I am getting background noise all the way from output of DAC and hearing it in my headphone.
My connection is as follows:
DAC(PCM1789) --> LPF/ audio amplifier(TPA6138)
How can I eliminate the background noise? Attached is schematic
The noise seems to originate from the DAC and the LPF does not suppress it.
some information,
- the background noise is there at the output of DAC all the way to the headphone, that is, when no audio is played on PC
- when I make PC volume low, the noise is reduced and I can hear clearer audio/music
- when I increase PC volume, the noise is also increased such that I cannot hear audio
- created seperate power supply for LPF/amplifier thinking it may have come from power supply or breadboard
- the DAC to LPF/amplifier is connected using breadboard wire
Mods edit:
Please post the circuit as 800x600 *.jpg or *.gif file, many of members may not open the pdf to see the contents.
My connection is as follows:
DAC(PCM1789) --> LPF/ audio amplifier(TPA6138)
How can I eliminate the background noise? Attached is schematic
The noise seems to originate from the DAC and the LPF does not suppress it.
some information,
- the background noise is there at the output of DAC all the way to the headphone, that is, when no audio is played on PC
- when I make PC volume low, the noise is reduced and I can hear clearer audio/music
- when I increase PC volume, the noise is also increased such that I cannot hear audio
- created seperate power supply for LPF/amplifier thinking it may have come from power supply or breadboard
- the DAC to LPF/amplifier is connected using breadboard wire
Mods edit:
Please post the circuit as 800x600 *.jpg or *.gif file, many of members may not open the pdf to see the contents.
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