EXPOSURE_INDICATOR_FOR_ENLARGER

Published:2009/7/21 4:17:00 Author:Jessie | From:SeekIC

One leg of Wheatstone bridge is unbalanced by light shining on phototube. Sensitivity of circuit is adjusted to match speed of enlarging paper with potentiometer that changes d-c voltage applied to phototube. Meter can be calibrated directly in seconds of exposure -J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, N.Y., 1956, p 291.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/EXPOSURE_INDICATOR_FOR_ENLARGER.html

Print this Page | Comments | Reading(3)