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We need the following components:
one LTR-4206E phototransistor
one lithium CR2032 battery (3 V)
2N3904 transistor
1K resistor
Photos of these components:
Working process:
First, take the Transistor and resistor and solder them as shown in the figure:
Next, solder a phototransistor to this design:
Next, we attach the LED:
And then the power source:
And now we look at what we got:
This light will turn on when it gets dark
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