If R, the sensor matching resistor, is equal to the `dark` resistance of the cadmium sulfide cell, the amplifier output will range from 0 to `` 2 as the lightlevel ranges from `dark` to `bright.` The circuit in Fig. B operates similarly, but use the standard noninverting configuration instead of the voltage-follower configuration;
Light-level-detector - schematic

this allows for variable gain. Although the "dark" resistance of the cadmium sulfide cell is only "" 7 KO, the principles of operation apply to other types of detectors which require the high-input impedance of the HA-5180 for reasonable linearity and useability.

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