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Old 13th November 2008, 02:33 PM   #1
Stuw is offline Stuw  United States
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Default spdif to analog converter circuit

I am just starting to educate myself in the vagaries of digital sound. The purity of the sound is not that important at this time as I am almost deaf. However, I have a use for a mono Spdif to analog converter. I want to build it and experiment with it. After doing quite a bit of Googling on the subject, it seems that these DAC chips require a PC connection for timing etc.
My question is, "Is there a way that a circuit could be built that would be stand alone and if so, does anyone out there have a circuit?". I am rather good at building and I enjoy it. In other words, I want to plug the spdif in and connect the output to an analog amplifier. I know I can buy a Gefen converter etc. etc. but I want to build it myself.
After doing my Googling on this subject, I guess I'm too old to grasp it myself and I need some assistance to get me started.
Thank you in advance for any help.
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Old 13th November 2008, 05:57 PM   #2
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SPDIF is a digital interface for DAC's. The chain is Source (CD, DVD or Computer) to a DAC via a SPDIF data standard to a preamp to your amp.

A DAC is a spdif to analog converter.

There are tons of great DAC's like the Lavry Engineering DA-10 for $995, Logitech/SqueezeBox Transporter $1995 (Transporter also have ethernet interface to a computer), to DIY options.

A great DIY option is either an AKM 4396 DAC eval board or the Analog Devices AD1955 eval board. All you need a powersupply and a case. These eval boards are absolutely first rate.

Given your hearing impairment the SqueezeBox SB3 or even a Roland Enderol UM-1.

Other members may have better ideas.

-David
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Old 13th November 2008, 08:20 PM   #3
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Perhaps an ezDAC?
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Old 13th November 2008, 08:30 PM   #4
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If u want diy:


http://focus.ti.com.cn/cn/lit/ug/sleu024a/sleu024a.pdf


You don't have to buy the eval board; just make your own from the supplied artwork & buy only he chip from TI.
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Old 19th November 2008, 03:31 PM   #5
Stuw is offline Stuw  United States
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Question Thanks

Steerpike, when I went to the web site, it was in Chinese. If you could give me the chip number, I could search on it. It sounds like what I have been looking for.

Thanks for the replies. This site and all who help are astounding!!!
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Old 19th November 2008, 05:43 PM   #6
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Dang, they moved that document so my URL stopped working.
I re-found it here:

http://focus.ti.com/docs/toolsw/fold...m-pcm2902.html

look for this part, and download the sleu024A.pdf file (N.B. "A" suffix):
"User Guides
* DEM-PCM2900/2902 EVM (Rev. A) (sleu024a.pdf, 616 KB)
29 Mar 2007 Download"


The PCM2902 does have a USB computer port, but I think you don't have to use it - i'm not exactly sure of the modes of operation - the data sheet will tell you that.

If you're a student, you dont even have to buy the chip, TI will GIVE you one free. They are really great that way.
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Old 19th November 2008, 06:31 PM   #7
paulb is offline paulb  Canada
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Quote:
Originally posted by dw8083
A great DIY option is either an AKM 4396 DAC eval board or the Analog Devices AD1955 eval board.
The AD1955 eval board is $600US, the AKM about $300. These are pretty expensive for someone whose hearing isn't that good.
These are cheaper:
http://us.hifidiy.net/list.asp?classid=15
Check out the Mini TDA1543 at $42.00. Also, it is a real kit that has to be assembled, which I think is more what Stuw had in mind.
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Old 20th November 2008, 03:16 PM   #8
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Quote:
Originally posted by paulb

The AD1955 eval board is $600US, the AKM about $300. These are pretty expensive for someone whose hearing isn't that good.
These are cheaper:
http://us.hifidiy.net/list.asp?classid=15
Check out the Mini TDA1543 at $42.00. Also, it is a real kit that has to be assembled, which I think is more what Stuw had in mind.
Hi Paul,

I have not checked prices for these boards lately. Prices keep going up. Going back 2 years the AD1955 board was either $195 or $225, depending upon the distributor. I did hear from one vendor that the DIY community was snatching up these boards based on feedback on this site and had to raise prices. They were selling the boards under cost as demo samples.

If you are lucky enough to work for an electronics or audio company of some type, you can probably request one for free for eval purposes.

-David
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Old 20th November 2008, 05:31 PM   #9
Stuw is offline Stuw  United States
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Default Thanx for everything

Thanx so much for all of the replies. I now have a whole bunch of data to investigate. I also found an interesting article at the following url http://ta2020.huuryuu.com/nosDAC_e.html.
This s/pdif is quite a fascinating subject. I feel I am in school again.

Again, Thanx a lot. I will post pix of my completed project in the future.

You all should be proud of this site & all you do.

Stuw
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Old 21st November 2008, 11:11 AM   #10
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Stuw - what is your source for the SPDIF? What type of cable - Coaxial or Optical?
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