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bans25 31st March 2005 11:44 AM

Professional to Consumer line level converion and back!
OOps I accidently posted this to Digital section.

Hi all,

I am new to playing in the audio / video world :) so forgive me if I ask dumb questions! :).

Currently I am using a TI AIC23 ( ) audio codec with consumer line level inputs and outputs.

What I need to do is make a PCB that will convert these I/O's to interface with Professional equipment (+4dbu).

So I need to PAD the input to the codec (Professional line level ----> Consumer line level) and then I need
to amplify the output of the codec (Consumer line level ----> Professional line level)

Of course this all needs to fit on a PCB 3" x 3" and be low noise! :)

anyone have any ideas?

Any suggestions are greatly appreciated

marsanpin 2nd April 2005 09:24 PM

Schematics on the inet or readily available
Hello ban25,

I did something similar some years ago when I needed to run some 25 mts of audio cable - line level - from one room to another. You may try some googling under unbalanced to balanced audio driver or ... converter/circuit.
I have somewhere a link... Anyway, the 2 circuits consist of an unb/bal conv. and vice-versa; they are built around op-amps TL071/72 types and if powered by dual +/- 18 volts it gives a nice headroom. Like that the cable run can go up to 200 mts (yes you need to make the ft! conv. - SI applies!) You can also go the expensive way and get those modules from (radio design labs, USA)

Good luck in your projects.


rtirion 2nd April 2005 09:44 PM

unbal - bal - unbal
Rod Eliot has just the info you are looking for.

I suggest you have a look at his excellent site.

Checkout projects 51 and 87 under "preamps and accessories"

Rod can supply you with the necessary PCB's.


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