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Picture of usb powered blinking led
i will show you how to make a led blink and use a usb port of the computer as a power source.
 
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Step 1: Materials

Picture of Materials
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What you will need:
1] 555 timer
2] 1k ohm resistor x2
3] 100 ohm resistor
4] led{any color i used a green}
5] capacitor [depending on the blinking rate. see next step}
6] circuit board
7] usb male connector
8] 555 timer holder {whatever it is called}

Step 2: The capacitor

Picture of the capacitor


you can use any capacitor in the range of 10uf  to 1000uf depending upon the blinking speed.
if you take a capacitor of less value will blink the led faster.
if you take a capacitor of more value will blink the led slower.
i used a 100 uf capacitor.

Step 3: Solder the circuit

Picture of solder the circuit
here is the circuit digram . solder the the circuit according to the digram.

Step 4: Connect the usb connector

Picture of connect the usb connector
we will need only the red and black wire.
my connector had red and a blue wire.
connect the red wire to the positive terminal of the blinking circuit.
connect the black wire to the negative terminal of the blinking circuit.

Step 5: All done

Picture of all done
if you like the instructable follow and plz rate and please please vote for the 3rd epilog challenge
 my e-mail id is rohit1398@gmail.com