I want to build a P.A./Break Time bell system for my local school. I want to control it from a PC. At certain times of the day it should generate some form of alarm (wav file) to advise of a break or dinner time. I can write the software to control it, but do not have a clue as to the electronics needed. Would I use a normal sound card attached to an external amplifier, or would I need something special? Any help on this would be appreciated.
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