2 input mixing audio amplifier

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Hi,
I am looking for a 2 input mixing audio amplifier.
When "input A" has a signal, Amplifier should not amplify Signal B.
The amplifier is used in car and should be low noise.
Regtards
 

And if Signal B is present, it is a "mixer"?

I think it is more a Summer than a mixer..........

I suggest it be a front-end to an amp....................
 

You seem to be looking for an automatic switch, followed by a summing amplifier. For the latter, see AN-20 and AN-31, at ti.com.
 

For example Input B is an audio of a radio. And output is Signal B, which is amplified. When Input A, which is Signal from a Microphone, is active, then the Radio signal should be cut off and output should only be Signal A.
 

https://www.edaboard.com/threads/2799/

**broken link removed**

http://www.electroschematics.com/354/vox-circuit-schematic/

Found those in a few minutes using Google. You can use the output from the VOX to turn on a transistor connected to the 'radio' input which will 'ground' that input, or LED/LDR, or ....................

A simple summer will combine the two. See the remarks by tgootee
or
http://en.wikibooks.org/wiki/Circuit_Idea/Simple_Op-amp_Summer_Design
http://users.ece.gatech.edu/mleach/ece3050/sp04/OpAmps01.pdf
http://www.allaboutcircuits.com/vol_3/chpt_8/8.html
 
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