camera electronic metering system

Published:2011/9/6 23:34:00 Author:chopper | Keyword: camera, electronic metering system | From:SeekIC

In the midrange camera, CdSphotosensitive resistor is taken as electronic metering device. Light is on the CdSphotosensitive resistorthrough the orifice, and you can move thedensity plate, so that the circuit will achieve a balance, and then two LEDs will light evenly to express the proper exposure.If only onelights while the other does not, it is due to underexposure or over exposure, then moving the density board can achieve the correct exposure purpose.The thermistor RM in the circuit(1kΩ) has temperature compensation function, to compensate error for temperature changes caused by photosensitive resistor.



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