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Red Baron V4.0 free running DEM oscillator modification

Posted 29th March 2013 at 12:02 PM by dvb projekt
Updated 28th July 2014 at 10:07 AM 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 pcbs.

Because i am no developer of electronic circuits but have the knowledge to design pcbs,
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 pcbs and best regards

Oliver
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Old

Tube-I-zator / TDA1541A recommended modification #2

Posted 24th March 2013 at 02:10 PM by dvb projekt
Updated 28th July 2014 at 10:15 AM by dvb projekt

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Tube-I-zator V2.0 / TDA1541A recommended modification

Posted 20th March 2013 at 10:11 PM by dvb projekt
Updated 28th July 2014 at 10:10 AM 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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...
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Old

The Red Baron DAC Module V4.0 - Out of production

Posted 8th February 2013 at 08:34 AM by dvb projekt
Updated 19th June 2013 at 10:26 AM by dvb projekt

The Red Baron
V4.0



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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 ICs
- 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
...
Attached Files
File Type: pdf Red Baron V4.0.pdf (593.7 KB, 395 views)
File Type: zip TDA1541A Project - BOM - for The Red Baron V4.zip (9.3 KB, 157 views)
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Old

Ceasar II 300B SE mono block upgrade Part #2

Posted 24th July 2012 at 06:01 PM by dvb projekt
Updated 21st October 2012 at 01:03 PM by dvb projekt (Review added)

A short quick upgrade for my Ceasar II Monos
to push the sq to the limit...



In the meantime...

As you could see in the Upgrade Part #1, the printing of the Sophia Electric Royal Princess 300B
is 90 degrees different to the Emission Labs 300B-XLS.

Not a big thing, but its not looking good!


Unfortunately i have only two holes for the Tube-Socket. Therefore i made two small adapter to rotate the Tube-Socket.

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Now the printing faces to the front!

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Perfect!



2nd Upgrade


The three grid stopper resistors will be changed from AUDIO NOTE 2 Watt Tantalum to Texas Components TX2575
...
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Old

Ceasar II 300B SE mono block upgrade Part #1

Posted 5th July 2012 at 06:36 PM by dvb projekt
Updated 24th July 2012 at 05:33 PM by dvb projekt (Titel changed)

A short quick upgrade for my Ceasar II Monos
to push the sq to the limit...


The last upgrade i made is to swap from the very good sounding Emission Labs 300B-XLS to

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the Sophia Electric Royal Princess 300B

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For me the best sounding 300B on the market!

The parts for further upgrading are:

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1st - The caps C2 & C3
2nd - The grid stoppers R5, R8 & R10


1st Upgrade




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The Mundorf silver/gold/oil are changed to the new Duelund Cast PIO-Cu.

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...
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Old

Ultra high-end amplifier for Stax Electrostatic Headphones

Posted 9th June 2012 at 09:23 AM by dvb projekt

Because my Stax SR-404 Limited is now one year in his box without using...


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...i start a new project, based on the fabulous circuit from Andreas Rauenbuehler on high-amp.de




The Transistoramp V4.0

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My pcbs are ready and now i am collecting the parts.

A set of wonderful teflon Stax Pro and Normal jacks, ive got from a group buy on Head Case.

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So stay tuned...

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Old

First Watt F5 Amp finished

Posted 19th February 2012 at 11:42 AM by dvb projekt
Updated 11th June 2013 at 05:31 PM by dvb projekt (Hifi-Tuning Supreme 3 fuse photo added)

My F5 is ready to burn in



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The postman delivered today the last small part for perfection...

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The Hifi-Tuning Supreme 3 fuse


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