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The parts you need are: 3 Capacitors (from 470uF to 4700uF, each ),
a 2N3904 transistor, a 2N3906 transistor, a resistor(1k to 10k ohm
), a solar cell (minimum 3 volts )(i used two 2 volt cells in
series ), a pager motor(or a vibrator ). you'll also need a blinking/flashing...