CAUTION: This circuit is very sensitive. Too much light will "slam" the needle of an analog meter. This circuit is based upon those used in some precision, laboratory-quality light meters. To zero meter, connect pin 2 to ground and adjust offset (R5) until meter reads 0. Then disconnect pin 2 from ground. R4 is an optional control for altering sensitivity of the circuit.

Page last modified on May 12, 2019, at 03:22 PM
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