Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

2 input mixing audio amplifier

Status
Not open for further replies.
S

Smart

Member level 4
Joined
Jan 28, 2006
Messages
72
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,288
Activity points
1,841
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
amplifier.png
 

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
 
  • Like
Reactions: Smart

    S

    Smart

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top