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PCB for PCM2902 (digital out)

Jul 23, 2005 at 9:06 PM Post #121 of 147
Quote:

Originally Posted by halman
I finaly got around to build and house my digital output It feeds my little TDA1545 based thingy very nicely
smily_headphones1.gif


http://www.ljudochteknik.se/Digital3.jpg[IMG]

[IMG]http://www.ljudochteknik.se/Digital4.jpg[IMG]

[IMG]http://www.ljudochteknik.se/Digital2.jpg[IMG][/i]
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oh that's such a cute little case! What brand/model is it, and how much did it set you back?
 
Jul 23, 2005 at 9:46 PM Post #123 of 147
Quote:

Originally Posted by guzzler
Bump with gratuitous Eagle 3D rendering
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pcm2902-a.jpg


I've tidied up the regulator section and taken account of the grounding recommendations.... Silkscreen has component values on. The board is still the same size. If anyone's interested, I can get a batch run out; NO SUPPORT ON IT THOUGH!!

g


Hi! Where you download this program? I not found this in Google
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... May you send to me the Eagle 3d? my email is this: felnavarro@gmail.com

Thanks!
 
Aug 25, 2005 at 3:31 PM Post #125 of 147
Quote:

Originally Posted by halman
Its a hammond 1455C801 I paid around 15usd in Sweden.


How did you decide on that DAC chip. Could you have used a better chip like AD1853 one used in the Benchmark DAC1.
 
Aug 25, 2005 at 6:17 PM Post #127 of 147
Quote:

Originally Posted by BradJudy
It will be interesting to see what comes of this. I own an AA DDE 3 which also has i2s input.



I prototyped an I2S version of the Off-Ramp about a week ago. It uses Superclock3 and I am driving the P-3A I2S input. It is the best computer sound that I have ever heard. About 10-15% better than the Off-Ramp Turbo with S/PDIF output.

Unfortunately, it is not something that I can currently mod and ship. Too complicated and fragile using the Transit board. I like the Transit better than the 2907 because I can do 24/96 and the drivers bypass Kmixer. I will be starting on a PC board for this converter after the Rocky Mountain Audio Fest in Oct.

Steve N.
Empirical Audio
 
Dec 24, 2005 at 1:59 PM Post #130 of 147
The other day, I scoped the output clock of the pcm2902 (after it had been decoded to I2S in my dac) and it is outputting 44.1 kHz audio

This is with a stock standard install of XP with Foobar set to output via DirectSound v2.0

So by that we could make the assumption that it is indeed bit perfect output and no resampleing is being done by the kmixer ? No need to stuff around with ASIO and kernal streaming then
 
Dec 25, 2005 at 7:01 AM Post #131 of 147
Quote:

Originally Posted by DaKi][er
The other day, I scoped the output clock of the pcm2902 (after it had been decoded to I2S in my dac) and it is outputting 44.1 kHz audio

This is with a stock standard install of XP with Foobar set to output via DirectSound v2.0

So by that we could make the assumption that it is indeed bit perfect output and no resampleing is being done by the kmixer ? No need to stuff around with ASIO and kernal streaming then


I dont think so. I had 44.1 from Foobar as well, but it was going through Kmixer. I installed ASIO for M-Audio and only then did the Windows slider stopped working. Sound was a bit better too.
 
Dec 25, 2005 at 7:03 AM Post #132 of 147
Quote:

Originally Posted by BradJudy
Interesting Steve. BTW: I'll try to keep my eye out for you at the RMAF and say hi.


Brad - the Off-Ramp I2S is complete and in production now. First ones sound amazing driving a P-3A DAC. I will be demoing it at THE Show. San Tropez room 1203.
 
Dec 25, 2005 at 10:29 AM Post #133 of 147
Quote:

Originally Posted by audioengr
I dont think so. I had 44.1 from Foobar as well, but it was going through Kmixer. I installed ASIO for M-Audio and only then did the Windows slider stopped working. Sound was a bit better too.


Ahh yes, the volume slider never worked for me, I just put it down to the fact that it was digital out that it did that (as the analog one using the pcm2702 did have windows volume control)
 
Dec 25, 2005 at 1:57 PM Post #134 of 147
Quote:

Originally Posted by DaKi][er
The other day, I scoped the output clock of the pcm2902 (after it had been decoded to I2S in my dac) and it is outputting 44.1 kHz audio

This is with a stock standard install of XP with Foobar set to output via DirectSound v2.0

So by that we could make the assumption that it is indeed bit perfect output and no resampleing is being done by the kmixer ? No need to stuff around with ASIO and kernal streaming then


I think that DirectSound may do some resampling if you have not the right settings. If I remember well somewhere in windows you have to set the sample rate of DirectSound. Other sample rates played through it are resampled.

WDM or MME drivers are more safe to avoid resampling.
By the way, the output clock of PCM2902 changes according to sample rate, if 32, 44.1 or 48 kHz, as I found from a test that I made time ago:

http://www.diyaudio.com/forums/showt...696#post746696
 
Jan 20, 2006 at 6:12 PM Post #135 of 147
If you have one of these you built and don't use and would like to offload it somewhere PM me with details.

I'd like to add it to a DAC which has coax digital in only so this should fit quite nicely.

Steve

Thanks for PM's guys, all sorted now.

Steve
 
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