It is the holiday season, so for those still not familiar with Audial devices’ sound qualities, but with some time and will to solder, here is the idea on how to use them. The result might be both good sound, and a better understanding of audio issues.
So, here is the output stage of AYA II DAC, released back in 2007, now with details of the circuit behind the originally posted block diagram.
Overall, it lacks the ultimate linearity of output stages used in the Model series and Gramofone DACs – Audial latest no compromise I/V circuit distortion figure, when used with PCM1704K, went below 0.0005% (-110 dB, and no feedback, yup) – but subjectively it still fares really well. OPA861 internal circuit is for this purpose almost unbeatable diamond architecture, with the benefits of on-chip transistor matching. In fact, its sonic properties still could outperform any other published I/V circuit, as also found by some devotees earlier, when AYA II was available as an offline DIY project, namely by Elso Kwak and by Hen-Hsen Huang.
The circuit as such is intended for use with TDA1541(A), but it should be pretty easy to accommodate it to any other D/A chip. It is well-proven for its operation reliability, and this document’s data should be sufficient too. However, please be kind and note that currently we can not really support DIY endeavors, and consequently we probably won’t have time to address any questions you might have on this matter.
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