[NBLUG/talk] a problem with audio noise

jezra jezra at jezra.net
Thu May 30 14:12:53 PDT 2013


I'll see what I can find in my box of electronics.

On Thu, 30 May 2013 13:57:26 -0700 (PDT)
Mike Rice <kf7vzz at gmail.com> wrote:

> Also try wrapping the supply line around a ferrite core. This should
> smooth some of it out. 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> C. Mike Rice
> 
> 
> 
> ________________________________
>  From: Mitch Patenaude
>  
> 
> 
> 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
> >
> 



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