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Easy : 1 . cd case 2 solar battery x2 (5,5v ) 3 usb cable
put batteries in to cd case and add the wires.
thats all :)
You cannot use IC LM7805 because his operating voltage is 7 to 20 volt. If you add a silicon diode(example 1N4007) the voltage will fall 0.7 volt. Nice project !!!
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