DESIGN AND CONSTRUCTION OF A CHRISTMAS LIGHT
Christmas lights are lights used for decoration around Christmas. The custom goes back to the use of candles to decorate the Christmas tree in upper-class homes in 18th-century Germany. Christmas trees displayed publicly and illuminated with electric lights became popular in the early 20th century. It is design with White, Blue and Red LEDs which flash at different rates to give a colorful display. It is a light sensitive circuit so that it will turn on in the evening automatically and stays on till morning. The circuit uses the popular Binary counter IC CD 4060 to flash the LEDs at different rates. Components C1, VR2 and R1 form the oscillator and the output pins 7, 5 and 4 become high / low sequentially. When one output turns high, a set of 3 LEDs turn on and when the same output turns off, the second set turns on. This sequence is similar in the other two sets of LEDs also but with different timings. The speed of the Flashing can be controlled through VR2.
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