July 05, 2009

Light/Dark Detector

8:47 PM  Sabarish  No comments

INTRODUCTION
This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light.

circuit diagram:-

Schematic for Light/Dark Detector

Part
Total Qty.
Description
Substitutions
R11100K Pot
Q112N3904 NPN Transistor2N2222
Q21NPN Phototransistor
RELAY19V Relay
MISC1Board, Wire, 9V Battery Snap (if battery used), Knob For R1

Notes

  1. R1 Adjusts sensitivity.

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Electronics is the study and use of electrical that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves. and semiconductors. The pure study of such devices is considered as a branch of physics, while the design and construction electronic circuits to solve practical problems is called electronic engineering.

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