Abstract- This paper describes the development of an electroencephalograph (EEG device) with portable application possibilities. The hardware design is based on the Modular EEG possibilities. The developed firmware detect the alpha brainwave without using any computer (PC). It uses signal correlation and windowing technique to detect the alpha frequency band. The same technique is used to detect the 50 Hz artifact concurrently. This artifact together with the average of the signal used to disable the alpha detection output to reduce false-positive results. The device can also deliver than plain digitized EEG signal to a PC using the Modular EEG packet form version