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Audio Buzzzzzzz

If you google around, you will conclude the Raspberry Pi does have some noisy analog audio. It's just part of the package. Better than it B+ counterpart, but still not perfect.

 You can do a few things to alleviate the issue.

- Connect the RPi Ground to the Amp's Ground. (Eliminate ground potential). I thought sharing the same power supply was enough, but what I failed to remember is the amp has a boost converter and the Pi has a buck converter; after the step up and step down there might be a difference in ground potential between the two boards. Sharing the ground helps significantly with buzz. If you bought a kit from me, chances are your amp might already have a ground lead going to side buttons for volume up+down. Splice the ground and make this connection, or there should be another gnd on the amp you can plug into.



-Don't use an audio cable, Get an Audio/Video cable with 4 poles. The B+ shares video in the same plug- so a regular audio cable connects both Gnd and Video. This seems to couple noise from the composite video signal even when disabled with HDMI is present.

-Turn the alsamixer volume up higher. 

-Add a ferrite bead clip to your power supply cable and audio cable.


Didn't get a kit from me? These are some alternate solutions.

-Use the same power supply for the Pi and amplifier (aka removing the ground potential).

-Use a shorter audio cable.

-Use a quality (UL listed) power supply.


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