Pushing the limits of TDA1543 NOS DAC - Page 5 - diyAudio
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Old 28th April 2011, 02:19 PM   #41
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Quote:
Originally Posted by le´flu View Post
Just because i´m curious, Peter at post 24 what for is LED
S1 S2 and p on the front?
I want it to make it look a bit more fancy, so I added those LEDs; they indicate sources and phase.
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Old 28th April 2011, 03:52 PM   #42
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The transformer will also lower the impedance seen by the chips. Being Iout, they really want to see 0 ohms.

In the balanced config with transformer, the Iout of each chip will see the parallel between the resistor and 1/2 of the reflected impedance on the primary. It´s quite easy to see they will be happier that way than if they were seeing the usual 1K or more.

And then there´s the filtering effect of the transformer which comes in handy with non oversampling.

Best,
Alex

Last edited by Alexandre; 28th April 2011 at 03:57 PM.
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Old 28th April 2011, 07:16 PM   #43
le´flu is offline le´flu  Germany
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Quote:
Originally Posted by Peter Daniel View Post
I want it to make it look a bit more fancy, so I added those LEDs; they indicate sources and phase.
Hi, so you can indicate wether you´re in- or out-of-phase ? I guess
you´re using the 74atc86 chip for that. With relay?
And what circuit do you use for changing the source? I think the impedance
of the switch is important cause it affects 75ohm imp.

Greetings Ulf
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Old 28th April 2011, 07:33 PM   #44
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I use TOCO toggle switch for source selecting, didn't observe any problems.

As to polarity switch, this is how it's implemented (to match my reversed XLR output wiring, for unbalanced signal, it will be the other way)
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Last edited by Peter Daniel; 28th April 2011 at 07:35 PM.
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Old 3rd May 2011, 03:01 PM   #45
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Quote:
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The DAC has been voiced and finalized in my friend's reference system which is highly optimized vinyl rig with 3 way active speakers. In a recent test, the system owner had hard time distinguishing vinyl from digital; the analog front end consisted of modified Versa Dynamics with double Forsell platter, custom air compressors, ZYX Universe silver cartridge and AR PH7/AS phono stages. The digital sources were either modified TL1 and TL0, plus this NOS DAC. His previous AR CD8 was later replaced by TL1/ NOS DAC combo (there was simply no doubts what sounded better).
Quite by accident I came across pictures of this system today, while browsing local audiophile club meetings: http://stereopal.com/HomeVisit/Marlen.htm
This is the older setup, from last October. You can still see there the TVC line stage I've built for him. The most recent picture in attachment. It's sort of a spy pic, that's why the quality isn't to my usual standards

This is the system when we (me, Marlen and George from Audio Oasis) do all the critical listening comparisons. While all technical aspects of the design come from me, those two other guys always contribute to the final voicing of the device.
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File Type: jpg iphone 075.jpg (537.8 KB, 2207 views)
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Last edited by Peter Daniel; 3rd May 2011 at 03:13 PM.
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Old 3rd May 2011, 10:13 PM   #46
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And what do I use? My main DAC does not feature such fancy enclosure, I actually tried to avoid enclosure completely and ended up with a board mounted to a piece of spruce block with two small panels to secure connectors and another one on top, holding everything together. I quite like it this way. We compared fully enclosed DAC to this one, and didn't observe any major differences.
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File Type: jpg D10.jpg (165.1 KB, 2055 views)
File Type: jpg D20.jpg (158.6 KB, 1911 views)
File Type: jpg D30.jpg (196.4 KB, 1841 views)
File Type: jpg D40.jpg (183.6 KB, 848 views)
File Type: jpg D50.jpg (197.4 KB, 828 views)
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Old 3rd May 2011, 10:33 PM   #47
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My main transport is still TL0. Normally Shigaclone stands right beside (to play discs TL0 can't), but recently I was also using ML31.5 (testing before upcoming sale). The line stage is S&B TX102 (fully balanced), amps are F3 (mids/highs, passive crossover) and A75 (bass, crossed actively). The speakers were built in 1996 and I still find them attractive. The DAC sits in a back. All cables come from: BLUEBERRY HILL AUDIO-Manufacturer of high-end cables
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File Type: jpg sys2.jpg (199.2 KB, 1085 views)
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Old 3rd May 2011, 10:36 PM   #48
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Forgot about the computer (left from a preamp), it's presently used for movies only
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Old 4th May 2011, 02:08 PM   #49
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Hi Peter, thanks for this info. You may find the following useful:
Improving Your diyparadise Products
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Old 4th May 2011, 04:05 PM   #50
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Default Shunt regulator parts

I see that AD811 and LM285Z-2.5 are easily available from Digikey.

BSP129 is "on order" at MOUSER and due in August.

Just thought I would pass this along to any interested.
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