On StarDAC PCB the port 38 (ASRC_REF_CLK_IN) of CT7302 is connected to empty large solder pad. I guess the current firmware does not support external clock reference. Are there plans to support precision external clock with later firmware versions?
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Can you elobarate a bit more on the actual conditions of tge output of the Star DAC? Is it voltage or current? Reason i am askibg, i used to use a differential tube output stage with an OPT, so differentials are summed up after tge tubes. For tge sabre, an i/v resistor did i/v, Soekris not even needthat, so currently its a 100k grid to ground resisror for tge tube.
Hi!
I use this Transformer on board. ( the sample image under)
2- if you need the sound thick and more the sample AD1865 sound,
you can use 2 cap 10nF to 15nf to Board (see image)
thanks
quanghao
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Hi QH, to confirm, will it still be able to use the existing Control+LCD Module?
Yes it is possible add an external clock but after many tests I have not found benefits in using another external oscillator.
I have published some measurements.
Why do you think the manufacturer of CT7302 recommends an external reference clock when high quality reproduction is desired (as shown below from their documentation)?
Maybe they don't know what they are doing? Or maybe jitter performance was not among the measurements performed for this DAC design? As you can see I am a bit confused about the apparent contradiction
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Why do you think the manufacturer of CT7302 recommends an external reference clock when high quality reproduction is desired (as shown below from their documentation)?
Maybe they don't know what they are doing? Or maybe jitter performance was not among the measurements performed for this DAC design? As you can see I am a bit confused about the apparent contradiction
This is a common application where we have a normal DAC with MCLK input so in this case a unique master clock is better.
In our case we need to remember that the DSC does not use MCLK.
Got it.
Not being familiar with this DAC, may I ask if it has any particular jitter sensitivity, say, to random close-in phase noise?
DSC2 need DSD input signal so you can play only DSD tracks, to play PCM tracks you need an on-the-fly convertion on the PC with many cpu load.
It is possible configure audio players like Foobar2000, Jriver or HQPlayer to do this job.
Star DAC use the same digital to analog convertion of the DSC2 but there is the chip CT7302PL to convert the signal from PCM to DSD.
This chip can receive also spdif input and integrate a good volume control.
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