Relays probably the best. Look at the current in a 4 ohm speaker to generate
50 w it in the order of 3-4A this has to be switched without adding
distortion so the on resistance of the switch ie critical. Check out
amplifiers that have an anti thump relay (never an anti thump fet switch).
Relays are also available double pole for more than one channel in a single
switching device!

Rgds Steve 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
alan smith
Sent: 08 May 2006 04:22
To: Microcontroller discussion list - Public.
Subject: [EE] switching audio signals 50W

OK audio guys.....
   
  I have an amplifier that can deliver up to 50W of audio per channel, and
need to switch on and off differnent channels outputs depending on some
control inputs.  I was thinking of relays but that rather a large real
estate usage, so wondering about just using some of those small solid state
photoMOS relays, like those used in telco applications.
   
  Its a one-off project, so production costs aren't of a real issue other
than I do want to keep costs down of course.

		
---------------------------------
Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.  Great rates
starting at 1¢/min.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist