All our research and attempts began 2 years ago. We wanted developed devices as quickly as possible. All devices in the photos lower correctly operated.
This first version of the active electrode, pic.1.
Active electrodes are promising directions. We plan to return to this direction.
2. EEG device on the simple board
After that, a board was assembled for measuring EEG with only one electrode.
3. PCB board, version 1.0
In the next step, we did the device on the PCB board for 8 channels. Better, but the size was too big – not so comfortable.