I have found that the tone board is good DAC from https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-wesiontek-khadas-tone-board-dac.4823/
We have received many email and inquiry where could buy it, welcome to visit Digi-key for purchasing, https://www.digikey.com/products/en/embedded-computers/accessories/931?k=Khadas
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