Improvements in or relating to correcting circuits for photo-electric cells

摘要

534,650. Valve amplifying circuits. GES. ZUR FORDERUNG DER FORSCHUNG AUF DEM GEBIETE DER TECHNISCHEN PHYSIK AN DER EIDGENOSSISCHEN TECHNISCHEN HOCHSCHULE. July 20, 1939, No. 21106. Convention date, July 21, 1938. [Class 40 (v)] The distortion of a television signal due to the inherent capacity of the photo-electric cell, or due to the after-glow of the screen of a cathode-ray tube used for scanning a film can, according to the invention be corrected by the circuit shown. The cell potential U is applied to a potentiometer R 1 , C 1 feeding a valve E, so that the output of the valve fed into the impedance Z is the time derivative of U. A second valve E 2 feeds into '' an output proportional to U. If both inherent capacity and screen after glow are to be corrected, two such circuits in series are used.