Camera Photometric System Circuit

Published:2011/5/6 0:28:00 Author:Joyce | Keyword: Camera Photometric System Circuit | From:SeekIC

The camera photometric system is composed of two transistors. When the luminance of the subject to be shot is weak, the value of the cadmium sulphide photoconductive resistance will increase,then LED2 will not flash due to cutoff of V2. At this time V1 will breakover,and LED1 will shine. When the luminance of the subject to be shot increases, the resistance of CdS will decrease, and then LED2 will go out,and LED2 will give out light. In this way, it points out whether the flashlight is being used or not.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Amplifier_Circuit/Camera_Photometric_System_Circuit.html

Print this Page | Comments | Reading(3)