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Old 16th May 2008, 03:55 PM   #741
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Hi Tripathdude,

if I may .... you won't want any DC across the transformers, but I'm guessing there will be a DC blocking cap in the Promitheus buffer, in which case you could hook it straight up to the output of the Sabre DAC. I'd suggest getting in touch with Promitheus to check.

The Promitheus is a voltage buffer, so needs a voltage input. The Sabre chip can work as voltage or current out, but gives better performance with current output, technically at least.

Dan
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Old 16th May 2008, 05:47 PM   #742
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Quote:
Originally posted by chalkandtalk
Russ: I note that Twisted Pear no longer has any Joshua Trees. I will be ordering a Bufalo DAC as soon as I can but need a vol control.

Will you be offering a way to control the volume digitally soon?

cheers

Aidan

JTs will be available soon, as well as a way to control the Buffalo volume. So you could go either way.

Cheers!
Russ
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Old 16th May 2008, 09:17 PM   #743
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RUSS

Just received a brand new Denon-1920 for a just incredible price!
Unit is an open box item, no cosmetic or electrical functional defects.
I will be ordering Buffalo boards for the Denon update.

Merlin
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Old 19th May 2008, 01:04 AM   #744
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Default Power up and down timing sequence

This may be a(n) R T F M question, but I don't have the full datasheet on hand.

Question for Dustin:

Could a slower startup of the analog supplies cause any harm to the chip? And conversely, would power remaining on to the analog section after digital powerdown, for instance from residual charge in bypassing, cause any harm to the chip?

I'm looking into a separate 3.3V supply for the analog section, not derived from the digital 3.3V supply, or a much lower time constant filter from the digital supply to the analog supply buffers.

Early futzing and listening shows considerable promise. Excellent phrasing and timing, PRAT on the UK/Euro side of the puddle. Tight, deep, articulate low end. Pinpoint L/R imaging. Piano is sounding really good. Working on liquid textures and front to back dimensionality to match.

Thanks,

WMS
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Old 19th May 2008, 09:59 AM   #745
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WMS

Is that a "Teddyreg" (VBE multiplier?) psu you're experimenting with?

I have been having similar thoughts but haven't built one yet.

Mark
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Old 19th May 2008, 02:27 PM   #746
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Got my package today, you have one very very happy man here
The boards are simply amazing, I have friends working in the industry and they are very happy with the quality too, delivery to this end of the world was simply lightning fast and yes, it is spam but please let me thank Brian and Russ for making me truly happy. Thanks again guys, I will post on the results very soon, please be patient as I am not at your level of expertise.
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Old 19th May 2008, 02:37 PM   #747
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Russ or Brian,

Any news on when the next modules will be available and how to get on the list? I will be off globe trotting in a month or two and won't be able to build for at least a year. I need a Buffalo kit including trans and IVY.

In regards to the Denon DVD-1920, will the 1930 and 1940 be the same player with a few changes, or is the 1920 diferent inside? I know that with the 3910, 3920, 3930, and so on that there were very little changes with the hardware. Most of the evolution onthese units is software based.
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Old 19th May 2008, 03:47 PM   #748
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Quote:
Originally posted by khundude
Russ or Brian,

Any news on when the next modules will be available and how to get on the list? I will be off globe trotting in a month or two and won't be able to build for at least a year. I need a Buffalo kit including trans and IVY.

In regards to the Denon DVD-1920, will the 1930 and 1940 be the same player with a few changes, or is the 1920 diferent inside? I know that with the 3910, 3920, 3930, and so on that there were very little changes with the hardware. Most of the evolution onthese units is software based.
No news yet. Brian and and I are working hard to work in some design tweaks based on test data we are receiving. Stay tuned.

I don't have any other Denons to look at right other than a DVD-2910 and a DVD-1920. So I can't really answer that question.

Between the two players the DVD-1920 looks much easier to mod.

Cheers!
Russ
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Old 19th May 2008, 04:06 PM   #749
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Hi Russ,

Has Dustin measured it then? How's it looking?

My 2p, for what it's worth, would be to add a reg (perhaps a filtered opamp similar to the analogue 3.3V supply) for the clock. Anyway, hope you are having fun!

Cheers,
Dan
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Old 19th May 2008, 04:14 PM   #750
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So far only the IVY has been tested. But Dustin's initial remarks are generally very positive.

Preliminary IVY numbers DNR ~ 133dB THD ~ -115dB performance was pretty equal between the balanced and single ended outputs.

Cheers!
Russ
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