Pedja Rogic´s Discrete Diamond Non-Feedback I/V Stage for TDA1541A

[dvb-projekt]

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 10µF caps.




The PCB will have the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 110x95 mm
Surface finish: Immersion Gold
Copper weight: 70µm
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 pcb´s.

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The 1st test sample arrived.



Testing begins when i´ve got all parts.

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Also the DDNF I/V Stage PSU Module is in production.



Further informations in my Blog.

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The testing is finished and the GB could start.

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




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

[dvb-projekt]

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 it´s extreme 3D stage.

All this with a PRP9372 R I/V and with Mundorf Supreme 10µF 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...

It´s up to your taste!

[studiostevus]

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.

[Malka07]

Originally Posted by dvb-projekt

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 it´s extreme 3D stage.

All this with a PRP9372 R I/V and with Mundorf Supreme 10µF 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...

It´s up to your taste!

Hmmm interesting..very interesting...Oliver have you tried the EcDesigns Mk7 output yet?

[dvb-projekt]

Originally Posted by Malka07

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.

[dvb-projekt]

[dvb-projekt]

The new batch of the DDNF I/V Stage module arrived.

It has an updated silkscreen, where the build-in direction failure
of the BC557C´s is corrected.

I will dispatch all payed pre orders tomorrow.


Best regards,
Oliver