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CdS photoresistor for electronic metering device circuit

2014-11-02 17:51  
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CdS photoresistor for electronic metering device circuit
As in block cameras, CdS photoresistor can be used as electronic metering device. The light irradiation passes through the orifice in the CdS photoresistor. The MDF can be moved to achieve a balance of the circuit. When the two LED light emitting diodes are with uniform light, it is said proper to exposure. If only one lights while the other does not, it means that it is with insufficient exposure or over exposure. Thus, the MDF can be moved to achieve the correct exposure. The thermistor RM (1kΩ) in the circuit affects well for temperature compensation and compensates for error caused by temperature change of photosensitive resistor.