This article describes the hardware design of four-channel amplifier (BioAmp) for human neurophysiologic electrical activity measurement. Variable combination of leads is possible depending on the measurement type and characteristics thereof. Gain of individual leads is adjustable via digital potentiometers. It is possible to measure various types of biological signals such as ECG, EEG and EOG. The application of simple braincomputer interface (BCI) using BioAmp device is presented in the

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... The noninvasive Steady State Visual Evoked Potential (SSVEP) method is used for this purpose.