Tone-control audio amplifier

  
The circuit makes excellent use of the high slew rate, wide bandwidth, high input impedance, and high-output voltage capability of the CA3140 BiMOS op amp. The wideband gain of this circuit is equal to the ultimate boost or cut plus one, in this case a gain of eleven.
Tone-control audio amplifier  - schematic

For 20-dB boost or cut, input loading is essentially equal to the resistance from terminal 3 to ground.




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