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Author Topic: Stereo Audio Mixing  (Read 1186 times)
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MAXPAYNE
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« on: September 12, 2014, 01:01:41 13:01 »

I am looking for a chip, which will be able to mix two stereo audio input and provide a single stereo audio output. I was thinking of using the chip M65845AFP for this purpose, but the input of the chip is microphone input. My application is attached in the image. I am planning to use the following Bluetooth device to get microphone audio (From Iphone, mobile, Bluetooth Headset etc.)

http://www.newegg.com/Product/Product.aspx?Item=9SIA4GW1EU7471&cm_re=bluetooth_audio_receiver-_-9SIA4GW1EU7471-_-Product

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str67
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« Reply #1 on: September 12, 2014, 02:05:22 14:05 »

Hi,

the most simple solution would just be a quad audio OPAMP like LM3900 for 2x2 channels (http://www.electroschematics.com/544/3-channel-audio-mixer/).
It is not really necessary to introduce an (A/D -> DSP -> D/A) chain into the audio path for pure mixing, neither will it improve the quality...

Just my little thoughts...
str
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Signal
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« Reply #2 on: September 12, 2014, 02:15:22 14:15 »

I am looking for a chip, which will be able to mix two stereo audio input and provide a single stereo audio output.
Two op-amps in one soic-8 can sum two stereo inputs. What additional functionality do you expect from a mixer?
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« Reply #3 on: September 12, 2014, 03:23:37 15:23 »

I can't wait to see the end result, in my minds eye, I see MaxPain, (sic) 
going 100MPH an a skate board, a flashing disco light show & a 1000W beat box.
The Local Police will have a field day, writing out the ticket.
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an007_rld
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« Reply #4 on: September 13, 2014, 12:24:45 00:24 »

Try the attached schematic.

Regards,
-an
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CocaCola
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« Reply #5 on: September 13, 2014, 01:17:05 01:17 »

I'm guessing a bare basics stereo summing circuit will be plenty sufficient in this application, as it appears you are mixing at line level?

For example...

« Last Edit: September 13, 2014, 01:19:14 01:19 by CocaCola » Logged
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« Reply #6 on: September 13, 2014, 01:22:02 01:22 »

I don't know what to say, since I was 13 years old, I knew that a mixer is used to mix multiple signals to give one output, what kind of affliction do we have on this forum.. man your application is very simple such that you won't have to use CX20701, any transistor/opamp mixer works fine.

You could use a simple analog switch to switch between inputs instead of using a mixer as well, just an idea.
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Signal
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« Reply #7 on: September 13, 2014, 02:32:18 02:32 »

CocaCola, why do you place 20K resistor there? What benefit a crosstalk could have? Or there is an other purpose?
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CocaCola
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« Reply #8 on: September 13, 2014, 04:49:19 04:49 »

CocaCola, why do you place 20K resistor there? What benefit a crosstalk could have? Or there is an other purpose?


It's not my circuit, it's a long standing public circuit from Rane http://www.rane.com/pdf/ranenotes/Why_Not_Wye.pdf
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MAXPAYNE
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« Reply #9 on: September 13, 2014, 05:14:17 05:14 »

As always I am very grateful to all of you. I forgot the basics, searching everything for chip based solution. Sad
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Signal
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« Reply #10 on: September 13, 2014, 07:03:30 07:03 »

It's not my circuit, it's a long standing public circuit from Rane http://www.rane.com/pdf/ranenotes/Why_Not_Wye.pdf
Ok. Then to eliminate misleadings this is not a stereo mixer. This is a mixer of two mono balanced lines originally named as "Balanced summing box" obviously without intention to add crosstalk.
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