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Just like any electronic appliance or circuit, you will need a poer source to power the circuit. In our case, we are using a 9V battery. You can use any other power source ranging from 4V to 9V.
You could also use a 3V coin cell battery, but the LED might not be bright enough to see. You can also use the power headers of an Arduino board that supplies a 5V and GND.
Connect the positive (red wire) to the resistor and the negative to the emitter pin of the transistor (see picture).
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