This is my DIY EEG project, built using the AD627B instrumentation amplifier and TL084CN op-amp to capture brainwave signals. The circuit is designed to amplify weak scalp-level voltages and filter out common noise, including 60 Hz powerline interference.
📸 Photos
Two electrodes placed on the Fp1 and Fp2 to track general attention/focus.
Fun fact theres are actually electro cardiagram pads from when I went to the hospital for Rhabdo!
EEG amplifier circuit based on AD627B and TL084CN
Captured alpha wave signal shown on oscilloscope
🎥 Demo Video
🧠 Features
- AD627B instrumentation amplifier for clean differential input
- TL084CN quad op-amp used for high-pass, low-pass, and notch filters
- Signal observable on oscilloscope or digitized via ADC
🔗 Source Files
You can find the full schematic, SPICE simulation files, and build guide here:
GitHub Repo