Christmas is just around the corner and finally its time to decorate our home with attractive lighting and other stuffs. The above given electronic design may help you to make a personalized Christmas tree lighting by your own. This circuit uses simple IC 555 and Dual flip flop IC to generate various frequency signals and use those signals to lit the LED’s in a pattern. Most of all this Christmas tree lighting circuit diagram will help you to build low cost beautiful lighting.
The 555 timer IC was wired as an astable multivibrator which produce square wave as output in its pin 3. The frequency of the output pulse depends on the Resistors and capacitor connected to the pin 7,6 and 2 of the timer IC. Also a pot can be used in the place of Resistor R1 if you wish to alter the operating frequency of the IC 555. To calculate the output frequency of 555 use the below formula
F= 1.44/ (R2 +2R1)C2
The dual flip flop IC 4013 forms the next stage of this design. The dual flip flops was wired in such a way to divide the frequency of the incoming signal from the astable multivibrator. The IC2:A divides the incoming signal by a factor of 2 and the output signal obtained from the pin 1 will be F/2 frequency of the original signal. On the other hand IC2:B divides the signal further by a factor of 2 and gives F/4 signal frequency in the output pin 13.
The final part of this circuit was the combination of LED’s and transistors. The transistors acts as a switch to turn LED’s on and off here. The design shows only one Transistor and LED combination for simplicity. Use individual Transistor and LED combination for each of the output signal that is F, F/2 and F/4 signal outputs.
Each transistor can drive about 20 LED’s connected to it. You can increase the number of LED’s by choosing the appropriate transistor. As a result the three different signal frequencies will produce a beautiful lighting effect.
- Substituting R1 with (0-100k) POT will help you to obtain wide range of frequency outputs. This will increase the attractiveness of this lighting effect.
- Choose different color LED’s rather than the same for each output signals.
Wound the LED’s around your tree and your personalized lighting for X-mas tree is ready.
Latest posts by Frank Donald (see all)
- 10 circuit design tips every designer must know - April 14, 2018
- Guide to Pull up / Pull down resistors and its usage - March 29, 2018
- Light controlled LED lights and DC fan using IC 555 - February 15, 2018