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HAHA! I'm well on my way to making the Bucky skeletons I bought a few weeks ago talk. I built a nifty circuit that is posted on Scary Terry's web site that uses audio to drive a servo motor. As audio comes into the circuit, it is processed so it makes a servo motor inside the skull open and close the jaw by way of a rigid wire going from the motor to the jaw. This should kick ass on Halloween.
Photo of the circuit/batteries/motor inside the skull:
Photo of the circuit/batteries/motor inside the skull: