Tactical Neuro-Interface (TNI) EEG System 📌 Project Overview This repository contains the technical specifications, schematics, and firmware for the Tactical Neuro-Interface (TNI), a high-integrity 21-30 channel EEG data acquisition system. Unlike standard clinical EEG devices, the TNI is designed for integration into ruggedized, tactical form factors to monitor operator cognitive load, stress levels, and neural response times in high-stakes environments. ⚙️ Technical Architecture The system follows a high-precision analog-to-digital signal path optimized for microvolt-level biological signals. Signal Chain Schematic Input: Scalp Electrodes (21-30 channels) via Shielded multi-wire cable. Primary Stage: Pre-Amp (AD620) | Gain: 100x | CMRR: >100dB. Filtration: Bandpass Filter (HP: 0.5Hz, LP: 70Hz) + Notch (50/60Hz rejection). Secondary Stage: Post-Amp + Clamper | Gain: 10x | Bias: 0-5V. Digitalization: ADC (12-24 bit) | Sample Rate: 256 Hz. Processing: MCU/DSP (ARM/PIC) | Real-time Artifact Detection & Event Logging. Storage: On-board SD Card (24-72 hr capacity) powered by Li-Ion Battery. 🛠 Hardware Specifications Instrumentation Amp: AD620 for high-precision, low-noise amplification. Processing Unit: ARM-based DSP core for real-time Fourier transforms and eye-blink artifact filtering. Isolation: Galvanic isolation between the user interface and the power source for safety.