Page 69 - Electronics Starter Kit_EN
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When C1 and C2 gets empty, red LED will turn OFF, and the second part will start working,
because the output of NE555(1) is connected to the base of 2N2222 NPN Transistor, and the
transistor will activate the second part.
When the second part is activated, the green LED will light up, it is already connected to GND, it
is only in need to 5V.
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