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Buffalo DAC (ESS Sabre 9008)

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F

fmak

Member
Joined 2001
Russ/Brian

There may be an issue with LCDPS powered at 12V ac driving the Buffalo at 192k. I use it as a preregulator feeding an ALW regulator at 11.5V. However, at 192k playback, regulation is inetermittantly lost due perhaps to higher current than atticpated thru the R-LR network.

I shall have a look at the Rs associated with the LM317 later.
 
Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
fmak said:
Russ/Brian

There may be an issue with LCDPS powered at 12V ac driving the Buffalo at 192k. I use it as a preregulator feeding an ALW regulator at 11.5V. However, at 192k playback, regulation is inetermittantly lost due perhaps to higher current than atticpated thru the R-LR network.

I shall have a look at the Rs associated with the LM317 later.
Click to expand...

You probably have too much current for the voltage drop accross R1-4 with your 12V secondaries.

You should either jumper those Rs or use a smaller value say 1-2 ohms based on your transformer.

12VAC secondaries with 11.5V output is not that much headroom.

Cheers!
Russ
 
F

fmak

Member
Joined 2001
Russ White said:


You probably have too much current for the voltage drop accross R1-4 with your 12V secondaries.

You should either jumper those Rs or use a smaller value say 1-2 ohms based on your transformer.

12VAC secondaries with 11.5V output is not that much headroom.

Cheers!
Russ
Click to expand...

Yes, about 100 mA for Vdd. I was going to try 6-8 Ohm.

Russ, do you know if Buffalo/Ivy balanced inverts phase?

Fred
 
W

woodturner-fran

Member
Joined 2006
Russ,

got the email and well set to work on it. I ordered the stuff from mouser anyway as the $$ were starting to seriously mount up!! Anyway I need to order more stuff early in Jan for a new phonoclone build and also some ALWSR regulators.


For those who are using a "super" regulator like jung/ALWSR/teddyreg - are all of you using the LCBPS/DPS as the input voltage? I'm just wondering if a simple CRC filter before the super reg would be better?

Whats the collective wisdom on this? I can tell you that I am using the LCBPS/teddyreg combo and it does sound great.


Fran
 
F

fmak

Member
Joined 2001
woodturner-fran said:
Russ,


For those who are using a "super" regulator like jung/ALWSR/teddyreg - are all of you using the LCBPS/DPS as the input voltage? I'm just wondering if a simple CRC filter before the super reg would be better?

Whats the collective wisdom on this? I can tell you that I am using the LCBPS/teddyreg combo and it does sound great.


Fran
Click to expand...

The ALW regulator with prereg sounds considerably more transparent (and better).

There is no measurable advantage to using the teddy prereg and one disadvantage. The 317/337 prereg offers some protection; there is none with the teddy prereg which also takes time to charge up. There is also no rationale for having a preg stage which is quieter than the supreg stage (about 3 uV wideband as opposed to 6 uV).
 
Joshua_G

Joshua_G

Member
Joined 2008
gomeh.com/
fmak said:


There is no measurable advantage to using the teddy prereg and one disadvantage. The 317/337 prereg offers some protection; there is none with the teddy prereg which also takes time to charge up. There is also no rationale for having a preg stage which is quieter than the supreg stage (about 3 uV wideband as opposed to 6 uV).
Click to expand...


Do you mean that LCDPS/BPS are quieter than the teddyreg?
 
S

Spartacus

Member
Joined 2002
I found the following rather confusing ...

The ALW regulator with prereg sounds considerably more transparent (and better).
Click to expand...

Better than what?

There is no measurable advantage to using the teddy prereg and one disadvantage.
Click to expand...

Compared to what?

The 317/337 prereg offers some protection; there is none with the teddy prereg which also takes time to charge up.
Click to expand...

Protection form what? Plus the teddyreg uses an LM317.

Why the 337? It's negative.

What relevance does charging time have?

Any clarification appreciated.
 
Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
Fmak,

I appreciate your report and effort.

I think your regulator conversation is interesting, but honestly its probably best to give discussion of any particular power supply and your subjective review its own thread. I am sure there are interested folks, but it's not really on topic for our thread which is supposed to focus on our particular project.

So since this is our vendor thread I respectfully request that such topics be moved to their own threads so they can get the focused attention they deserve. I will be happy to join in the conversation there. This will keep this thread better focused.

I am not trying to squelch discussion, just trying to keep things in perspective and on topic.

Happy Holidays!

Thanks!
Russ
 
L

LTK

Member
Joined 2003
Russ White said:


Hi Fran, sent it to the email address I had. I hope you got it. :)

Leo has already started testing his proto Counterpoint. He built it in record time. :)

Cheers!
Russ
Click to expand...

Unfortunately I've not had as much time as I wanted, bloody busy with work:bawling:

I did get chance to build it and initial impressions for the Counterpoint are very very promising;)
She's sounding extremely sweet! I think you may have a winner on your hands guys
 
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