Author Topic: Implementing Stereo Volume Control  (Read 1358 times)

0 Members and 1 Guest are viewing this topic.

Offline knapikTopic starter

  • Regular Contributor
  • *
  • Posts: 143
  • Country: au
Implementing Stereo Volume Control
« on: March 28, 2020, 06:46:09 am »
I'm planning to use an ISSI IS31AP2110 Class-D amplifier with line level audio input, but am kind of stuck in regards to how to implement volume control. The easiest way I can think of is with a dual gang potentiometer, but I want to try and avoid big, clunky through hole parts. I thought about using digital potentiometers, but found out they're not really suitable for AC coupled inputs.

Any opinions or ideas how I can do this? I'm a bit out of ideas.
 

Offline Messtechniker

  • Frequent Contributor
  • **
  • Posts: 840
  • Country: de
  • Old analog audio hand - No voodoo.
Re: Implementing Stereo Volume Control
« Reply #1 on: March 28, 2020, 06:50:35 am »
Have a look at the PGA2311 chip and its brothers.
Agilent 34465A, Siglent SDG 2042X, Hameg HMO1022, R&S HMC 8043, Peaktech 2025A, Voltcraft VC 940, M-Audio Audiophile 192, R&S Psophometer UPGR, 3 Transistor Testers, DL4JAL Transistor Curve Tracer, UT622E LCR meter, UT216C AC/DC Clamp Meter
 
The following users thanked this post: knapik

Offline knapikTopic starter

  • Regular Contributor
  • *
  • Posts: 143
  • Country: au
Re: Implementing Stereo Volume Control
« Reply #2 on: March 28, 2020, 07:03:55 am »
Have a look at the PGA2311 chip and its brothers.

Looks pretty fancy and easy to use, but its ~10x the price of the amplifier itself, so I'll take a look at other similar ICs
 

Offline knapikTopic starter

  • Regular Contributor
  • *
  • Posts: 143
  • Country: au
Re: Implementing Stereo Volume Control
« Reply #3 on: March 28, 2020, 07:33:17 am »
The LM1972 will probably do the job, so thanks for the help there.  :-+
 

Offline SiliconWizard

  • Super Contributor
  • ***
  • Posts: 15800
  • Country: fr
Re: Implementing Stereo Volume Control
« Reply #4 on: March 28, 2020, 04:08:09 pm »
Have a look at the PGA2311 chip and its brothers.

Looks pretty fancy and easy to use, but its ~10x the price of the amplifier itself, so I'll take a look at other similar ICs

I've used similar PGA2320 in the past - very good stuff. But yes, a bit pricy.
There's also the CS3310 in a similar vein. Not cheap either.

The LM1972 looks adequate if you're not after ultra-low distortion figures (but it looks already not bad at all, and getting better wouldn't make sense using an IS31AP2110 anyway). One extra thing you get with the 2 above is gain and not just attenuation, but even that you could add for cheap if it were needed here.
 
The following users thanked this post: knapik

Offline glentek

  • Regular Contributor
  • *
  • Posts: 56
Re: Implementing Stereo Volume Control
« Reply #5 on: March 29, 2020, 10:35:52 pm »
I use the m62429 in my car amplifier.
http://nice.kaze.com/M62429.pdf
Easily controlled by arduino. You can buy a prebuilt module from Sure on Aliexpress or ebay, or the chip itself for under $2
http://store3.sure-electronics.com/aa-aa11117
 
The following users thanked this post: knapik

Offline knapikTopic starter

  • Regular Contributor
  • *
  • Posts: 143
  • Country: au
Re: Implementing Stereo Volume Control
« Reply #6 on: March 29, 2020, 10:48:35 pm »
I'll keep that in mind for any future revisions/projects. Does seem about 1/2 the price of the lm1972 and it includes the buffers on the IC.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf