On a sunny day (Sun, 1 Mar 2020 10:11:02 +0000) it happened The Natural
Philosopher  wrote in :

>Try the LM833.
>
>https://www.onsemi.com/pub/Collateral/LM833-D.PDF

Looks nice, real audiophile opamp:-)



>At typical phono cartridge/MC microphone source impedances, that's
>around 4nV per root hertz

+ and - 15 V !
the reason I use the TLC274CN is that it can run without extra supply circuit
in a 5 V or 3.3 V microprocessor circuit (such as a Raspi add on circuit),.
My personal opinion about audio is a bit different,
where I live, due to environmental noise, 60 dB dynamic range would be enough.
I no longer have a vinyl player, most is mp3 on this laptop, 2354 titles my
software shows...
But indeed for professional recording that LM833  seems to be a nice chip.
I do have a USB stick plugged into the raspi with a mike input and electret
connected.
Automatic gain control active :-)
Noise


>  Noise performance of Bifets like TL074 only beats that when running
>from very high source impedances.
>
>I used to try and get close to 2nV/root Hertz when designing phono inputs.

Very impressive
long before that on my old Garrard turntable with Shure element you would hear
all sorts
of motion related artifacts.


Digital is nice... there is a lot of good compression software too for Linux:
lame,
and players like mpg123.
And of course things for the wave format.
Multi-channel wave was once part of a project I did, for multiple languages
simultaneous translation,
that resulted among other things in multimux for Linux, some of that old stuff
is here:
 http://panteltje.com/panteltje/dvd/index.html
xpequ I still use these days
 http://panteltje.com/panteltje/xpequ/index.html
 can drive my LED strip controller:
  http://panteltje.com/panteltje/pic/ethernet_color_pic/

I have xpequ running on the P4 and col_pic too:
 http://panteltje.com/panteltje/pic/col_pic/index.html


Getting carried away here, audio IS an interesting subject ;-)

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