Servo Singing Skull
Scary-Terry's designed the original circuit for
driving the skull jaw with a servo. Follow this link to find his info.
Scary-Terry's singing skull with Vaseline marbles for eyes and UV blacklight LEDs behind the eyes
You can buy the circuit to drive
the circuit from www.cowlacious.com Manipulating the audio file to drive the circuit can be time consuming. If you feed background music of the song
into the circuit, the mouth will stay open completely. Other haunters have advocated recording a talking track on the right channel with the song/music on the left channel.
I found a faster technique using a free piece of software, Audacity.
This gives a right channel that will get split into circuit that will properly open and close the mouth. Matching up 4 songs on 1 CD may mean adjusting the amplitude of the right channel of the song, so they all work
with the same level of gain set on the circuit. 3 out of the 4 I ran fine, the last one I have to squash down the amplitude so it would work correctly with the other 3.
