Simple illumination photometry instrument circuit diagram

Published:2011/7/28 4:44:00 Author:Sophia | Keyword: Simple illumination photometry instrument | From:SeekIC

When the outside light is dark, the photodiode BG1 shows large resistance and allows small current. So, BG2 ends, BG2 connects, LED1 lights. When the light is bright, BG1 outputs strong current, so that BG2 can be in the saturation, BG3 ends and BG4 connects, LED1 is off and LED2 (red) lights. When the light is normal, three transistors are in amplified state. two LEDs emit dim light.



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