matthieu68
Active member
- Joined
- Jul 11, 2017
- Messages
- 34
Hello, I have been following the Forum for some time, very interesting.
I have already done several DIY projects, and I want to learn more, I bought a few books that deal with audio electronics, and to learn you have to do as they say.
I therefore embark on a first stage, that of the line input.
I had a desym PCB made some time ago which I think (I hope) is good.
I would like to put a trim on the line input, I would like to be inspired why not by the trim of the old MCI jh600 console (trim -6db / 0db / + 6db)
But in the original diagram the trim controls the deymetrization opamp, Is it possible to integrate a similar system after my deymetrization system?
This raises another question to which I don't have a clear answer,
An input is in + 4dbu, after the desym stage my signal should be identical or 1.228v, but I read here and there that the working level in a unit or mixer should be turned to -6db or 0.388v.
To make this fall what means is it used?
An inverter opamp?
It would therefore be necessary to put after my desym an inverter opamp with switchable resistors? to obtain respectively -12db / 0db (which will be the nominal level of the circuit is -6db) and + 6db
Thanking you
I have already done several DIY projects, and I want to learn more, I bought a few books that deal with audio electronics, and to learn you have to do as they say.
I therefore embark on a first stage, that of the line input.
I had a desym PCB made some time ago which I think (I hope) is good.
I would like to put a trim on the line input, I would like to be inspired why not by the trim of the old MCI jh600 console (trim -6db / 0db / + 6db)
But in the original diagram the trim controls the deymetrization opamp, Is it possible to integrate a similar system after my deymetrization system?
This raises another question to which I don't have a clear answer,
An input is in + 4dbu, after the desym stage my signal should be identical or 1.228v, but I read here and there that the working level in a unit or mixer should be turned to -6db or 0.388v.
To make this fall what means is it used?
An inverter opamp?
It would therefore be necessary to put after my desym an inverter opamp with switchable resistors? to obtain respectively -12db / 0db (which will be the nominal level of the circuit is -6db) and + 6db
Thanking you