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5 Volts batery suplay made of 4 ni-mh baterys conected in serial,I have add the switch and conector from old 9volt batery.
Led CD-Boxby macobt
light detector, no microprocessors, just simple electronics :)by amando96
Paper WALL-E with ledsby macobt
DIY 1,5 V to Light Up 15 LEDby rokhmad1080
Change 9 volts to 5 voltsby Volthaus Electronics Laboratory
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