3 hours ago
I have finished building my ProtoDAC and, well, it plays. No cracks or pops except for really small ones when you change tracks. No audible difference between the left and right channels. The left/right test track also seems to confirm that everything works as it should.
But now to the problem: if you turn down the volume so low that you cannot hear the music (volume max in Moode player, only changing the volume on my headphone amp), I can still hear a ringing sound that goes up and down in frequency repeatedly. It vaguely reminds me of coil whine, but it's not as annoying. Offcourse you can also hear it in not so loud parts of the track, like in the beginging of Bruce Springsteen Thunder Road (Live at the Hammersmith Odeon, London '75).
What is that and how do I get rid of it?
I have tested it with my CD player plugged in to the headphone amp and it is dead quiet
My gear:
RasberryPi 3B+
Stock RasberryPi power supply
Crack OTL Headphone AmplifierÂ
Headphones Sennheiser HD 650
ProtoDAC kit baught from ebay, username, kinkin0000
old CD-player, Sony XA-20ES to test and compare with
previous DAC, SMSL M8, now broken.
But now to the problem: if you turn down the volume so low that you cannot hear the music (volume max in Moode player, only changing the volume on my headphone amp), I can still hear a ringing sound that goes up and down in frequency repeatedly. It vaguely reminds me of coil whine, but it's not as annoying. Offcourse you can also hear it in not so loud parts of the track, like in the beginging of Bruce Springsteen Thunder Road (Live at the Hammersmith Odeon, London '75).
What is that and how do I get rid of it?
I have tested it with my CD player plugged in to the headphone amp and it is dead quiet
My gear:
RasberryPi 3B+
Stock RasberryPi power supply
Crack OTL Headphone AmplifierÂ
Headphones Sennheiser HD 650
ProtoDAC kit baught from ebay, username, kinkin0000
old CD-player, Sony XA-20ES to test and compare with
previous DAC, SMSL M8, now broken.
