Electronics > Projects, Designs, and Technical Stuff
Implementing Stereo Volume Control
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knapik:
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.
Messtechniker:
Have a look at the PGA2311 chip and its brothers.
knapik:

--- Quote from: Messtechniker on March 28, 2020, 06:50:35 am ---Have a look at the PGA2311 chip and its brothers.

--- End quote ---

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
knapik:
The LM1972 will probably do the job, so thanks for the help there.  :-+
SiliconWizard:

--- Quote from: knapik on March 28, 2020, 07:03:55 am ---
--- Quote from: Messtechniker on March 28, 2020, 06:50:35 am ---Have a look at the PGA2311 chip and its brothers.

--- End quote ---

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

--- End quote ---

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.
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