3 Band graphic equalizer circuit

Posted on Feb 6, 2014

Here is the circuit diagram of a simple 3 band graphic equalizer circuit using a single IC and few components. The IC used here is LF 351 which is a wide bandwidth single JFET operational amplifier. The high input impedance of the IC makes this circuit compatible with most of the audio signal sources. The opamp is wired as an inverting amplifier.

3 Band graphic equalizer circuit
Click here to download the full size of the above Circuit.

The input signal is fed to the inverting input of the opamp via the filter network. The filter network can produce a +/- 20 dB enhancement or cut on the three frequency bands 50Hz, 1KHz and 10KHz. POTs R1, R2 and R3 can be used for adjusting the gain of the different bands.

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