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.

An externally hosted image should be here but it was not working when we last tested it.

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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[dvb projekt]

The 1st test sample arrived.

An externally hosted image should be here but it was not working when we last tested it.

Testing begins when i´ve got all parts.


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[dvb projekt]

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

An externally hosted image should be here but it was not working when we last tested it.

Further informations in my Blog.



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[dvb projekt]

Testing finished

The testing is finished and the GB could start.

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

An externally hosted image should be here but it was not working when we last tested it.

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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[dvb projekt]

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 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!

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[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]

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]

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]

An externally hosted image should be here but it was not working when we last tested it.

 

[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​

 

[mr-mouse]

any more?

Is there a chance of another production run?

I would like to get a board.. i've got all the parts.

thanks, mr-mouse

 

[dvb projekt]

Is there a chance of another production run?

I would like to get a board.. i've got all the parts.

thanks, mr-mouse

Hi mr-mouse,

because of a low interest in the past, i will not start a new batch.

For all who want to produce this pcb, i have attached the Gerber files.

If you want to have my populated pcb, please send me a PM.

Best regards,
Oliver

 

[dvb projekt]

Updated Gerber Files

For all who want to use the Gerber files, please use the attached version with the updated silkscreen!

Accidentally i uploaded the old files with the silkscreen failure.

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[dvb projekt]

Bargain Sale

Bargain Sale​

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Here you could order my ready build DDNF test module


Main Parts

- PRP Resistors
- Elna RFS Silmic II caps
- Mundorf MCap supreme 10µF output caps

for the special price of

$99

including
Worldwide shipping and paypal fee

An externally hosted image should be here but it was not working when we last tested it.

If you are interested, please send me a PM.



​

 

[dvb projekt]

Bargain Sale​

​

​

Here you could order my ready build DDNF test module


Main Parts

- PRP Resistors
- Elna RFS Silmic II caps
- Mundorf MCap supreme 10µF output caps

for the special price of

$99

including
Worldwide shipping and paypal fee

An externally hosted image should be here but it was not working when we last tested it.

If you are interested, please send me a PM.



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Sold!
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[wengtech]

hi oliver,
i'm just curious with this DDNF IV
will it be better if using C2240 A970 instead of BC557 BC547 ??
any mod needed for C2240 A970?

thanks.

 

[dvb projekt]

hi oliver,
i'm just curious with this DDNF IV
will it be better if using C2240 A970 instead of BC557 BC547 ??
any mod needed for C2240 A970?

thanks.

Hi,

unfortunately i can´t answer this question. Please ask Pedja, because it is his circuit. 😉

Best
Oliver

 

[wengtech]

bc557 bc547 are they have to be matched N to P?
the hFE maybe...?

 

[dvb projekt]

bc557 bc547 are they have to be matched N to P?
the hFE maybe...?

I can´t remember that Pedija recommended this in any case.