FLYING_SPOT_SCANNER_PROTECTS_MICRO_FILM

Published:2009/7/23 23:10:00 Author:Jessie | From:SeekIC

When black mark on microfilm covers quiescent spot, sweep is tripped and rectangular pulse on cathode of V2 cuts it off. 931A multiplier phototube then sees 22,000-ohm load through V1 to give correct output.-A. C. L. Brown, Flying Spot Inspects Tv Rating Records, Electronics, 35;9, p 31-34.



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