To enable bass boost connect ‘ubb’ to positive supply. I design this circuit for electronic switching. U1A and U1D are act as mixer, U1B and U1C for the base boosting. This circuit is not only a bass booster it also include a simple mixer circuit.
Alternatively, you can use any general-purpose op amp such as LM324, TL084, etc. This circuit is an active circuit and used TL074, which include separate four op-amps.
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