>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 May 2006 00:53
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE] switching audio signals 50W
>
>
>alan smith wrote:
>> 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.
>
>Considering the cost of decent relays and the low cost of audio amp 
>chips I would use a power chip per channel. If you only drive one at a 
>time your power supply is still small.

That's ok, but not so good if the OP wants several different amp outputs to be switched to a common speaker.

I can't think of anything more suitable than relays for this, any solid state switching scheme is going to end up far more complex.

Regards

Mike

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