THREE_RANGE_LIGHT_METER

Published:2009/7/13 3:34:00 Author:May | From:SeekIC

Uses probe containing Clairex 905HN light-dependent resistance element, connected to DC differential amplifier driving meter having specially calibrated scale. Article gives calibration procedure. Switching circuit provides constant check on voltage of 22.5-V battery. If 4.5-V battery is low，full-scale adjustment cannot be made Resistors having values specified in article are connected in turn to terminals of photocell jack P1 for calibration that gives linear scale reading.-J.L. Mills, Jr., Light Right？－Do-It-Yourself Photo Exposure Meter, 73 Magazine, Sept.1978,p 204－206 and 208-211.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Measuring_and_Test_Circuit/THREE_RANGE_LIGHT_METER.html

Print this Page | Comments | Reading(3)