Performance Earphone Amplifier with 7Band Equalizer and 3.5mm Interface Experience precise audio control and powerful amplification with this advanced earphone amplifier, designed to deliver exceptional sound quality and versatility. Key Features: Balanced Earphone Amplification: Utilizes the NE5532 as the balanced earphone amplifier in the 47 earphone driver circuit for consistent, quality audio output. Capable of driving a wide range of earphones with adjustable height settings for fit and comfort. Sound Control: Builtin 7band sound equalizer for finetuning across multiple frequencies. Adjustable range of ±12dB to match listening preferences or specific audio environments. Powerful Preamplifier Gain: Equipped with the 4580 classic operational amplifier delivering 5X amplification (14dB gain), adding clarity and punch to your audio. Audio Impedance: Input impedance at 20K ensures clean signal reception; output impedance of 600 Ω provides stable, consistent power to connected devices. Versatile 3.5mm Interface: Supports 4pole plugs for full headset compatibility, including models with integrated microphones. Allows seamless connection for normal voice calls on mobile phones. Additional terminal interface provided for enhanced connectivity. Precision Equalization Band Frequencies: Adjustable bands at 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, and 15KHz, ensuring accurate sound shaping. Built with TI or TL074 for reliable, performance equalization. Applications: 1. Mobile Communication: Connect your headset with microphone to enjoy crystalclear calls directly from your mobile device. 2. Studio and Home Audio: Finetune and amplify sound for mixing, mastering, or listening with precise control over all relevant audio bands. 3. Gaming and Multimedia: Achieve immersive sound with customized equalization for gaming, movies, and music playback. This amplifier is engineered to offer both sound enhancement and flexibility, making it ideal for professionals, hobbyists, and everyday users seeking audio performance.