Experience with this DIY DAC ?

[gabrielbecheanu]

Hi
No one can help me to fix this problem with 24/192 playback files? What should i change to use this DAc with 24/192?
Best regards

[prairiemystic]

It's been a while since I dug into this board.

For 192kHz/24bit, you can run this only if you are using the CS8421 up-sampling (ASRC) option board. Then the CS4398 pcb dip-switch positions should be UP,DWN,DWN,DWN (Note UP is actually off=0, and down is on=1)

Without the up-sampling board:
The USB input chip PCM2902 is good for 48kHz max.
The DIR9001 is max. 96kHz and the CS8416 depends on the version of this DAC you have. I'm not sure this DAC in stock form can take 192kHz SPDIF input.

Beyond this, I have some V2, V3, V5 manuals/schematics.

[gabrielbecheanu]

Hi
In the attachment is my DAC

Best regards

[jayce996]

Hi everyone,
i'm looking at a cheap DAC built or to build, able to work with the Squeezebox Touch where i've enable the USB output and the 192khz/24bits.
is this one working well with the Touch, is it the best choice?
thank you for your help

[prairiemystic]

Gabriel, from the picture, your DAC board version LM-2D does not have the headers for the ASRC upsampling option board, which is needed for 192kHz operation (see attached pic of a version LM-3 DAC with vertical ASRC card).

Although the chips can do 24bit/192kHz, it's a bit of false advertising- you have to do mods to get your board to take 192kHz input. Even then, the stock op-amps (NE5532's) are not well-suited for DAC filters and they sound awful here- a limiting factor.

[gabrielbecheanu]

prairiemystic I use LM4562. Before to put in on the case i want to fix it, i would like to play 24/192 from this DAC but i don`t knpw how to fix it.
Thanks

[kec]

I still have the same issue, can't play 192k files when the upsampling board is plugged in. If I pull the board and put the jumpers back it works, but then I loose upsampling capability on <192k files. Is it due to the wrong PLL values on the CS8416?

I believe I have the last version of the board. I am bypassing the op amps and using transformers.

[Extreme_Boky]

there's no need for upsampling with 192k signals

with <192k, DAC chip will upsample to 192k if no upsample board is used

with <192k and upsample board used, DAC chip will not do any upsampling; upsample board will supply 192k to DAC chip

Boky

[kec]

Thanks for the reply Boky.

So, there are 2 methods to upsample, one using the module and one with the DAC chip?

[Extreme_Boky]

Yes, you can not bypass CS4398 oversampling modes:

"4.4 Oversampling Modes:

The CS4398 operates in one of three oversampling modes based on the input sample rate. Single-Speed mode supports input sample rates up to 50 kHz and uses a 128x oversampling ratio. Double-Speed mode supports input sample rates up to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed mode supports input sample rates up to 200 kHz and uses an oversampling ratio of 32x."


Boky