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Set up the voltage regulator on your breadboard. This chip, the LM7805 is a "5 volt regulator", meaning it takes an INPUT voltage ("+12V" from your adapter), and turns it into an OUTPUT voltage, +5V. It also needs to be connected to GROUND. This is a diagram of the regulator:
[[Image:7805_schematic.png | 350px 300px ]]
Notice the regulator has three legs. Each of these legs has to be connected to the right thing. From page 2 of the [http://www.fairchildsemi.com/ds/LM/LM7805.pdf datasheet], under "Pin Assignment" we see what each of the legs are. Looking at the front, they are numbered 1, 2, and 3, from left to right, and are labeled "Input", "GND", and "Output":
Set up a light bulb to be a power indicator, as shown in the images below:
[[Image:7805_schematic_w_bulb.png | 200px300px]] [[Image:7805_with_power_light.jpg | 200px 300px]]
Connect your power supply. If your board has power, the bulb should turn on.
*QUESTIONS: with your multimeter,