Build Your Own 6-Band Graphic Equalizer Circuit

Description

The EQ-2 represents a six-band graphic equalizer circuit. Each frequency band is controlled by potentiometers RV1 through RV6, serving as visual indicators of the adjustments. It’s important to note that these potentiometers can be readily replaced with alternative potentiometers. At the center of each control potentiometer, the gain is set to zero (flat). However, at the terminal connections, an additional gain of +/- 15 dB is available, allowing for boosting or cutting frequencies, respectively. For stereo operation, the circuit is designed to be duplicated twice.

Integrated Circuit IC1 – TL074

The TL074 is a versatile operational amplifier (op-amp) IC, commonly utilized in analog circuit design. It’s a low-noise, JFET-input op-amp, known for its high performance and wide bandwidth. This particular IC provides the amplification necessary for the EQ-2's frequency control. It typically consists of four independent op-amps within a single package, offering flexibility in circuit design. It's a popular choice for audio applications due to its robustness and good signal-to-noise ratio. It is supplied in a 8-pin DIP package.

Circuit diagram

Part list

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**Security Warning:** Handle electronic components with care. Improper handling may result in injury or damage to equipment. Always disconnect power before working on circuits. This circuit diagram is for informational purposes only. The user assumes all responsibility for its implementation and operation.