Pedja Rogics Discrete Diamond Non-Feedback I/V Stage for TDA1541A - diyAudio
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Old 20th May 2011, 10:09 AM   #1
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Exclamation Pedja Rogics Discrete Diamond Non-Feedback I/V Stage for TDA1541A

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 10F 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: 70m
Soldermask: Both sides - green
Silkscreen: Legend on top

The price will be:

Pedja Rogic DDNF I/V Stage Module: $ 16

Worldwide shipping: $ 9
Europe shipping: $ 5
paypal fee: 3,9%


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

After testing the GB will start shortly.

Please post your pre-order wishes to my Blog.

I will delete the comments after dispatching the pcbs.



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Old 2nd June 2011, 06:32 PM   #2
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The 1st test sample arrived.

Click the image to open in full size.

Testing begins when ive got all parts.


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Old 3rd June 2011, 12:16 PM   #3
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Also the DDNF I/V Stage PSU Module is in production.

Click the image to open in full size.

Further informations in my Blog.



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Old 20th June 2011, 05:15 AM   #4
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Exclamation Testing finished

The testing is finished and the GB could start.

Here you could see the complete DDNF I/V Output Stage.

Click the image to open in full size.


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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Old 25th June 2011, 02:35 PM   #5
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Exclamation 1st listening impressions

The whole DDNF I/V stage runs now around 40 hrs.
Time to make a listening session.

1st i am very impressed.
In comparison with my Tube-I-zator it has a bit wider soundstage and a more forward presentation.
The smoothness of the tube is gone. It is extreme fast and punchy.
As the Tube-I-zator with a beautiful natural sound, but not with its extreme 3D stage.

All this with a PRP9372 R I/V and with Mundorf Supreme 10F caps.
What would happened when a Texas Component TX2575 goes in the I/V position
and the caps would be changed to Mundorf Supreme silver/oil or silver/gold/oil...

Its up to your taste!

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Old 25th June 2011, 04:36 PM   #6
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I havent built the tube output stage, only this discrete stage, and i agree with your impressions. It's very fast and direct. I still feel it is very transparent and very detailed.

I think indeed that the choice of caps can help to "tune" the stage to your taste a bit.
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Old 26th June 2011, 12:04 PM   #7
Malka07 is offline Malka07  England
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Quote:
Originally Posted by dvb-projekt View Post
The whole DDNF I/V stage runs now around 40 hrs.
Time to make a listening session.

1st i am very impressed.
In comparison with my Tube-I-zator it has a bit wider soundstage and a more forward presentation.
The smoothness of the tube is gone. It is extreme fast and punchy.
As the Tube-I-zator with a beautiful natural sound, but not with its extreme 3D stage.

All this with a PRP9372 R I/V and with Mundorf Supreme 10F caps.
What would happened when a Texas Component TX2575 goes in the I/V position
and the caps would be changed to Mundorf Supreme silver/oil or silver/gold/oil...

Its up to your taste!

Hmmm interesting..very interesting...Oliver have you tried the EcDesigns Mk7 output yet?
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Old 26th June 2011, 02:47 PM   #8
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Quote:
Originally Posted by Malka07 View Post
Hmmm interesting..very interesting...Oliver have you tried the EcDesigns Mk7 output yet?
No. This will be on the DAC V3.0 module witch is scheduled to August/September.
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Old 2nd July 2011, 06:43 AM   #9
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Click the image to open in full size.
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Old 11th July 2011, 12:56 PM   #10
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The new batch of the DDNF I/V Stage module arrived.

It has an updated silkscreen, where the build-in direction failure
of the BC557Cs is corrected.

I will dispatch all payed pre orders tomorrow.


Best regards,
Oliver
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