# Help needed - Computer Driven P.A. System

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#### setch

##### New Member
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.

Thanks

#### Sebi

##### Active Member
Yes, the soundcard output can drive the PA. But keep in mind: Windows also generated different tones itself,disable it.

#### Gene

##### New Member
This must be a science project - to see if you can do it. Otherwise, it makes no sense to drive the PA with a $1000 computer in place of a$50 switch. Hope you get an A.

#### bogdanfirst

##### New Member
he needs a Wav file ...
but might use a recorder chip too.
but it seems like a practical idea.
but instead of a compuster you can use a cd player.
but the reason for the computer is that he needs to make a program ro play the file automaticly at some preset times wirght?

#### Snoot

##### New Member
just feed the output of the soundcard into a 100v line pa system this will allow you to feed the speakers in the school with the signal and will only require bell wire between the amplifier and speakers

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