SIX RANGE LIGHT METER


Posted on Feb 4, 2014

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. M..


SIX RANGE LIGHT METER
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