Simple Bucky head circuit to move the jaw

d0ugparker said:

Where are simple, pre-manufactured circuits, or easy-to-build
circuits to take a mic input and do a simple servo movement
of a Bucky skull's jaw in parallel with an actor speaking into
a mic? I know they're readily available, I swear I remember
seeing them and playing with them somewhere, I just can't
pinpoint the source!

Thanks!

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