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New Anna University (UG / PG) Nov/Dec 2016 and Jan 2017 Theory , Practical Exam Timetable
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Light Detector using LDR and LM555

Components :
555 Timer
Capacitor 0.01 , 10 , 0.01
Resistor - 10k,22k,47k ,330

Circuit Diagram :

Info :

When sensor receive the input from light sensor 555 timer will produce output to the speaker.

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may i knw , where these detectors r used!!!

“Work hard in silence, let your success be your noise...”


bro having one mistake on post bro....

you wrote the title circuit as two times bro....

"Good Decision comes from Experience"
"Experience comes from Bad Decision"

                                                                                      -Abdul Kalam



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