3 band equalizer

Posted on Feb 7, 2014

This is a simple 3 band graphic equalizer circuit that`s built by a single op amp IC LF351 IC and few passive components. The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the performance. This is feature make it easy to be assembled from your junk box. This is a figure of the

3 band equalizer
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circuit; How is the simple 3 band graphic equalizer work The op amp LF351 is wired to operate in three frequency ranges-high, medium and low. The circuit is designed such that the circuit produces +/-20 dB boost or attenuation for 50Hz, 1KHz and 10Khz by varying POT`s R3, R6 and R9. The maximum amplification for any of these bands at maximum supply voltage is 20dB. The op amp LF 351 is wired as an inverting amplifier whose response to frequencies 50Hz, 1Khz and 10KHz can be varied by adjusting POT`s R3, R6 and R9.

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