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Step 9Add the Transistor
Bend the outer two legs of the transistor outward, and cut the center (the base) short, as shown. Also cut the lead from the resistor short, too. Orient the transistor as shown in the picture (flat side up) and solder the base to the lead from the resistor.
The transistor allows the microcontroller, which can source only 10 ma per pin, to drive these LEDs, which can draw up to 100 ma. When a current goes through the base, it allows power to flow through the LEDs (at the collector) to ground (the emitter) in this circuit.
The transistor allows the microcontroller, which can source only 10 ma per pin, to drive these LEDs, which can draw up to 100 ma. When a current goes through the base, it allows power to flow through the LEDs (at the collector) to ground (the emitter) in this circuit.
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