I P Stepanenko | PubMed Health

PubMedDate not supplied

[4-channel electroencephalographic amplifier with integrated microcircuits].

To conduct electroencephalographic investigations of stationary and moving objects a small-sized 4-channel amplifier built with integrated microcircuits has been developed. Each channel includes a pre-amplifier, main amplifier, calibrator, high and low frequency filters and a power pack. The adoption of integrated microcircuits enables it to locate the pre-amplifiers directly on the object of investigations. The device is highly sensitive and secures a greater degree of noise-protection.

Amplifiers, Electronic↗

PubMedDate not supplied

[Static volt-ampere characteristics of biologically active human skin currents].

Results are presented of measuring static voltage characteristics of biologically active sites Xe-gy at various pressure of the measuring electrode on the skin. It has been shown that under other equal conditions conductivity of the active sites is 3 and more times higher than that of inactive sites in the whole range of the applied pressures. The current-voltage characteristics of biologically active sites are non-linear and have a region of reversible break-down on their inverse branch. With the currents higher than 200 divided by 300 muA an irreversible break-down of the site is formed, after which conductivity increases more than by an order.

Electric Conductivity↗