How to make turbo bass for amplifier?

How to make turbo bass for the amplifier:

This is a turbo bass circuit diagram. when we make the amplifier we need this circuit diagram to make the turbo bass system. this is the circuit diagram.

we have to use 9-12 voltage for this circuit. and also need center tap voltage. all component is written down in this circuit diagram. if any questions.

The backside of this circuit 

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