Build Your 10-Band Graphic Equalizer Circuit

Description

The circuit diagram for the graphic equalizer utilizes ten adjustable potentiometers, each influencing a specific range of frequencies. The central frequency of each range is offset by an octave – representing a doubling – from its neighboring frequencies. These units commonly employ similar materials with variations primarily residing in the capacitance values forming the filter within each unit. When the slider controls, RV1 through RV10, are positioned centrally, no filtering intervention occurs within the signal passing through, and the gain of each unit remains at a constant [ X1 ] level. Conversely, if a slider is moved towards the output side, the unit functions as a band-stop filter, attenuating signals within the predefined frequency range. Conversely, when moved towards the input side, the unit operates as a band-pass filter, amplifying signals within the specified frequency range. The quality of all materials, particularly the potentiometers RV1 through RV10 and the capacitors, should be exceptionally high. Specifically, the TL074 integrated circuits, IC1 through IC3, are used extensively within this design. These operational amplifiers are integral to the circuit's filtering and gain control functionality. They provide the amplification and filtering capabilities necessary for the graphic equalizer's operation. The utilization of these ICs enables the precise shaping of the audio spectrum.

Circuit diagram

Part List