[NBLUG/talk] a problem with audio noise

[jezra]

Although I don't have an oscilloscope, I do have a box of electronic
components, and I'll try Frank's suggestion of using a capacitor.
However, when it comes to electronics, I know just about nothing, so I
don't know what sort of capacitor to use for this.



On Thu, 30 May 2013 13:13:45 -0700
Mitch Patenaude <patenaude at gmail.com> wrote:

> Analog is much trickier and more finicky than digital electronics.
> 
> One problem is that you might be creating a ground loop by connecting
> the ground (common) both at the IO pins and audio in.  You might try
> removing the ground from one of those, or powering the amp some other
> way entirely (at least as a test.)
> 
> As Frank suggested, a cap on the power line may help with some of the
> ripple that may be coming through.  If you have an oscilloscope, you
> can check the power pin for ripple.
> 
>   -- Mitch
> 
> 
> On Thu, May 30, 2013 at 12:30 PM, jezra <jezra at jezra.net> wrote:
> 
> > In my current computer project, I have a small audio amplifier
> > connected to a small SBC (Single Board Computer), and the amp is
> > also getting power from IO pins on the SBC. When everything is
> > powered up, there is a lot of staticy background noise coming from
> > the amp, and I was wondering if anyone had a suggestion for ways to
> > reduce the noise?
> >
> >
> > Jezra
> >
> > Web: http://www.jezra.net
> > Status: http://status.jezra.net
> > Coffee: http://coffee.jezra.net
> > _______________________________________________
> > talk mailing list
> > talk at nblug.org
> > http://nblug.org/cgi-bin/mailman/listinfo/talk
> >