[en] This paper deals with internally generated noise of bio electric amplifiers that are usually used for processing of bio electric events. The main purpose of this paper is to present a procedure for analysis of the effects in internal noise generated by the active circuits and to evaluate the output noise of the author's new designed bio electric amp lifer that caused by internal effects to the amplifier circuit itself in order to compare it with the noise generated by conventional amplifiers. The obtained analysis results of internally generated noise showed that the total output noise of bio electric active circuits dose not increase when some of their resistors have a large value. This behavior is caused by the different transfer functions for the signal and respective noise sources associated with these resistors. Moreover, the new designed bio electric amplifier has an output noise less than that for conventional amplifiers. The obtained analysis results were also experimentally verified and the final conclusions were drawn. (author). 11 refs., 2 tabs, 3 figs