The Best DAC is no DAC

More pics with & without USB connected.
 

Attachments

  • 17191410511398428672133310974623.jpg
    17191410511398428672133310974623.jpg
    272.1 KB · Views: 51
  • 1719141083771710167705786383812.jpg
    1719141083771710167705786383812.jpg
    345.8 KB · Views: 47
  • 17191411295231189945280192423018.jpg
    17191411295231189945280192423018.jpg
    269.1 KB · Views: 47
  • 17191412130193758519631008993502.jpg
    17191412130193758519631008993502.jpg
    345.3 KB · Views: 47
Changed player to no convert PCM to DSD, scope pic without music, probe x1
 

Attachments

  • 17191417524581551630993268899253.jpg
    17191417524581551630993268899253.jpg
    268.3 KB · Views: 50
  • 17191417317657616331233345079616.jpg
    17191417317657616331233345079616.jpg
    318.4 KB · Views: 42
  • IMG_20240623_132121.jpg
    IMG_20240623_132121.jpg
    269.2 KB · Views: 42
  • Screenshot_20240623-131915.png
    Screenshot_20240623-131915.png
    58 KB · Views: 47
To measure frequency with that type of scope, the knob in the lower right corner labeled "Var" has to be fully counterclockwise to the position that is labeled "Cal"

Then the time "Timebase" switch will be in the calibrated condition and we can use it to calculate the frequency of the displayed waveform.

(However, if the "Var" knob is got loose and slipped out of position, it should just be fully counterclockwise.)
 
Okay. 1 cycle takes approximately 2.4 divisions. So we need to calculate 1/( 2.4 x 10 us) which gives a frequency of approximately 41.666kHz. Of course the scope sweep rate calibration may not have been checked recently so it could be a little (or a lot) inaccurate. However, since your DVM is supposed to be good up to 200kHz, it might be reasonable to try measuring with it to compare with the scope measurement.
 
Okay. Looks like it the 44.1kHz LRCK frame clock for CD audio. That's probably what the USB board defaults to. Are you sure you are counting the pins as Amanero does? If you count from the wrong end you might end up on the wrong pin or something. The way I check is too look for three pins all next to each other that have DATA, BCLK, and LRCK (or FSCLK).

1719152324071.png


In Amanero pinout format, the pin in the pic above labeled "FSCLK" is the same as LRCK, its the frame sample rate clock. It should be the one at 44.1kHz