Re: Controlling Potentiometers from a PC



Magnus.Moraberg@xxxxxxxxx wrote:

Hi,

I have an analog audio circuit which contains a number of pots. I'd
like to be able to control these pots from a PC using a program I have
written in C++.

So for example, I'd like to tell my program to adjust the volume from
min to max over the course of 10 seconds and receive the exact same
audio result as I would get it I was to adjust the volume knob with my
hand. In other words, I don't want any static or glitch induced into
the audio output.

I have looked at digital potentiometers but it seems to me that they
are not suitable for my application since they adjust the potential in
a stepping manner. Any comments on this?

So I'm wondering if the best option is to output an smooth analog
signal using a dac and then have this signal either control a
potentiometer or else create the potential by some other means. Any
comments on this? What devices might I look at?

Look at the recent threads below on MDAC like devices such as TI's
PGA2310.

"Anyone here familiar with so-called 'zipper noise' in audio
remote/automation level control applications ?

zippers and rabits

Does turning a volume knob create sidebands?"

Also consider motorised pots from the likes of ALPS.

Graham

.

Relevant Pages

  • Tone controls
    ... Pots are the best way to control audio. ... the crossover frequency. ...
    (sci.electronics.repair)
  • Re: Tone controls
    ... Pots are the best way to control audio. ... the crossover frequency. ...
    (sci.electronics.repair)
  • Re: Controlling pots digitally
    ... We have a pair of speakers which we need to control from a pc. ... in the audio path, and the lamp is controlled by a DC voltage ... and goes up to 2M when the lamp is dark. ... Motor driven pots are mostly for where you want to store the ...
    (sci.electronics.design)
  • Re: Controlling Potentiometers from a PC
    ... I have an analog audio circuit which contains a number of pots. ... like to be able to control these pots from a PC using a program I have ... I have looked at digital potentiometers but it seems to me that they ...
    (sci.electronics.design)
  • Controlling Potentiometers from a PC
    ... I have an analog audio circuit which contains a number of pots. ... like to be able to control these pots from a PC using a program I have ... I have looked at digital potentiometers but it seems to me that they ...
    (sci.electronics.design)