The following images is the schematic diagram and PCB layout of 7W stereo audio amplifier, build based LM4756. It means that the output of this stereo amplifier will be 2x7W maximum.
Schematic diagram:
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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.