Performance 7Band Sound Equalizer with Headset Compatibility and Precision Control This advanced audio equalizer is engineered for users who demand precise control over their sound, whether for professional audio applications, home entertainment systems, or quality listening. Built with robust components and carefully designed circuits, it offers exceptional performance and flexibility. Key Features and Benefits: 3.5mm Interface for Headset with Microphone Supports a 4pole plug input, enabling connection to headsets equipped with a microphone. Ideal for conducting voice calls directly from a mobile phone while maintaining audio quality. Includes an additional terminal interface for added connectivity options. Comprehensive 7Band Equalization Provides a wide control range of ±12dB across seven distinct frequency bands for detailed sound shaping: 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, and 15KHz. Built using TI or TL074 components for precise and stable audio adjustments. Quality Preamplifier Performance Features a 4580 classic operational amplifier delivering 5X amplification (14dB gain), ensuring rich, dynamic sound output. The input impedance is 20K for signal handling, while the 600ohm output impedance supports consistent performance across connected devices. Balanced Earphone Amplifier Incorporates the NE5532 in a balanced earphone amplifier configuration with a 47 earphone driver circuit, making it capable of driving a wide range of headphones effortlessly. Includes adjustable output height to match various headphone specifications for listening comfort and sound quality. Practical Applications: 1. Professional Audio Workstations for musicians, sound engineers, and producers who require detailed tone shaping and balanced output for studio monitoring and mixing. 2. Home Entertainment Systems Delivers enhanced sound clarity and balanced frequency output for TVs, music systems, and gaming setups, giving users complete control over tonal adjustments. 3. Mobile Communication with Quality Audio Allows users to make and receive calls using a headset with microphone, maintaining audio fidelity during voice communication. Specifications at a Glance: Input Interface: 3.5mm, 4pole plug support Equalization Bands: 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz Equalization Range: ±12dB Preamplifier Gain: 14dB (5X amplification) Input Impedance: 20K ohms Output Impedance: 600 ohms Core Components: TI or TL074, 4580 opamp, NE5532 amplifier Headphone Driver Circuit: 47 earphone driver with adjustable output height This unit combines professionalgrade audio engineering with userfriendly connectivity, making it a versatile tool for anyone who values precision sound control and reliable headset compatibility.