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Old 25th March 2013, 08:28 AM   #781
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Quote:
Originally Posted by neda View Post
Hi Oliver,

When using 2 Red Baron's in parallel, are 8.2nf caps used for this mod, and
does the 28r I/V resistors (Tube-i-zator) need to be changed?

Best regards,
Ned
Hi Ned,


for the corner frequency between 300-400 kHz you have to calculate the capacitor value for one chip (56R, 8,2pF). Then place this value on each chip for each channel.

Same for the I/V resistor, simply calculate I/V resistor value for one DAC chip (=56R) and place two of these resistors in parallel (=28R).

In short, total capacitance is doubled, total I/V resistor value is halved, turnover frequency remains unchanged.

When using two Red Baron parallel, you need 4x 8,2nF caps and a R I/V of 28R.

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Old 26th March 2013, 05:22 PM   #782
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Exclamation Personal announcement

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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Last edited by dvb projekt; 26th March 2013 at 05:27 PM.
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Old 1st April 2013, 12:46 PM   #783
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Exclamation Bargain Sale

Bargain Sale


Here you could order my ready build Tube-I-zator test module
(excl. Tubes, Rk & R I/V)

Main Parts

- Nichicon KX Series caps (HV-PSU)
- Panasonic FM Series caps (Heater PSU)
- Mundorf MCap EVO aluminium/oil 2.2F output caps
- Fairchild ISL9R460PF2 Stealth rectifier diodes

for the special price of


$99

including
Worldwide shipping and paypal fee


Click the image to open in full size.




If you are interested, please send me a PM.



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Last edited by dvb projekt; 1st April 2013 at 12:57 PM.
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Old 5th April 2013, 03:29 PM   #784
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Exclamation The new Tube-I-zator V3.0

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
Surface finish: Immersion Gold
Copper weight: 70m
Soldermask: Both sides - green
Silkscreen: Legend on top


In Stock

The price will be as followed:

Professional 2-Layer PCB: $30
Worldwide shipping: $ 9
Europe shipping: $ 5
paypal fee: 3,9%

Shipping insurance on buyers request!

A donation of $3 USD to diyAudio will be done for every pcb sold.



Click the image to open in full size.

A 2nd small failure in my design program needs to expand one of every heatsink mounting holes a bit (1mm).



These two small design failures will be corrected in one of the next batches.
Thanks in advance for your understanding!



You will find the BOM and Schematic in my blog.


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Old 5th April 2013, 03:38 PM   #785
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Attached two quick pictures of the populated Tube-I-zator V3.0

Attached Images
File Type: jpg SAM_1626.jpg (685.5 KB, 265 views)
File Type: jpg SAM_1627.jpg (636.7 KB, 259 views)
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Old 5th April 2013, 04:01 PM   #786
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Nice work Oliver!
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Old 5th April 2013, 08:23 PM   #787
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Hi.
Can i use Tube-I-zator PCB with PCM1794A? (DDAC 1797 NOS -Doede)
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Old 5th April 2013, 08:36 PM   #788
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neat.
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Old 6th April 2013, 09:47 AM   #789
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Quote:
Originally Posted by crobbins5421 View Post
Nice work Oliver!
Quote:
Originally Posted by merlin2069er View Post
neat.
Thanks

Quote:
Originally Posted by jeremysk View Post
Hi.
Can i use Tube-I-zator PCB with PCM1794A? (DDAC 1797 NOS -Doede)
Sure. Please ask Doede witch I/V resistor value , Tubes and Rk value he recommend.

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Old 8th April 2013, 12:26 PM   #790
acccruz is offline acccruz  Portugal
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Nice work Dear Oliver!

CONGRATULATIONS!

Soon I will buy one or may be two boards.

Cheers,
Antonio
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