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 Post subject: isolating Audio Interference
PostPosted: Sat Nov 26, 2016 9:21 pm 
Joined: Sat Nov 19, 2016 1:36 pm
Posts: 7
Hi;

I have just done the first full test of the audio output for my Car PC.

For sound output I am using the 3.5mm audio out of my Raspberry Pi (which is fitted to an official 7 Inch Touchscreen). The audio out is hacked into the L and R Audio out of the Radio Module my Pioneer DEH-1600R radio as well as using one of its Gnd points.

The problem I am having is a lot of noise interference through the speakers and need some help sorting it out.

The issues might be the Gnd that I used, I used DGND and not BEGND (I did this as there was more room??)

I don't have an aerial fitted (not sure if that will make a difference as it is supposed to cut out the radio when the aux is active?), or something else?

Any help would be great.

P.S. My blog showing my build can be found here:

[/url]https://picodeandchips.wordpress.com/blog/[/url]


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 Post subject: Re: isolating Audio Interference
PostPosted: Fri Dec 02, 2016 8:03 pm 
Joined: Thu Sep 22, 2016 12:24 am
Posts: 57
The 3.5mm jack on Raspberry Pi's is terrible. It doesn't use a DAC, so interference and the like is rampant. try a USB sound card.


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 Post subject: Re: isolating Audio Interference
PostPosted: Fri Dec 02, 2016 10:19 pm 
Joined: Sat Nov 19, 2016 1:36 pm
Posts: 7
arusia wrote:
The 3.5mm jack on Raspberry Pi's is terrible. It doesn't use a DAC, so interference and the like is rampant. try a USB sound card.


Ye I was considering a DAC Hat fro the Pi or USB as you suggest. I have now switched to hacking into the CD audio lines and playing a CD with silent tracks works fine but still a little ground noise but much easier to deal with.
I may try a Ground Loop Isolator on the audio line from the Pi to the radio as well as getting DAC later.


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