IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...

[wlowes]

Thanks for Jack detail information, I eventually install NS2 clock

Nice looking build casshan.
What did you use before NS2? Did sound change with the NS2?

 

[Deleted member 537459]

Before NS, i use crystek, is a big difference price but is a very big improve! More bass more control more silence.

 

[diyiggy]

Does anybody watch at the ocxo line from NDK ? Its my understanding the pins case packages maybe have embeded oven in the package?!

 

[casshan]

Nice looking build casshan.
What did you use before NS2? Did sound change with the NS2?

I used NDK before. NS2 sounds very different from NDK, it is more smooth and analogue. However, Fifopi cannot accept 2 NS2 simultaneously because of technical problem.

 

[jimk04]

Are there any photos of a completed lt3042 reg that Ian supplied bare?

I have some confusion with the schematic versus the silk screen printing.

 

[simon dart]

Does anybody watch at the ocxo line from NDK ? Its my understanding the pins case packages maybe have embeded oven in the package?!

From what I've seen a lot of OXCO's and TCOXO's aim at low wander rather than low jitter. Wander is longer term frequency stability which has little relevance to audio. The devil is always in the small print!

 

[sq225917]

Added another teg, for VCCA, didnt sound worse from the off this time. Letting it run in for a bit before a listen.

 

[TioFrancotirador]

Hi guys,
Here are the result of my test on output stages for dual es9038q2m:
The gear: Rpi was powered by low noise 5V LDO, FifoPi powered by Ultracaps @ 3.3V and Dac board powered by another Ultracap @3.3V.
I tested following output stages:
- Ian opamp board with Sparkos Labs Class A power by Salas Bib 1.3
- Ian LL1544A board
- Super V/I LL1684 converter (voltage out mode)
- Ivans trafos sepcially made for dual es9038q2m from this thread:
Output transformers for DACs
The amp was Modulus-686 from neurochrome from this thread:
Modulus-686: 380W (4Ω); 220W (8Ω) Balanced Composite Power Amp with extremely low THD

Out of those three stages I tested Ivans trafos was absolutelly the best! I would say the most musical and natural sound. I really recommned you try them. Now I am waiting for Ivan to make me voltage out trafo for ak4497 so that I can compare them to Teramoto Finemet
So now I got 2xLL1684 and 2xLL1544A to sell. Anyone? ...

Thanks Ian, Thanks Ivan for your great work guys!

 

[casshan]

Hi guys,
Here are the result of my test on output stages for dual es9038q2m:
The gear: Rpi was powered by low noise 5V LDO, FifoPi powered by Ultracaps @ 3.3V and Dac board powered by another Ultracap @3.3V.
I tested following output stages:
- Ian opamp board with Sparkos Labs Class A power by Salas Bib 1.3
- Ian LL1544A board
- Super V/I LL1684 converter (voltage out mode)
- Ivans trafos sepcially made for dual es9038q2m from this thread:
Output transformers for DACs
The amp was Modulus-686 from neurochrome from this thread:
Modulus-686: 380W (4Ω); 220W (8Ω) Balanced Composite Power Amp with extremely low THD

Out of those three stages I tested Ivans trafos was absolutelly the best! I would say the most musical and natural sound. I really recommned you try them. Now I am waiting for Ivan to make me voltage out trafo for ak4497 so that I can compare them to Teramoto Finemet
So now I got 2xLL1684 and 2xLL1544A to sell. Anyone? ...

Thanks Ian, Thanks Ivan for your great work guys!

Do you have photo for your Ian 9038 DAC with Ivan transfos?

 

[TioFrancotirador]

Do you have photo for your Ian 9038 DAC with Ivan transfos?

Here you go. All the goodies in one place.

 

[jacklee]

Here you go. All the goodies in one place.
View attachment 766382

I also got Ivan's transformers but haven't got around to install them. With your positive feedback I better do it soon. Btw, how do you load the transformers? I see that there are resistors at the output. What values do you prefer? Thanks.

 

[TioFrancotirador]

I also got Ivan's transformers but haven't got around to install them. With your positive feedback I better do it soon. Btw, how do you load the transformers? I see that there are resistors at the output. What values do you prefer? Thanks.

In my case: XLR out. Ivan suggested to use 3K3 on each phase to get 2Vrms on the output.

 

[jacklee]

In my case: XLR out. Ivan suggested to use 3K3 on each phase to get 2Vrms on the output.

Thanks! Will try that soon.

 

[sq225917]

Still very happy with the 1674s in the iv. Ill swap back to the opamp board tomorrow and see how it compares since I added regs for avcc and vcca.

 

[iancanada]

ShieldPi

I designed a ShieldPi to add an additional shield layer between DAC and FifoPi or RPi.

Theoretically it can help to eliminate cross talk and to suppress possible RF noise from boards underneath the DAC. But I'm not sure by how much.

Please let me know if anybody is interested in trying it.


ShiledPi1 by Ian, on Flickr

Regards,
Ian

 

[Morde]

I would like to try this.

 

[Deleted member 537459]

If is possible i want try. Thanks Ian

 

[misterdog]

Hi Ian, would you have 3 available, for myself, Simon and Ian.

I'll send you a PM.

Cheers Paul.

 

[ed linssen]

"Shield Pi"

I would like to try one too, if possible.
Thanks,
Ed

 

[big bird]

I also would like to try the shield pi.

Bert.