EXPIRED: R2R dac bare board with SPDIF and IIS input

[MarkLSF]

Further information:

0.1% resistor, dimension:  140*87mm, requires AC 15-0-15 V and an AC 9V, SPDIF and IIS input selected by onboard jumper, support up to 24bits/192khz

I have tested the board and make sure it is working fine, it gives very natural and musical sound. 
Photos:

 

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[Soundfever]

How do you use this board? Raspberry pi?

[MarkLSF]

15 hours ago, Soundfever said:

How do you use this board? Raspberry pi?

I connect the power and SPDIF coaxial, also have tried connecting via i2s from my raspberry pi HAT

[Soundfever]

thank you.