line distribution amp / splitter suggestion

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dirty1_1garry

Well-known member
Joined
Oct 3, 2011
Messages
511
Location
Moscow
Hi Folks!

I need to create a line splitter / distribution amp from one stereo line to three line outs with volume controls.
I've read a couple threads, a lot of helpful info from Harpo and PRR here:
http://groupdiy.com/index.php?topic=36913.0
So please check my scheme and write a few notes about it.
And what opamps would be best to use here?

 

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You should place some resistors from + in of input opamps to the ground, 47k will be fine ( as you did on the output opamps).
You can use good old 5532. Also, the tracking of stereo pots is not so good, but maybe this isn't so critical here.
 
moamps said:
You should place some resistors from + in of input opamps to the ground, 47k will be fine ( as you did on the output opamps).
You can use good old 5532. Also, the tracking of stereo pots is not so good, but maybe this isn't so critical here.

Thanks for the note!
Looks like that
 

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Why both R1 and R5?

Why R7 4.7Meg and C5 470uFd? (Or is R7 in milli?)

Why are your images low-contrast and too blurry for a sore old man to read?
 
PRR said:
Why both R1 and R5?

Why R7 4.7Meg and C5 470uFd? (Or is R7 in milli?)

Why are your images low-contrast and too blurry for a sore old man to read?

Thank you for being joined to the discussion :)
Image replaced with higher quality.

I used Sound Skulptor mc624 input section as reference.

R7 is 4.7 mega ohm, it gives opamp gain close to zero and it gives a chance to change this resistor for changing gain.
 

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