Buffalo II - Page 89

LeonvB · 9th November 2010, 06:32 PM

Quote:

Must ... learn the hard way, I think

If I may requote Russ: "One hint: SOURCE". The code you've written won't work in dual mono mode. You're only controlling the left DAC. The right one has a different address. See:
#define LEFT_ADDRESS 0x90
#define RIGHT_ADDRESS 0x92

Russ White · 07:13 PM

Quote:

Originally Posted by glt

Thanks, Russ.

Wow!. I always trust the datasheet. Must wait to learn the hard way, I think :-)

I am not sure who said anything about trust in the data-sheet.

My advice was to check that the register settings are always what you expect them to be, after all it is your controller that could be changing them. By polling the registers from time to time you can know that all is well and also that some error in transmission or code did not occur. Think of it as a checksum.

Also by checking that they have not returned to their defaults you can see if you had an inadvertent reset. This can happen for a number of good reasons.

Hard way if you must. I prefer preparation.

glt · 9th November 2010, 07:15 PM

Quote:

Originally Posted by LeonvB

If I may requote Russ: "One hint: SOURCE". The code you've written won't work in dual mono mode. You're only controlling the left DAC. The right one has a different address. See:
#define LEFT_ADDRESS 0x90
#define RIGHT_ADDRESS 0x92

Agree. I only have one DAC to control. But for dual mono, all register programming would have to change as well

glt · 9th November 2010, 07:17 PM

Quote:

Originally Posted by Russ White

I am not sure who said anything about trust in the data-sheet.

My advice was to check that the register settings are always what you expect them to be, after all it is your controller that could be changing them. By polling the registers from time to time you can know that all is well and also that some error in transmission or code did not occur. Think of it as a checksum.

Also by checking that they have not returned to their defaults you can see if you had an inadvertent reset. This can happen for a number of good reasons.

Hard way if you must. I prefer preparation.

Good advice. Thanks!.

WDYSUN · 10th November 2010, 03:14 PM

Dear all,

there is any improvement placing a The Metronome ASRC Module between SPDIF and Buffalo?

best
Pietro

Russ White · 10th November 2010, 03:25 PM

Quote:

Originally Posted by WDYSUN

Dear all,

there is any improvement placing a The Metronome ASRC Module between SPDIF and Buffalo?

best
Pietro

None.

The only good reason to use a metronome with the Buf II would be if you needed to convert 48fs I2S to 64fs.

tjencks · 11th November 2010, 02:25 PM

Hi Russ,

I've recently purchased a Buffalo II DAC off of audiogon not realizing you would be changing the XO chip. I guess I really did realize it but somehow it didn't register. Anyway I too man wanted to run dual mono mode. Is there anyway I could send in my Buffalo II and get the XO replaced with the new one for a fee?

In addition would there perhaps be any benefit in replacing the current clock with something like a Dexa Neutron Star? Is it even possible to use an external clock with your board?

Best Regards,
Theo

BrianDonegan · 11th November 2010, 02:34 PM

Quote:

Originally Posted by tjencks

I've recently purchased a Buffalo II DAC off of audiogon not realizing you would be changing the XO chip. I guess I really did realize it but somehow it didn't register. Anyway I too man wanted to run dual mono mode. Is there anyway I could send in my Buffalo II and get the XO replaced with the new one for a fee?

Already answered: Buffalo II

tjencks · 11th November 2010, 03:23 PM

Thanks Brian,

So I guess that is a no. What about using an external clock...would there be an advantage or a why to use an external clock?

Best Regards,
Theo

jgazal · 11th November 2010, 07:28 PM

@Theo

I am not an expert, but I believe special care was taken to keep clock and power regulation very near to the pertinent circuits.

Although better external clock references might be available (not so sure if better power regulation), it seems crucial to keep the signal away from interferences.

Keeping paths/rails as short as possible seem to play a more significant role than just the clock deviation inherited from its reference source (as long as you have a good enough crystal, which is the case with Buffalo II and even if your external reference is the most stable reference, like an atomic clock...).

Ok, I might be over exaggerating with atomic clocks.

@ twisted pear

Is that right?

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10th November 2010, 03:14 PM	#885
WDYSUN diyAudio Member Join Date: Apr 2009 Location: Southern Italy - London (UK) - Philadelphia (US)	Dear all, there is any improvement placing a The Metronome ASRC Module between SPDIF and Buffalo? best Pietro

11th November 2010, 02:25 PM	#887
tjencks diyAudio Member Join Date: Feb 2009	Hi Russ, I've recently purchased a Buffalo II DAC off of audiogon not realizing you would be changing the XO chip. I guess I really did realize it but somehow it didn't register. Anyway I too man wanted to run dual mono mode. Is there anyway I could send in my Buffalo II and get the XO replaced with the new one for a fee? In addition would there perhaps be any benefit in replacing the current clock with something like a Dexa Neutron Star? Is it even possible to use an external clock with your board? Best Regards, Theo

11th November 2010, 03:23 PM	#889
tjencks diyAudio Member Join Date: Feb 2009	Thanks Brian, So I guess that is a no. What about using an external clock...would there be an advantage or a why to use an external clock? Best Regards, Theo

11th November 2010, 07:28 PM	#890
jgazal diyAudio Member Join Date: Dec 2008	@Theo I am not an expert, but I believe special care was taken to keep clock and power regulation very near to the pertinent circuits. Although better external clock references might be available (not so sure if better power regulation), it seems crucial to keep the signal away from interferences. Keeping paths/rails as short as possible seem to play a more significant role than just the clock deviation inherited from its reference source (as long as you have a good enough crystal, which is the case with Buffalo II and even if your external reference is the most stable reference, like an atomic clock...). Ok, I might be over exaggerating with atomic clocks. @ twisted pear Is that right?