>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 May 2006 14:48
>To: Microcontroller discussion list - Public.
>Subject: RE: [EE] switching audio signals 50W
>
>
>The amplifier is already installed.  Essentially its for a 
>science display unit, where a single audio signal is sent to 
>this multi-channel amplifier.  Sensors pick up when the person 
>is walking along, so rather than blasting out audio all along 
>the walkway, it "follows" the user, switching it from one 
>speaker to the next.
>   
>  Yes..there are issues.  The exhibit is designed so that the 
>viewer will be single or at least grouped together so no 
>worries about having to turn on the speaker 3 stations 
>behind..etc.  The other issue, and the client is aware, is the 
>possible "popping" of the speakers when they are turned on and 
>off. But he will live with that.
>   
>  So, relays it is.  And yes there is of course, a PIC driving 
>the relays and watching the sensors.


Hang on...is the signal to be switched going *into* the power amps rather than the speaker level outputs?  If so that opens up a whole bunch of other non-relay opportunities.  You could also fade in/out the different speakers to prevents popping etc.

Regards

Mike

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