Make sure you view all the videos posted in Part 1 before continuing.
The ELK-120 sound board can pull up to 2A@12VDC and the mouth servo may require more current @5VDC than the Arduino's voltage regulator can support, so I went with a dual-output power supply that provides 12VDC and 5VDC outputs.
However, the Arduino and the DF Robot Relay boards all need 9VDC.
