Any advance on 16.8mA pp ?
seriously - there seems to be varying info on this.
on the buffalo manual sheet it says
The differential output of the buffalo is 0.924*1.65V (3.1746 Peak)
which I really do not understand. Is that the voltage o/p ?
and can someone explain the connection between 0.924 x 1.65 V and 3.1746. I cannot see any recognizable relationship. it does not seem to be RMS V peak or peak to peak.
by now you may have guessed I cannot find the data sheet on this.
mike
seriously - there seems to be varying info on this.
on the buffalo manual sheet it says
The differential output of the buffalo is 0.924*1.65V (3.1746 Peak)
which I really do not understand. Is that the voltage o/p ?
and can someone explain the connection between 0.924 x 1.65 V and 3.1746. I cannot see any recognizable relationship. it does not seem to be RMS V peak or peak to peak.
by now you may have guessed I cannot find the data sheet on this.
mike
MrMajestic said:
Two toroids and two power supplies. Nothing is stackedI'll post some photos when eveything looks organized inside.
Yeah, keeping the power supply and toroid count low seems to be the key to a clean build.
I'm planning on re-casing my Buffalo when I move to Canada, and also adding a MUX, USB receiver and maybe Counterpoint or IVY II modules. I was planning on having everything on separate power supplies just for sheets and giggles...... but it quickly starts getting insanely complicated
mikelm said:
I don't know where you got "0.924*1.65", in the data sheet is
differential voltage output 3.3V pp, this means in voltage mode.
differential current output 4.224mA pp, this means current mode per channel.
When you send me your email address, I will send you the data sheet, because it is too big for an attachment in this thread.
Andre
Sabre output
OK guys, we have covered this before, but I know its a long thread so I will cover it again.
The analog stage of the DAC is a bunch of switched voltage sources each with a FIXED output impedance.
The DAC output is 0.924 * AVCC peak to peak.
The output has a DC bias of AVCC/2.
The output impedance in stereo configuration is given as follows:
Z = 50k / 64 / 4 = 195.3125
So assuming AVCC = 3.3V you get 16.9ma peak to peak.
The trick to optimal performance is to get the DAC to equally source and sink that current swing. To do that you need to center the input bias of the I/V stage at AVCC/2 to match the DAC output bias. The I/V stage shoudl be as low an input impedance as possible.
Cheers!
Russ
OK guys, we have covered this before, but I know its a long thread so I will cover it again.
The analog stage of the DAC is a bunch of switched voltage sources each with a FIXED output impedance.
The DAC output is 0.924 * AVCC peak to peak.
The output has a DC bias of AVCC/2.
The output impedance in stereo configuration is given as follows:
Z = 50k / 64 / 4 = 195.3125
So assuming AVCC = 3.3V you get 16.9ma peak to peak.
The trick to optimal performance is to get the DAC to equally source and sink that current swing. To do that you need to center the input bias of the I/V stage at AVCC/2 to match the DAC output bias. The I/V stage shoudl be as low an input impedance as possible.
Cheers!
Russ
DaveM said:
OK a small off topic digression into brewing beer.
This stout is a tried and true recipe. Always turns out pretty constantly good.
Only change this time was that I used a bit higher attenuating strain of yeast. I usually get about 6% ABV with the recipe, this time it was about 6.4%.
The result was a bit drier initial taste, but there are enough Dextrins and Carmel malt that it still has plenty of sweetness at the finish. Just enough whole East Kent Goldings to let you know there hops there. The malt does most of the heavy lifting on this brew. Definitely warms you right up.
Most of the roasted caramel malt is of the chocolate variety with a small amount of Belgian Debittered black malt. Some 10 & 40L Carmel malt rounds out the finish. Base malt is all Maris Otter (lots of it).
14 days in the conical fermentor (64deg F) dumping trub on the 8th day.
Keg at 8lbs PSI at 45deg 7days.
Done! Cheers!
Cheers!
Russ
Documentation
Opinions:
1) I'd rather see Russ developing circuits and writing code (or brewing!) than typing!
2) The Twisted Pear Support forum is much more condensed and serves as an effective adjunct to this thread.
3) Nobody around the web is more generous with their time than Russ & Brian - in answering questions and helping to solve problems. In that regard we might be a little spoiled.
Suggestion: It's easy to ask that 'somebody else do it', but this is DIY and the forum exists because of people who are willing to help others. Perhaps we should remember to post (on the TPA support forum, in this case?) any condensed data or non-subjective application information we have found helpful to our own projects.
Frank in Mpls.
fff0 said:
Opinions:
1) I'd rather see Russ developing circuits and writing code (or brewing!
) than typing!2) The Twisted Pear Support forum is much more condensed and serves as an effective adjunct to this thread.
3) Nobody around the web is more generous with their time than Russ & Brian - in answering questions and helping to solve problems. In that regard we might be a little spoiled.
Suggestion: It's easy to ask that 'somebody else do it', but this is DIY and the forum exists because of people who are willing to help others. Perhaps we should remember to post (on the TPA support forum, in this case?) any condensed data or non-subjective application information we have found helpful to our own projects.
Frank in Mpls.
MrMajestic said:
How are you conveying the DSD signal from the Denon to the Buff? I'm thinking of something along the same lines. I assume that you removed the DSD/spdif switch from the board and replaced it with the panel mount switch, correct?
Very nice looking! Mine will, unfortunately, not look anywhere near that good. - Pat
This is not a good idea. The switch actually conveys data, which you would be routing around the case. Also, you would need to switch the #1 dip switch (PCM/SPDIF) and reset the DAC every time you changed the switch.
The board was really designed to be set up for one data type or the other.
Front Panel "Knobs"
Mr. Majestic, if I may ask, where did you get the "knobs" for your front panel? Though I'd like a slightly different overall look, I love that the knobs integrate so nicely with your overall design of the front panel. Do you, or anyone else, know of a source of a more upscale look than the typical round, black plastic knob?
It appears that Front Panel Express can do almost anything with a front panel (thanks for the heads up on that), but I missed any note of knobs. Any suggestions in finding sources of knobs is appreciated.
Larry
Mr. Majestic, if I may ask, where did you get the "knobs" for your front panel? Though I'd like a slightly different overall look, I love that the knobs integrate so nicely with your overall design of the front panel. Do you, or anyone else, know of a source of a more upscale look than the typical round, black plastic knob?
It appears that Front Panel Express can do almost anything with a front panel (thanks for the heads up on that), but I missed any note of knobs. Any suggestions in finding sources of knobs is appreciated.
Larry
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