USB Fading Star

This circuit uses a 555 timer IC and BC547 transistor which are cheap and commonly available and works on USB 

1   x NE555
1   x BC547
1   x 33K resistor
1   x 500 r variable resistor
1   x 9V battery
24 x LED red ( or other colors) 
  

Complete the circuit according to the circuit diagram, it is simple and has only minimum components, I used 5mm LEDs for the circuit,
 an IC socket for IC and for the transistor to prevent the components from burning due to the heat while soldering 

I had made a star using 5mm red led (you can make what ever shapes). for making it, i used a 3mm metal sheet cut into a square of 7cm and  drilled holes  as the shape of a star. when the USB  is plugged in the star light up and the slowly fades the light intensity can be varied by the variable resistor (500 ohm) 

Check for any errors in connection by connecting the Led circuit to a 3v battery source

For connecting the USB cable to the circuit, find a USB cable, open its pin portion you will find four wires, desolder the wires then remove any two wires of your choice and then connect the rest two wires, one in the upper end and other in the lower end, in the picture shown the red is the positive wire and brown is the negative wire. cut the other end of the cable connect the same two wires to the positive and negative of the circuit. then just plug it in to the USB slot

Hope you liked the circuit. please rate it and if you have doubts or any comments the please comment  and rate it........  this is the fade in or fade out effect