XMOS-based Asynchronous USB to I2S interface - Page 7 - diyAudio
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Old 16th August 2011, 04:28 PM   #61
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Location: London
Default Audio Note 2.1

@carlmawer

You would need to use the SPDIF off this board for a 2.1 unless you convert native I2S to what the AD1865 Dac Chip in your Audio Note needs to see.

The Hagtech is, by todays standards, a pretty crude device and will be exceeded by a huge margin by many options.

I have a 2.1 myself and ditched the HagTech some time ago. PM me if you want more info we are heading way off topic here.......
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Old 21st August 2011, 05:19 PM   #62
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Default Clock consideration...

Hi Lorien,

If you are still doing a board rev, you might want to consider Crystek:

CCHD-957 series oscillator modules. Expensive, yes, but lower phase noise than anything I am aware of (short of ovenized $300 parts).
This new series comes in 22.5792 and 24.576. They need a little more board space, but power consumption and voltage (3.3 and ~25 mA) seem in line with many other modules.
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Old 21st August 2011, 07:27 PM   #63
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Hello guys,
sorry for this long silence and late reply! I was on a few days trip across Europe... but without any internet connection at my disposal :|
Thank you barrows for informations! I know about CCHD-957 oscillators but for now they are a bit overpriced to me and I want to keep the costs down for this second revision. Besides that, I must keep an eye on the total power consumption via USB bus since I'm at the higher limit of USB specs. I'm more and more convinced that I should leave the USB PSU option aside...

Kind regards,
L
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Old 22nd August 2011, 01:04 AM   #64
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Default Hi

Quote:
Originally Posted by Lorien View Post
Hello guys,
sorry for this long silence and late reply! I was on a few days trip across Europe... but without any internet connection at my disposal :|
Thank you barrows for informations! I know about CCHD-957 oscillators but for now they are a bit overpriced to me and I want to keep the costs down for this second revision. Besides that, I must keep an eye on the total power consumption via USB bus since I'm at the higher limit of USB specs. I'm more and more convinced that I should leave the USB PSU option aside...

Kind regards,
L
Lorien,

I would encourage you to ditch USB bus power alltogether. My experience with both both USB-SPDIF and USB-I2S interfaces has always shown a marked improvement with a decent external supply. I feel anyone who is going to use your board would want the best possible performance, and supplying the necessary clean DC is not a big deal. Right now I am experimenting with a USB-I2S board I got from a friend, and with a filtered/regulated 5 VDC LiFePO4 battery supply it sounds really good, but there is minimal onboard regulation on this board-I am sure your would be much better, and I am looking forward to your next revision.
Please let us know when the next version is ready, as I will probably be ready to purchase at that time.
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Old 22nd August 2011, 06:09 AM   #65
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Quote:
Originally Posted by barrows View Post
Lorien,

I would encourage you to ditch USB bus power alltogether. My experience with both both USB-SPDIF and USB-I2S interfaces has always shown a marked improvement with a decent external supply. I feel anyone who is going to use your board would want the best possible performance, and supplying the necessary clean DC is not a big deal.
I would also prefer external supply to usb power. While not having played with a usb source for audio (yet) I'd much rather keep the power to any digital circuits as clean as possible.
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Old 24th August 2011, 03:33 PM   #66
drlau is offline drlau  Hong Kong
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Hello, where can I buy this board?
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Old 26th August 2011, 05:08 AM   #67
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Quote:
Originally Posted by drlau View Post
Hello, where can I buy this board?
Contact Lorien !
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Old 2nd September 2011, 07:09 AM   #68
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Hello guys,
there is some progress related to the second board still, one unfortunate incident bound me to the bed for a while thus I'll need some time until I'll be fully recovered. Given this and the growing demand for this WaveIO card, I've ordered few more from the old batch of boards while I'll continue to work on this new revision.
Best wishes to all,
L
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Old 2nd September 2011, 07:31 PM   #69
reo is offline reo  Canada
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Happy that you are back on your 2 feet .
Rol
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Old 13th September 2011, 08:22 PM   #70
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Quote:
Originally Posted by hochopeper View Post
I would also prefer external supply to usb power. While not having played with a usb source for audio (yet) I'd much rather keep the power to any digital circuits as clean as possible.
x2

do not want bus powered, I only want to use external PSU, in fact most everyone wanting the sq that the WaveIO card can provide would expect to use an external PSU
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