spec - spec link
Movement of bells or strikers is generally accomplished by electro-mechanical means. Motors and electromagnets require large amounts of electric current to put these heavy components into motion.
Alternatively, compressed air can be used as a pneumatic source of power while low current electro-mechanical valves pulse the flow of air into the actuators. Pneumatic strikers have been fitted, especially to tubular tower bell chimes. [
http://www.chimemaster.com/carillon-autoplayer Pneumatic 'fingers'] have been fitted to traditional carillon keyboards for automatic play.
=== Electronics ===