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The final parts for the Reference DAC Case

Posted 25th April 2011 at 10:26 AM by dvb projekt

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On the left side

USB-Isolator from Circuits@Home

Teralink X2 USB to I2S converter (with my modification)

TDA1541A Salas shunt reg. module

+5V Salas shunt reg. module
(downlink side of USB isolator incl. +5V line of Teralink X2/ Twisted Pear WM8804 / Ultra highspeed buffer module / I2S switch)

+3,3V Salas shunt reg. module (+3,3V line of Terlink X2)



In the middle

Twisted Pear WM8804 SPDIF to I2S converter

On top the Ultra High Speed Buffer module

I2S switch

2* TDA1541A DAC module with direct input shunt mod.



On the right side

2* SSHV-Shunt module (one for each channel)

Tube-I-zator V2.0
(the remaining parts of the onboard HV-PSU are not necessary,
because of the Tube-Rectifier
...
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Old

High Voltage schematic for the Reference DAC PSU

Posted 20th April 2011 at 08:21 AM by dvb projekt

Here you could see the final schematic for the HV lines.

The two 40mA current taps are the SSHV-Shunts,
one for each channel on the Tube-I-zator.



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Old

The PSU case

Posted 17th April 2011 at 11:45 AM by dvb projekt
Updated 4th May 2011 at 01:01 PM by dvb projekt

Finally the engraved top-, front- & backplate arrived.

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Surely you are asking yourself, why i made a 1mm deep square around the place for the transformer...

...now here is the answer

Click the image to open in full size.

Ive got a perfect aluminum transformer housing and now it sits perfect without an air gap.


Now its time to assemble the parts.


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Old

Salas Shunt Module direct input modification

Posted 7th April 2011 at 02:50 PM by dvb projekt

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What can i say...

STRONGLY RECOMMENDED


Quote:
Originally Posted by Malka07

Soooooo enough of how i did it, how does it sound?
is it better then with the tl431 shunts on board?
well the answer is a
BIG YESSSSSSSSSSSSSSS

From the first 3 notes coming out of the speakers i knew it was much much better sounding then with the tl431's
(this also confirmed by people i played music to, saying 'WOW' out loud within the first 3 notes being played!!!)
the soundstage is deeper, wider higher, very 3d sounding, lots of air inbetween instruments, there location is now easily identifiable,
detail amazingly has also improved (i thought it was already very detailed) now i hear things i never did before.
Even the bass
...
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Old

SSHV-Shunt Module

Posted 7th April 2011 at 01:19 PM by dvb projekt
Updated 28th July 2014 at 09:02 AM by dvb projekt (Stock status updated)

My last thoughts to optimize the Tube-I-zator goes to the B+ High Voltage lines.
To get the maximum flexibility, i have made splitting points in the lines.
The splitting of the anode psu lines brings upgrades possibilities.

You could use e.g. a tube rectifier with C-R-C filter instead of the onboard andoe psu or
switch to a regulated shunt psu, witch in my mind brings the greater sound quality upgrade.

With the experiences from Salas low voltage shunt on my DAC project in mind,
i have made an upgrade module for the Tube-I-zator based on his HV shunt circuit design.

Here it is


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


The specifications are:

-
...
Attached Files
File Type: zip Tube-I-zator SSHV-Shunt BOM Final.zip (6.8 KB, 417 views)
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Old

Tube-I-zator V2.0 Output Stage - Out of production

Posted 7th April 2011 at 01:14 PM by dvb projekt
Updated 14th June 2013 at 09:47 AM by dvb projekt

The Tube-I-zator V2.0

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The evolution brings the following changes:

- Heater Switch without any relays
- Low ESR Heater PSU (e.g. Panasonic FM)
- Star Grounding
- Mounting holes for the HV-Salas Shunt Module
- Compacter design





The PCB has the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 193x157 mm
Surface finish: Immersion Gold
Copper weight: 70m
Soldermask: Both sides - green
Silkscreen: Legend on top

Out of production
Attached Files
File Type: pdf Tube-I-zator V2.0.pdf (19.4 KB, 1116 views)
File Type: zip Tube-I-zator SSHV-Shunt BOM Final.zip (6.8 KB, 512 views)
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Old

Reference TDA1541A DAC Power Modules

Posted 7th April 2011 at 01:01 PM by dvb projekt
Updated 28th July 2014 at 09:07 AM by dvb projekt (Stock status updated)

+/- Power Supply Module

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- up to 15 caps per rail (16mm to 18mm diameter)
- place for decoupling foil cap in each rail
- place for bleeder resistor
- 105m copper weight
- 2mm pcb
- Immersion Gold
- green soldermask on both side
- Board size 195mm x 120mm

In stock


Reference TDA1541A DAC PS Module

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All lines are designed for the Mundorf M-LYTIC AG+ 4-Pole caps.
If you want to use normal 2-Pole Snap-In caps, just short the pads.

Diode snubber caps could be integrated.

This module is an alternative to the +/- PS module for those,
who dont want to use many small caps.



The PCB will have the following data:

Material: FR4 - 2mm
...
Attached Files
File Type: pdf MLytic 4pin.pdf (13.4 KB, 205 views)
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