"Reference" TDA1541A DAC with I2S-BUS architecture - Page 103 - diyAudio
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Old 2nd July 2013, 04:41 PM   #1021
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Hey, just got my matched jfets and my tda1541a chips.

Hmm, the shunt regulators have 3x spots for the 170's. Where would I use my matched pairs, or does it matter?
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Old 2nd July 2013, 06:19 PM   #1022
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Originally Posted by dvb projekt View Post
Hi regal,



Keep in mind that my design is primarily a non SMD design!
The the decoupling caps trace length is 6.4mm max. with a resistance of 4mOhm. However, with a pure SMD design you could save the 4mOhm, but is this still audible...
With this real short trace length it sounds fantastic, especially with Johns recommended SMD caps.

Click the image to open in full size.



As you could see on the photo, the ground plane is complete uninterrupted on the top layer. Compare the differences between V3.0 and V4.0 in my blog.

Hello Oliver, I see you are still using 2xTDA1541A in parallel, Do you notice positive results from paralleling? I ask you this because I have also been using 2xTDA1541A until now but from the latest changes John suggested (Free running DEM oscillator, changes on the attenuators...) I decided to use only one and the improvement is big in comparison with The Red Baron V3.0 circuitery, I suppose those big improvements come from the changes in the circuit, but I am starting to think there is really no benefit on sound quality when paralleling. I think ThorstenL and John also think this way , no long ago John said that when paralleling chips Jitter goes up: Building the ultimate NOS DAC using TDA1541A

By the way, the latest changes are highly recommended, it sounds incredible .

Greetings ,
Oier.
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Old 3rd July 2013, 12:02 AM   #1023
wlowes is offline wlowes  Canada
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Hey, I picked up a couple of tda1541 chips too.
Which tubes are in your lampizator output stage?
Excellent,

I use 6np2. Tried 6np1 but for my taste no comparison to 6np2.
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Old 3rd July 2013, 12:07 AM   #1024
wlowes is offline wlowes  Canada
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Originally Posted by Ryelands View Post
The WaveIO works superbly with the TDA1541A, esp with a good PSU. Highly recommended.
I second that. I used a lesser converter. WaveIO kicks it up and shows what tda1541a is capable of. Then you build a dedicated power supply for WaveIO and you'll never go back. So even in its basic form, WaveIO is still not bringing enough. No end of tweaks to make to the PC/OS and still the TDA1541a just breaths new life into the music. Even the USB cable has a significant effect. (short as possible and solid core wire).

In my target layout, the PC processor, WaveIO and Red Baron will be arranged in 3d to allow shortest possible USB and I2S connections.

Last edited by wlowes; 3rd July 2013 at 12:10 AM.
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Old 3rd July 2013, 12:33 PM   #1025
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Even the USB cable has a significant effect.
Best DIY USB cable I've come across so far uses 30AWG Kynar wire-wrap wire - sonically as good IMHO as Cat5 solid core but, being flexible, less likely to damage connectors.

Click the image to open in full size.

See pic - note that one of the pairs is D+/D-, the other is a doubled-up Gnd lead; there's no need for V+ with the WaveIO. (I didn't bother with a screen as the lead is so short. That, of course, minimises capacitance but I did it that way because, essentially, I'm lazy.)
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Old 3rd July 2013, 01:40 PM   #1026
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Did you hack a usb cable or where can you get those usb ends?
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Old 3rd July 2013, 01:42 PM   #1027
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ok, nm. Found them on ebay.
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Old 8th July 2013, 11:15 AM   #1028
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I've got the following transistors;

bc550cbu x2
bc560cta x2

I know they're pretty close to what's on the bom. Are these good for the shunts?

Ok, looks like the other's are obsolete.

Last edited by merlin2069er; 8th July 2013 at 11:19 AM.
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Old 8th July 2013, 11:51 AM   #1029
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There are 2x .1uf left off the BOM for each shunt.

I think I have spares. Still require these in the shunts right?
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Old 8th July 2013, 12:20 PM   #1030
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Quote:
Originally Posted by merlin2069er View Post
I've got the following transistors;

bc550cbu x2
bc560cta x2

I know they're pretty close to what's on the bom. Are these good for the shunts?

Ok, looks like the other's are obsolete.
You could use them for sure!

Quote:
Originally Posted by merlin2069er View Post
There are 2x .1uf left off the BOM for each shunt.

I think I have spares. Still require these in the shunts right?
Salas recommend to skip these two 0.1F. Thats the reason why they arent in the BOM.
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