GREEN-RED LED blinker
Construction of an alternate colourful LED circuit is a fascinating hobby for electronics enthusiasts and novices. A simple 2-coloured LED, with Red and Green colours configured in an astable multivibrator circuit, is described here to construct and enjoy the blinking LEDs during festivals, functions and birthday parties, which are welcomed by many.
Know your circuit
The green-red alternate LED blinker circuit schematic is given here. It is a straightforward, simple circuit. Any novice can easily build this fascinating LED blinker circuit project for personal use or to share with friends.
The circuit uses very popular low-cost 2 silicon transistors.
Know your design
The two silicon transistors are configured in an astable multivibrator mode, which works alternatively to illuminate the appropriate LED for a few seconds. The duration of blinking LEDs depends upon the RC network connected to the transistors. The timing can be adjusted for longer or slower duration by altering the values of electrolytic capacitors coupled to transistor bases individually. Otherwise, one can change the values of the base bias resistors (10K ohms). One can add a 10K ohms adjustable preset by replacing the fixed resistors.
The circuit works on a 9V DC power supply. It can be powered through a 9V PP3 battery as well, to use it anywhere you like.
Parts list
BC 547 NPN Silicon Transistors ............2 nos.
100 MFD 16V electrolytic capacitors ......2 nos.
10K ohms resistors .................2 nos.
470 ohms resistors .................2 nos.
LED1 RED colour LED............1 no.
LED2 GREEN colour LED ........1 no.
SW on/off switch .............1 no.
9V PP3 battery ............1 no.
How to build a musical light circuit yourself-click here.
Know your assembling
The circuit can be easily assembled on an electronics solderless breadboard. One wishes it could be built on a general-purpose PCB, also for compactness and sturdy handling. Observe the polarity of the electrolytic capacitors while wiring on the board. As I said earlier, the blinking speed of the LEDs can be increased or decreased by changing the RC network values. It is enough that any one component value be changed to achieve the desired result.
Conclusion
Often, students of the electronics discipline and school/college students like the project most as it is simple to construct and cost-effective. Definitely, this project takes part in school exhibitions constructed by students in the science discipline, and many hobbyists' favourite multivibrator circuit for demo as well as study purposes. Please give your comments here.
No comments:
Post a Comment