Multiutility Fleshing Light

Multiutility Fleshing Light

Summary
The circuit describe below can be used in many application like it can we use as fake light to create an impression that alarm has been fitted or you can use it in your vehicles when your car broke down as it will give eye catching appearance to the car passing near to your vehicle. This circuit can be used for decorative purpose in home. In this circuit you can also increase or decrease the intensity of fleshing LED according to requirement.
Description
To understand the working you should know about the truth table of NAND gate are as follows-

Input		Output
A	B
0	0	1
0	1	1
1	0	1
1	1	0

In NAND gate we will get output when any of the input signals go low and if both are high we will not get output in that case.
In this circuit pin 3 always oscillates back and forth from high to low during one cycle capacitor charge in on direction giving output and again charge in opposite direction to remain off. Consider the case when you on the circuit for first time at this time voltage at pin 3 is zero and voltage at pin 1 and 2 is high which is feed to pin 4 which is also high and pin 5 and 6 initially connected to pin 3 through capacitor and resistor are also low but after some time capacitor connected between pin 3 and 5 start charging with the help of C1 and R1 voltage at pin 3 also start building which is internally connected to pin 12 and 13 as a result output pin 11 become low and this is supplied to pin 8 and 9 and pin 10 become high and we will get output means LED connected to it start conducting.
After preset interval of time depending on the value of capacitor and variable resistor the polarity of the charge across C1 & R1 has reversed. Pin 4 is low and pin 3 is high. C1 again starts to charge once more. But this time in the opposite direction. Since pin 3 is now high and pin 4 is low the junction of C1 & R1 represents the negative side of the capacitor. As the capacitor charges the voltage on this junction will fall. This means that the voltage on pins 5 & 6 will fall. When it falls to just below half the supply voltage the inputs change from high to low. And the output of gate 2 will go high. Pin 4 will take pins 1 & 2 high. So pin 3 will go low. And again LED start fleshing. In other words the first cycle is complete. And again and again this cycle continuous we will get the output.

If you want to increase the time period just change the value of R1 and C1 and see the deference.

Components
IC
IC1(CD4011)	1
Resistor
R1(100K)	1
R2,R3(1K)	1
Capacitor
C1(1uF)	1
Miscellaneous
LED(1-6)	6