Optical controlling switch circuit using LDR transistor

Published:2011/4/10 21:00:00 Author:Ecco | Keyword: Optical controlling switch , LDR transistor | From:SeekIC

When there's incident light, the LDR in the circuit connects to high level or zero level. The transistor amplification factor βshould be higher than 100, the value of LDR is between 00Ω ~ 100kΩ, they are suitable for bright light and dark shooting situations respectively. If you want to control the high power load, you should adopt Darlington transistors.



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