SIGNAL_LEVEL_CONTROLS_GAIN

Published:2009/7/16 2:25:00 Author:Jessie | From:SeekIC

Amplifier is used with nonlinear circuit elements to gel D-versus-log E characteristic approximating that of positive color film being scanned. When no signal is applied to grid of V1, all diodes in its cathode circuits are conducting, equivalent cathode resistance is lowest, and stage gain is highest. As signal level increases, diodes V4 through V9 successively stop conducting, with V9 turning off last to make stage gain a minimum.-R. lid. Farber and K. M. St. John, Scanner Analyzes Color Content of Movie Film, Electronics, 34:48, p 38-41.



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