Mic preamp gain knobs

[Tobiah]

My audio interface has one for each mic input.
What would it take for a manufacturer to remove
these knobs from the interface and have that
value be controlled by software instead? What
would the simplest solution be for substituting
digital input for knob twiddling? I guess we're
really tied to the analog world here. Aside from
having a servo turn a pot, how could this be done?

[Chris K-Man]

_____

Well let me akse you this: Are there any issues with continuing
to have a knob representation for input gain adjustment? I
mean, it's what most folks are used to

[geoff]

Unlikey - the gain is near the front-end of the analogue circuitry,
before the A-D, and it's purpose is to boost the signal to a level where
the A-D can work optimally.

geoff

[John Williamson]

On a lot of mic preamps, the amplifier runs constantly at full gain,and
the level control limits the level it sees, helping avoid clipping. It
may also actually alter the gain if the first stage. Normal practoce is
to set the gain there at the start of the session, and then use your DAW
to control levels in the mix.

Controlling the preamp digitally adds complexity for no reason.

Some microphones have a 10dB pad on the outpout for the same purpose.


--
Tciao for Now!

John.

[Ralph Barone]

There might be some ideas here.

https://www.diystompboxes.com/smfforum/index.php?topic=113226.0

[Ralph Barone]

And it appears the old XIcor EEPOTs are discontinued, but you can maybe
still buy something similar.

https://www.renesas.com/us/en/products/analog-products/data-converters/digital-controlled-potentiometers-dcp/x9241a-quad-digital-controlled-potentiometers-xdcp-non-volatilelow-power2-wire64-taps

[palli...@gmail.com]

John Williamson wrote:
===================

> >
> On a lot of mic preamps, the amplifier runs constantly at full gain,and
> the level control limits the level it sees, helping avoid clipping.

** Horse poo.

Virtually all mic pres have variable gain.
Typically from 5 times to 1000 times ( 14 to 60dB ).

> It may also actually alter the gain if the first stage.

** Noting "may" about it.

[Scott Dorsey]

These days most of the kids are working on crazy low voltage rails and
using Maxim digitally-controlled pots. I strongly advise not using them
inside the preamp feedback loop, though.

The THAT 1580 digitally-controlled preamp IC is a very easy all-in-one
solution, though, and cleaner than most of the standalone digitally-controlled
pots.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[INFOHOU]

The Avid Carbon interface has pres that are controlable from withing Pro
Tools. I believe I can do it with my UA Apollo through their Console app. The
Apollo can also imitate various mic pres. However, the Carbon has better
converters. Not sure my old ears can hear it, but the reviewers claim it. I
definately noticed an increase in clarity on my main system (2019 Mac Pro with
Genelec 8010As/sub) going to the Carbon from a MOTU M2, but I digress.

Hope y'all have some fun,
Robert