7Band Sound Equalizer with Integrated Headphone Amplifier Key Features and Benefits: • Precise 7band frequency control with ±12dB adjustment range, allowing accurate audio tuning for listening experience. • Equalization bands: 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6.5kHz, and 15kHz, powered by TI or TL074 components for stable and reliable performance. • Builtin NE5532 balanced headphone amplifier designed on the 47 headphone driver circuit, capable of driving a wide variety of headphones with adjustable gain to suit preference. • 3.5mm input interface supports 4plug connections for seamless integration with headsets featuring microphones. Compatible with mobile phones for clear voice calls, ensuring convenience for communication and entertainment. • Additional terminal interface provides expanded connectivity options for different audio setups. • 4580 classic operational amplifier delivers 5x gain (14dB) for rich, dynamic sound reproduction. • Input impedance: 20kΩ for signal acceptance; output impedance: 600Ω for clean and consistent audio delivery. Practical Applications: 1. Ideal for home audio enthusiasts who want precise control over sound frequencies to match room acoustics and taste. 2. Suitable for musicians and recording engineers needing accurate equalization to shape audio in live mixing or studio recording environments. 3. for mobile users seeking an enhanced listening experience along with reliable headset microphone functionality for calls and gaming. Performance and Compatibility: This equalizer system combines professionalgrade components with a userfriendly interface to deliver clear, sound. With its performance headphone amplifier and versatile frequency control, it works seamlessly with a wide range of headphones and audio devices. The 3.5mm and terminal connections ensure compatibility with modern and traditional setups, making it a flexible choice for both leisure listening and professional audio work.