7Band Audio Equalizer with Headphone Amplifier Experience precise audio tuning and professionalgrade sound optimization with this 7band equalizer and headphone amplifier, designed for control, compatibility, and performance in both and professional audio setups. Key Features: **Accurate Tone Control**: Offers 7band equalization with ±12dB control range for accurate sound shaping. Frequency bands include 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6.5kHz, and 15kHz, built with TI or ST original TL074 components for dependable performance. **Enhanced Signal Amplification**: Integrated preamplifier using the classic 4580 op amp delivers 5x gain (14dB) for clear, powerful sound output. Input impedance is 20K, output impedance is 600 ohms, ensuring signal integrity. **Quality Headphone Drive**: NE5532based ear amplifier and type 47 headphone driver circuit provide robust driving capability for all headphone types, with adjustable and low tone. for both casual listening and studio monitoring. **Versatile Connectivity**: 3.5mm input interface supports 4pole plugs, making it compatible with headsets that include a microphone. Output allows direct connection to headphones with a microphone for normal mobile phone voice calls. Additional terminal includes a standard RCA (lotus) interface for integration with other audio equipment. Practical Applications: 1. **Home Audio Enhancement**: Improve music playback quality on your hifi system by finetuning specific frequency ranges for your room acoustics. 2. **Professional Audio Work**: Use in studio environments for precise tone shaping during mixing, recording, or editing, ensuring every detail is optimized. 3. **Mobile and Portable Use**: Connect to smartphones or portable music players via the 3.5mm 4pole jack for enhanced listening and clear voice calls without sacrificing audio quality. This 7band equalizer combines fine frequency control, strong amplification, and broad compatibility, making it an ideal solution for audiophiles, sound engineers, and casual listeners seeking improved audio performance in any setup.