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Old 17th July 2006, 08:50 PM   #601
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Default 8 X TDA1541 or 16...64 X TDA1543?

Hi tubee,

Thanks for your reply [post#594]

I got the TDA1543's from NEDIS, they will receive new ones soon. Yes I already start worrying, with the AD823 I/V stage and the OPA627 diff amp, the 16 X TDA1543 DAC is catching up fast with the octal D-I DAC. It already has that smooth crystal clear open sound that even seems to improve the longer the DAC is switched on. I was worried that the linear interpolation with 16 DAC's would cause a disturbing high frequency rolloff, but it seems to work beyond expectation. The added even harmonic distortion produced with this setup (linear interpolation), starts to resemble the mixed mode on the octal D-I DAC, and brings a beautiful balance to sound quality.
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Old 17th July 2006, 08:57 PM   #602
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Default TDA1543 setup

Hi maxlorenz,

Thanks for your reply [post#595]

Yes, Dutchman also listened to the octal TDA1543 D-I DAC setup and the smaller semi-3 way sonic resonators in the cellar. (my cellar hasn't got the best acoustics). But that was Saturday, Sunday the setup already evolved to a 16 DAC version as can be seen on the photograph [post#589]. Today the OPA2132 (I/V stage) was replaced by a AD823. And I wouldn't be John if I didn't try both the 32 and 64 DAC D-I setup as soon as I got time. I am also working on the octal D-I DAC housing. Sidepanels, bottom plate and top cover are already machined. Now I can start to figure out where to place the power supplies, system controller, I2S input selector and the analog switching module.
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Old 17th July 2006, 09:02 PM   #603
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Default TDA154?

Hi MGH,

Thanks for your reply [post#596]

Yes, good question. At the moment the TDA1541A octal D-I DAC sounds better, but as I already noted, the 16 X TDA1543 D-I version is catching up fast. I am already very curious how a 32 or 64 TDA1543 D-I version would compare to it.
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Old 17th July 2006, 11:31 PM   #604
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Hi ecdesigns,

Quote:
Today the OPA2132 (I/V stage) was replaced by a AD823. And I wouldn't be John if I didn't try both the 32 and 64 DAC D-I setup as soon as I got time.
Man, I wish you lived next door!

(and we could compare your sonic resonators to my DIY Tannoy Autograph's enclosures )

Keep the good work.
M
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Old 17th July 2006, 11:42 PM   #605
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Hi ErikdeBest,

Quote:
Last Friday I visited ec-designs, curious about his system. I liked it a lot. I also heard the 8x TDA1543 version, but this was on another system, another room. But sure, not bad either!
Dutchmen are so laconic!

I know how multi 1543 can sound. Please comment about high frequency's performance of this DAC

Gratefully yours,
M
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Old 18th July 2006, 04:00 PM   #606
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Default Octal D-I DAC housing

Hi all,

After all the electronics, something completely different, the octal D-I DAC housing.

I will post some more pictures of the octal D-I DAC housing later. This is the first one, it shows the massive 8mm thick aluminum sidepanels, the bottom plate and the keyboard / indicator frame. At the center, the analog mainboard with a thin aluminum screen plate already fitted. It is placed between both the analog mainboard and the modules. On top of the screen plate is a thin polyester foil for insulation. The 4 round feet are made of acetal copolymer, with a embedded 3mm thick neoprene rubber disc to avoid scrathes.

All parts, polyester foil included were manufactured using a CNC milling machine.
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Old 18th July 2006, 04:10 PM   #607
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Hi all,

Picture 2 of the octal D-I DAC housing.

Here the modules have been placed, as indicated, a thin polyester foil will prevent possible short circuits. The screen plate is used for addittional interference reduction. The massive aluminum side pannels are the base of the entire housing, all plates are attached to them using M3 screws. The M3 thread is tapped into the aluminum sidepanels. The aluminum parts are annodized later for a professional finish.
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Old 18th July 2006, 04:24 PM   #608
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Default Nice work !!

Hi ecdesigns !

Nice Work !


Are those three Voltage regs dedicated to each IC ??

-Andy-
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Old 18th July 2006, 04:25 PM   #609
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Hi all,

Picture 3 of the octal D-I DAC housing.

The tube output frame is put into position, special care had to be taken to ensure there was enough clearance between both the analog mainboard and the tube output stage circuit boards. Also the I/V stage outputs had to be located close to the tube output stage, to avoid hum. The entire tube output module can be taken out, by just removing 4 M3 screws, and pulling some connectors. The grid plates are mounted using 5mm spacers. The entire grid can be taken off by removing 3 screws. The tubes can be changed either with a special tube pulling tool (similar to the tools used to remove pilot lamps from switches), or by removing the protective grid first. Power supplies will be placed on two sub-chassis, both left and right from the analog mainboard.
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Old 18th July 2006, 04:34 PM   #610
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Hi all,

Picture 4 of the octal D-I DAC housing.

A front view, notice the sloped cover, I had to bend it myself. All screws will be hexagonal countersunk types. I am planning to annodize the entire housing black, exept for the protective grid. The grid will be annodized natural (aluminum color), so it stand's out. Other colour combinations are possible though, perhaps annodized gold colour for the protective grid would look nice too. The shiny bar on the front panel is 5mm thick massive stainless steel, polished to high gloss.
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