how can i build a mixer for this..it will havr 2 inputs ( 1 stereo and 1 mono)..and the output will be stereo..

 

Your stereo sound source would come from some device which is normally plugged into a stereo amplifier.

Your guitar (mono source) would normally be plugged into an instrument amplifier which contains a preamp, amplifier, power amp and speaker output. Some instrument amplifiers have a LINE output which is used to drive an external power amp or fed to a mixer. If you don't want to use an instrument amplifier you will have to build a preamp for the mono source.

You can sum the guitar LINE output and one stereo channel using a summing amplifier. The output of two summing amplifiers are fed into the stereo amplifier.

 

will i be able to output the stereo L and R with the mono signal in both ??

 

what i meant to say is i want the

stereo left (mp3) to output left
stereo right (mp3) to output right
guitar to output left
same guitar to output right

 

Is your guitar 'source' signal taken directly from the pickup or from the output of a pre-amplifier?

 

To keep the signal phase correct, you will need 4 opamps, or two dual opamps. For best sound quality these should be something like a 5534, not a 741 or LM358. also, dual power supplies, something like +/-12 V. Note that while the output of the MP3 player will drive headphones directly, the output of the mixer probably will not, or not very well. So there will have to be some kind of small power amplifier to drive the speakers as indicated in your drawing.

https://images.search.yahoo.com/sea...DcGl2cw--?p=audio+mixer+schematic&fr2=piv-web

ak

 

Is your guitar 'source' signal taken directly from the pickup or from the output of a pre-amplifier?

it is taken directly from the guitar

 

To keep the signal phase correct, you will need 4 opamps, or two dual opamps. For best sound quality these should be something like a 5534, not a 741 or LM358. also, dual power supplies, something like +/-12 V. Note that while the output of the MP3 player will drive headphones directly, the output of the mixer probably will not, or not very well. So there will have to be some kind of small power amplifier to drive the speakers as indicated in your drawing.

https://images.search.yahoo.com/sea...DcGl2cw--?p=audio+mixer+schematic&fr2=piv-web

ak

i want the output to be stereo. not a single summed mono

 

Mono input will not result in a stereo output

 

Mono input will not result in a stereo output

i dont want the mono signal to be stereo..i just want to fed the mono signal to both of my outputs along with my mp3 song

 

can't this be done??

 

So what do you have as of now?
An Amp ?
A preamp ?

 

It can be done but not how you have drawn the diagram.

 

Mono input will not result in a stereo output

He wants to mix a stereo signal with a mono signal resulting in a stereo output.

The mono signal should be heard in both channels.

The stereo signal should pass through on each corresponding channel.

 

Need to know his input levels.
Individual volume control or just a master volume or what.
Info is rather limited beside a poorly drawn diagram

 

He wants to mix a stereo signal with a mono signal resulting in a stereo output.

The mono signal should be heard in both channels.

The stereo signal should pass through on each corresponding channel.

exactly

 

Need to know his input levels.
Individual volume control or just a master volume or what.
Info is rather limited beside a poorly drawn diagram

i drew this for simplicity...i have both the L and R signal of the mp3 amplified individually with 2 lm386..and aslo amplified the mono(guitar)signal by another lm386...
now i want to send the amplified mp3 signals to corresponding outputs(out L & out R) and fed the mono(guitar) to both the outputs..

 

it is taken directly from the guitar

In that case whatever the pickup is driving will need a high input impedance to optimise the frequency response.

 

And you cannot sum the output of power amps as you have drawn.
You need to process the stereo and mono inputs before the power amp. One stereo power amp will do the job.

 

And you cannot sum the output of power amps as you have drawn.
You need to process the stereo and mono inputs before the power amp. One stereo power amp will do the job.

can u give me any schematic ??
any link?