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Tube-I-zator Output Cap Upgrade

Posted 3rd May 2013 at 03:23 PM by dvb-projekt
Updated 15th May 2013 at 07:56 AM by dvb-projekt (Sound review added)
My last dream come true!

The output cap upgrade to the holy grail...

Click the image to open in full size.

DUELUND´s CAST PIO Copper Cap!






Therefore the Tube-I-zator must go to the 2nd floor

Click the image to open in full size.

Click the image to open in full size.


Sound review

Now after ~150 hrs. burn in time, i will share my impressions with these outstanding caps.

I had a déjà vu after changing from my previous Mundorf Suprem silver/gold/oil caps to the Duelund CAST PIO Copper.
The same difference as in my 300B mono block´s.

This openness, clarity, three-dimensionality with so many more subtleties and micro informations, absolute breathtaking.
Only the Duelund CAST has the possibility to reproduce this 3D soundstage
...
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Secure source for A123 Systems LiFePo4 cells

Posted 16th April 2013 at 04:53 PM by dvb-projekt
All members who want to use LiFePo4 cells from the leading company A123 Systems
and want a secure source to get no fakes,
could order them at Lipopower Ltd. in Germany.

The original cells are from the German A123 Systems distributors Reva or BMZ.

You could order them with or without solder taps.

Click the image to open in full size. Click the image to open in full size.


Also a Ri selection is possible.

International shipping and paypal payment is no problem!





P.S.: If you have any questions, send an e-mail to Mr. Karl-Heinz Hofmann with regards from me!


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Old

The new Tube-I-zator V3.0

Posted 5th April 2013 at 03:28 PM by dvb-projekt
Updated 31st March 2013 at 09:04 AM by dvb-projekt
The new Tube-I-zator V3.0

Click the image to open in full size.

The evolution brings the following changes:

- Anode PSU with Salas SSHV Shunt Reg. onboard
- External B+ Input for usage with other Anode PSU
- Heater PSU with C-R-C filtering
- Heater PSU with Softstart circuit
- Heater PSU Power LED

Thanks to John (-ecdesigns-) for the following suggestions!

- Grid stoppers to prevent unwanted oscillations
- Bias current injection for TDA1541A usage
- Pull-down resistors to keep the coupling cap output at GND-potential

Still on the Module:

- Heater switch for 6N2P or 12AX7 usage


An example for a balanced use (e.g. Bufalo II), you could see HERE.



The PCB has the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 193x157 mm
...
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Attached Files
File Type: pdf Tube-I-zator V3.0.pdf (30.2 KB, 141 views)
File Type: zip Tube-I-zator V3.0 - BOM.xls.zip (7.6 KB, 56 views)
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Red Baron 3.3V I2S attenuator modification

Posted 29th March 2013 at 01:15 PM by dvb-projekt
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Red Baron free running DEM oscillator modification

Posted 29th March 2013 at 12:02 PM by dvb-projekt
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Personal announcement

Posted 26th March 2013 at 05:24 PM by dvb-projekt
Updated 26th March 2013 at 05:27 PM by dvb-projekt
Well my friends it is time again to say thanks to all of you, who like and ordered my pcb´s.

Because i am no developer of electronic circuits but have the knowledge to design pcb´s,
i wanted to give something back to the community.

Since i started with my 1st pcb, the Optical-Volume-Control on 15th October 2009,
a small donation from every sold pcb goes to diyaudio.com

Today i am proud to say that your cumulated donation achieve

$ 3104

Keep on having fun with my pcb´s and best regards

Oliver
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Tube-I-zator / TDA1541A recommended modification #2

Posted 24th March 2013 at 02:10 PM by dvb-projekt
Updated 24th March 2013 at 02:19 PM by dvb-projekt
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Tube-I-zator / TDA1541A recommended modification

Posted 20th March 2013 at 10:11 PM by dvb-projekt
Updated 24th March 2013 at 02:18 PM by dvb-projekt (Resistor type added)
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Old

The best sounding I/V resistor

Posted 3rd March 2013 at 09:22 AM by dvb-projekt
Updated 3rd March 2013 at 03:17 PM by dvb-projekt
As many of you know, i am using the Texas Components TX2575 Bulk Z-Foil resistor for a long time
in important circuit positions, especially as I/V resistor.

Recently i stumbled over a short recommendation from Thorsten Loesch.


Quote:
Originally Posted by ThorstenL View Post
Hi,
I would second Rohpoint, Neohm less. Rohpoint are truely excellent. For my first TDA1541 Non-OS DAC (in 98) I handmade bifilar wound Non-inductive 25 Ohm resistors.
In susequent builds I compared to Rohpoint (which I have used extensively and found no reason to handwind resistors.

In my commercial designs we use a specfic type of SMD resistors after auditioning tons.
Some SMD resistors are really bad, some are so-so and some are most excellent, though no patch for a Rohpoint Squaristor GR102.

Ciao T

Because i know Thorsten as a man who had the perfect sound in mind,
i ordered one pair 30R to try them in my Tube-I-zator.

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Old

The Red Baron DAC Module V4.0

Posted 8th February 2013 at 08:34 AM by dvb-projekt
Updated 15th May 2013 at 07:19 AM by dvb-projekt (BOM file updated)
The Red Baron
V4.0



Click the image to open in full size.


The evolution brings the following changes

- Separate I2S-GND route to Digital-GND
- Separate Analog Output GND route
- Separate GND route for active divider decoupling caps to Analog-GND
- Modified active divider decoupling pads for better SMD 1210 caps soldering
- Onboard SOT353 footprint for fastest DEM-Synchronizer IC´s
- Un-interrupted ground plane
- MOSFET Source/Drain failure corrected


Still on the module

- Direct shunt voltage inputs with shortest onboard traces
- I2S In-/Outputs with shortest onboard traces
- I2S Attenuator and DEM Synchronizer
(by -ecdesigns-)
- Onboard Grounded-Gate MOSFET Current Buffer I/V Stage
(-ecdesigns- MK7 version)
- Separate GND-Trace for DEM-Synchroinizer
- Master/Slave
...
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Attached Files
File Type: pdf Red Baron V4.0.pdf (593.7 KB, 218 views)
File Type: zip TDA1541A Project - BOM - for The Red Baron V4.zip (9.3 KB, 80 views)
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