Your info is limited as per post #15

 

The mp3 player can drive the LM386 directly.
The guitar pickup is not the same.
Can the guitar output drive the LM386 to your satisfaction ?

 

Your info is limited as per post #15

i tried to give as much info as i could..
i have a guitar
and my phone as mp3 player
now i want to play the guitar along with my mp3 track..
it is this simple

 

The mp3 player can drive the LM386 directly.
The guitar pickup is not the same.
Can the guitar output drive the LM386 to your satisfaction ?

yes..i have the amplified guitar signal

 

Hmmm !
I believe guitar signal will be almost same as a mic level signal.

 

Follow this page, study it and get back.
You can make 3 circuits as in figure 1.
1 for Guitar, 2 for mp3 left and right..
then mix them as in figure 2 , L + R, then feed the output to the stereo power amp.

{ed}
To avoid channel mixing you can use 2 for guitar amp.
Just tie the inputs together and feed the output to L and R seperately

 

You need a stereo mixer amplifier like this example , input your mp3 into L1,R1 and the guitar into L2,R2 ( note you link l2,r2 together) and the signals will be mixed..

 

@Dodgydave won't there be channel mixing upto some extent ?

 

Possibly, may have to alter the input resistors R2r,R2l etc...

 

Hello,

To avoid intermixing (cross talk), you could use two buffers on the mono signal and connect the outputs of the buffers to the mixer @Dodgydave posted.

Bertus

 

The mp3 player can drive the LM386 directly.
The guitar pickup is not the same.
Can the guitar output drive the LM386 to your satisfaction ?

The higher impedance the guitar input - the more sustain.

Some tube guitar amplifiers have a grid leak resistor as high as 6M8 on the first stage.

Dod produced a nifty little JFET pre-amp, I think the leak resistor was 3M9.
[

 

Mono input will not result in a stereo output

Some of the Philips electronic engineer kits did a mono to stereo amplifier - all it actually did was split the mono signal into HPF & LPF circuits so the 2 speakers produced different frequency ranges.

 

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.

You sort of do with a BTL amplifier - but the 2 amplifiers are driven by identical but anti-phase signals.

 

Hello,

To avoid intermixing (cross talk), you could use two buffers on the mono signal and connect the outputs of the buffers to the mixer @Dodgydave posted.

Bertus

i was thinking abt this. .what should i use for buffering?? lm386 ??

 

Look at the link I posted.
You should get an idea.

 

Look at the link I posted.
You should get an idea.

i am following something like this..will let u know the results..thanks

 

Guys i did it. I used four lm386 and it worked.Thanks a lot for all your suggestions.

 

NOPE.
LM386 are not buffers.
You cannot connect power amp outputs. You are likely to blow the LM386's

 

You did not study the ESP pages I showed you.
Buffers are OPAMPS like TL071 or TL072 used before the LM386

 

Do we need to draw you one so you can built it ?