Build Your Perfect Parametric Mid-Range Equalizer Circuit

Description

This circuit represents an extension of the Mic-Line balance configuration, yet it’s adaptable to virtually any audio system. It’s comprised of two distinct sections: A) a conventional bass/treble unit, and B) a parametric unit for mid frequencies. Both sections may also be utilized individually or together, incorporating the necessary buffering components from preceding and subsequent circuits. The R2 component controls high-frequency response, allowing for adjustments of +/- 18 dB/oct at 20 kHz. The R5 element regulates low-frequency response, providing +/- 18 dB/oct adjustments at 20 kHz. The R11 element shapes the mid-frequency response, offering +/- 15 dB/oct variations, while the R10 component establishes the center mid-frequency point, operating within a 200 Hz to 6 kHz band.

Circuit diagram

Part list

Integrated Circuit Description

The NE 5532 is a dual operational amplifier, commonly utilized for its high performance and versatility. This integrated circuit offers excellent common-mode rejection ratio and slew rate, making it suitable for a wide range of audio amplification and signal conditioning applications. It’s a popular choice in audio circuits due to its low noise characteristics and ability to drive both low-impedance and high-impedance loads effectively. The NE 5532 is known for its robustness and reliability, ensuring stable operation even under demanding conditions. It's frequently employed in gain stages, filters, and other circuits where precise amplification and signal manipulation are required. This component's specifications include a typical supply voltage of ±15V, a single supply version also available, a bandwidth of 200 kHz, and a slew rate of 1 V/µs. This IC is a critical component for audio applications requiring accurate amplification and signal processing capabilities.