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There are some random voices that change with these actions :
1 - micro controller and other processing units cause noise. I mean for example when a certain data transfer happen between digital circuits you can hear it in the speaker.
2 - when I move RCA cable around there is some changes in...
There are 2 RCA connectors : one is located in CODEC board and one in the amp. Each one of these connectors have a jumper . I put these jumper to prevent ground loop . At first I connect only one in the CODEC board and there was noise. Then I connect amp jumper too and still was noise. So right...
Thank you Klaus.
I hope my sketch be good enough :
- - - Updated - - -
I'm sorry. This is more detail of amp circuit that I forgot :
I've shorten all jumpers for GND.
Hi there
I have a situation here regard to the audio amplifier noise.
This is the audio source circuit (CODEC) :
This is the audio amplifier circuit :
And here it is the audio amplifier PCB layout :
There are some facts :
1 - With no input to the amp there is no noise at speakers output at...
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