SIX_RANGE_LIGHT_METER

Published:2009/7/9 4:15:00 Author:May | From:SeekIC

Switching of feedback resistors for opamp driven by Radio Shack 276-115 selenium solar cell gives multirange linear light meter. With 1000-megohm resistor for highest sensitivity, star Sirius will produce pho-tocurrent of about 25 pA when aolar cell is shielded from ambient light with length of cardboard tubing. Supplies are 9 V, and meter is 0-1 mA.-F. M. Mims, Integrated Circuit Projects, Vol. 4, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 45-53.



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

Print this Page | Comments | Reading(3)