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NOS TDA1541A double crown

Posted 27th January 2012 at 04:54 PM by dvb projekt

I am a lucky man!

Iīve got two NOS TDA1541A double crown DACīs from a friend



Click the image to open in full size.

He bought the last from Philips a long time ago...


Just now i swapped them on my Red Baron modules...

Click the image to open in full size.

What could i say.... They will never leaving the DAC modules again !!!




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Rating: 2 votes, 4.50 average.

First Watt F5 Amp build

Posted 27th January 2012 at 01:53 PM by dvb projekt
Updated 8th January 2014 at 07:17 PM by dvb projekt (Project finished)

After reading so much over this amp, i will start a new project for my Hornspeaker

Letīs see if the F5 can play in the same league as my 300B monoīs



The parts


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Schaffner FN 2070 - 3A multistage EMI Filter



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Antek AS-4218 - 400VA transformer



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SST03 Softstart module from Sjostrom Audio
Design without extra transformer


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RFB03 rectifier bridge from Sjostrom Audio

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with IXYS DPG 60 C 200 HB HiPerFRED diodes



...
Attached Files
File Type: zip Front- & Backpanel .fpd files.zip (4.2 KB, 46 views)
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Tube Rectifier Comparison with SSHV in between

Posted 16th September 2011 at 12:14 PM by dvb projekt
Updated 16th September 2011 at 04:38 PM by dvb projekt

Click the image to open in full size.
Vin= SSHV input / Vout= SSHV output


Because i am on vacation, i had the time to listen to two other tube rectifier i have.

The question, if there are still differences in sound with different tube rectifiers and the SSHV in between, is

YES !!!

Till now i used the Bendix 6101, a very nice sweet and soft sounding rectifier.

After i roll to the SED Winged "C" 5U3C (5U4-G) Black Plate rectifier,



...someone lift a invisible curtain...



Much more precision in the mids and highs and the soundstage open up in all directions.
Jesus, in comparison the Bendix sounds much to soft!

The Mullard GZ37/CV378 Coke Bottle has also the qualities of the 5UC3 Black Plate,
but is a bit softer sounding.

The only disadvantage
...
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Best source for TX2575 Naked Z-Foil Resistor

Posted 28th August 2011 at 07:52 AM by dvb projekt
Updated 28th July 2014 at 10:12 AM by dvb projekt

All members who want to use the "holy grail" audio resistor,

the TX2575 Naked Z-Foil,

could order it direct at Texas Components.


Thatīs the cheapest way to get it IMO.

They have also great Trimpots with Bulk Metal Foil Technologie.





P.S.: If you send a mail to Arbie, send her regards from me!
Attached Files
File Type: pdf 5 Reasons to Specify Bulk Metal Foil Pots.pdf (800.9 KB, 913 views)
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TDA1541A DAC Module V3.0 - Out of production

Posted 20th August 2011 at 08:32 AM by dvb projekt
Updated 19th June 2013 at 10:27 AM by dvb projekt

The Red Baron

aka TDA1541A DAC V3.0


Click the image to open in full size.


The evolution brings the following changes

- Direct shunt voltage inputs with shortest onboard traces
- I2S In-/Outputs with shortest onboard traces
- Upgrades DEM Synchronizer
- Onboard Grounded-Gate MOSFET Current Buffer I/V Stage
(-ecdesigns- MK7 version)
- Compacter design


Still on the module

- Separate GND-Trace for DEM-Synchroinizer
- Master/Slave connectors for parallel DAC module usage
and external I/V Buffer stages e.g.
Tube-I-zator & DDNF Stage
- Groundplane
- no SMD Design


Click the image to open in full size.


The PCB has the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 125x73 mm
...
Attached Files
File Type: zip TDA1541A Project - BOM - for The Red Baron.zip (9.0 KB, 758 views)
File Type: pdf The Red Baron DAC.pdf (28.9 KB, 1657 views)
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The complete DDNF I/V Output Stage

Posted 19th June 2011 at 02:14 PM by dvb projekt

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Transformer input voltage: 3* 24VAC
Shunt input voltages: 3* 32VDC
Shunt pot value: 3* 5k0
Heatsink Rth: 3,7 K/W or better



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Transformer for Pedja Rogicīs DDNF I/V Stage

Posted 23rd May 2011 at 10:44 AM by dvb projekt
Updated 14th June 2013 at 09:47 AM by dvb projekt

If you would build the DDNF I/V stage with my PSU & Salas Shunt modules,
you could order a custom made transformer at
AE-Europe.

It has the following data:

Primary:

115-0 / 115-0
(for 115V & 230V usage)

Secondary:

24V-0-24V / 2A
24V-0 / 2A
Magnetic Shield

You could order two versions:

- Standard: EI-core € 64,-

- High End: C-core (same size as 30317) € 112,-

Prices are excl. shipping and VAT
Delivery time around 6 weeks after order.


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Pedja Rogicīs Discrete Diamond Non-Feedback I/V Stage - Out of production

Posted 17th May 2011 at 04:15 PM by dvb projekt
Updated 14th June 2013 at 09:46 AM by dvb projekt

For all of you who want an alternative non-tube I/V stage,
Pedja Rogic was so kind and permit me to make a pcb with his circuit.

To get a smaller pcb, i made two connectors for the needed big 10ĩF caps.


Click the image to open in full size.


The PCB will have the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 110x95 mm
Surface finish: Immersion Gold
Copper weight: 70ĩm
Soldermask: Both sides - green
Silkscreen: Legend on top

Out of production

Attached Files
File Type: pdf Pedja Rogic DDNF IV Stage.pdf (71.0 KB, 2768 views)
File Type: zip Pedja Rogicīs DDNF IV Stage BOM.zip (4.9 KB, 465 views)
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Digital Input Modules Power & Signal Schematic

Posted 8th May 2011 at 04:48 PM by dvb projekt

On request the section of my digital input modules


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External PSU finished

Posted 2nd May 2011 at 07:02 PM by dvb projekt

After a long weekend , i have finished the external PSU!

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Here are some internal view pictures.

On the upper side the two +/- Power Supply Modules,
in the lower left corner the 10H choke on amorphous cores from AE-Europe,
in the middle the 1st cap (3,9ĩF Mundorf supreme silver in oil) of the HV-PSU line,
in the lower right corner the Power Switch Module with onboard solid state relays.

Click the image to open in full size.

And some close-up pictures

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...
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