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Old 7th March 2013, 05:14 PM   #21
Goto is offline Goto  United Kingdom
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Hi Russ

Great to hear you have found some proper hobby time to bring this project up to date.

If you are providing the option for off-boarding the Audio Master clock, a separate high performance master module with buffered outputs that could run both this device and the Buffalo might be a nice step up.

Thoughts?

Mark
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Old 7th March 2013, 06:35 PM   #22
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Quote:
Originally Posted by francolargo View Post
Any interest in implementing DSP crossover filters?
I would love this facility - this is my long term goal for audio reproduction
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Old 7th March 2013, 06:44 PM   #23
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Originally Posted by mikelm View Post
I would love this facility - this is my long term goal for audio reproduction
I too am interested in trying this, and all I can say right now is maybe.

Certainly you could use this as input to and output from a DSP given the correct conditions.

You could also use an ADC and use your PC as the DSP.

So many ideas, so little free time.
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Old 7th March 2013, 08:28 PM   #24
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Quote:
Originally Posted by Russ White View Post

You could also use an ADC and use your PC as the DSP.

So many ideas, so little free time.
Very true! First things first...

I have no complaints about the quality of the crossover filters that are running in my PC. It just means 3 or 4 stereo USB boards unless an 8 channel version might be offered. ...much more elegant to delegate that job to later in the chain, IMVHO...

All the best for an energizing project, Russ!

Frank
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Old 7th March 2013, 09:52 PM   #25
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Hi Russ

I didn't see an answer to bunpei's question regarding drivers. What's the situation regarding drivers and operating systems?
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Old 7th March 2013, 10:18 PM   #26
Bunpei is offline Bunpei  Japan
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Originally Posted by Russ White View Post
... Anyway - for this source, it's a complete non-issue. The output is not coming directly from the XMOS chip. And the master clock is definitely not generated by it. ...
I'm very sorry for my direct posting. Your answer of full clarification made me feel very comfortable! I believe the approach you choiced will surely bring a good result.
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Old 7th March 2013, 10:35 PM   #27
Bunpei is offline Bunpei  Japan
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Originally Posted by Russ White View Post
... Separate TPS7A47 LDO regulators used on both the USB side and the audio side. ...
May I ask one more?

I guess you must have found a definite advantage of TPS7A4700 comparing to your familiar LT1763 series regulators.
Have you made any fine tuning on the selection of bypass & NR caps used for the regs?
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Old 8th March 2013, 12:43 AM   #28
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Originally Posted by Bunpei View Post
I'm very sorry for my direct posting. Your answer of full clarification made me feel very comfortable! I believe the approach you choiced will surely bring a good result.
No problem. I know you as a reasonable person. I Should have been more specific in my request. Not your fault.

Thanks!
Russ
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Old 8th March 2013, 12:46 AM   #29
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Originally Posted by counter culture View Post
Hi Russ

I didn't see an answer to bunpei's question regarding drivers. What's the situation regarding drivers and operating systems?
I won't be writing any custom drivers just yet, but we will offer the Thesycon driver for windows. For mac (recent OS/X) and most flavors of Linux no special driver should be required.
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Old 8th March 2013, 12:50 AM   #30
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Originally Posted by Bunpei View Post
May I ask one more?

I guess you must have found a definite advantage of TPS7A4700 comparing to your familiar LT1763 series regulators.
Have you made any fine tuning on the selection of bypass & NR caps used for the regs?
Honestly I need to evaluate it further, but on paper it has much lower noise, and better PSRR. I am happy with it so far.

I will be able to report my better tempered results soon.

I expect it will perform quite well. From a design perspective, it is a nice part to use because it is simple and easy to configure for multiple projects. It has a ton of up-side. I think TI did a nice job with this one.

Cheers!
Russ
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