Octave Equalizer Circuit

  
This circuit is one section of an octave equalizer used in audio systems. The table shows the values of CI and C2 that are needed to achieve the given center frequencies. This circuit is capable of 12 dB boost or cut, as determined by the position of R2. Because of the low input bias current of the OP-08, the resistors could be scaled up by a factor of 10, and thereby reduce the values of CI and C2 at the low-frequency end.
Octave Equalizer Circuit - schematic

In addition, 10 sections will only draw a combined supply current of 6 mA maximum.




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