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Performant DAC system + battery powered clock board as modification kit for Asus Xonar ST/STX sound cards.


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Completely and modular high quality DAC, and battery powered clock board, as a kit modification for Xonar ST/STX sound cards.

The DAC system is based on the same PCM1792 chip, but is entirely redesigned, and interfaced through optical isolators to I2S lines on ST/STX board. Double regulation levels using TPS and ADM7151 ultra low noise regulators on DAC board. The fully differential (OPA1632) I/V and final buffer are also powered by TPS ultra low regulators dedicated to every opamp chip on board. Independent PSU using R core transformer, with AC main filter. This DAC system is completely electrical isolated from the rest of the computer.

The stock clock oscillators on original ST/STX board are replaced by NDK/Connor-Winfield ones, which are powered from battery. The battery provide power for more than 40 hours continuous functioning (charging while the system is powered off). The clock board is damping mounted to completely prevent any mechanical vibrations from the rest of the host computer. Power up/down management included.

Balanced outputs (XLR) as standard (right and improved AC coupling approach), but RCA are also available if necessary.

The modified board it need two PC slots available for the board, and one PC slot free for installing the output connectors (6,2 mm headphone jack type). The sound card it still fully functional in its original design. The new added DAC system it works in parallel with the original one. For implementing this mod, it is necessary sending in the original board. Then all the system is fully plug and play. The DAC`s PSU it need to be always connected to a wall main AC connector.

The performances of the system are just exceptional.

XonarSTXmodFINAL.jpg

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