bass, treble, balance and volume capabilities via application of DC voltages from a remote control system or, additionally, from four potentiometers which might be biased from a zener regulated supply provided on the circuit. Every tone response is defined by a single capacitor selected to give the preferred characteristic.