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Old 18th December 2010, 12:41 PM   #411
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Quote:
Originally Posted by dvb-projekt View Post
The buffer is only needed at the I2S line converter output, if it has no buffer onboard.

I2S Converter --> Buffer --> DAC Module

Data --> Buffer input - Buffer output --> Data DAC module
LRCLK --> Buffer input - Buffer output --> FS DAC module
BCK --> Buffer input - Buffer output --> BCK DAC module
Thanks for the explanation

So in a nutshell it is an improvement to have a external buffer with a dedicated psu for i2s data and before to a dac since we using a long wires...right?

is this justify why DD i2s to spdf doesn't sound 'well' since it's using on board buffer?

will this practice works well to other dac with i2s source in one board together?
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Old 18th December 2010, 01:25 PM   #412
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Quote:
Originally Posted by gabanyayaya View Post
Thanks for the explanation

So in a nutshell it is an improvement to have a external buffer with a dedicated psu for i2s data and before to a dac since we using a long wires...right?

is this justify why DD i2s to spdf doesn't sound 'well' since it's using on board buffer?

will this practice works well to other dac with i2s source in one board together?
As posted before, the used I2S attenuator on my DAC module is designed for 5V TTL levels.
If you use my DAC module with 3.3V I2S converter ICs that have no onboard buffer, it wont work.

Doede has only a SPDIF to I2S converter pcb not vice versa without an onboard buffer, or i missed something.

BTW, the used I2S connection should be as short as possible, independend from the buffer IC.

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Old 18th December 2010, 06:21 PM   #413
roger57 is offline roger57  Canada
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Default Salas Regulator -V Input Connector

Sorry if this post is not in the correct thread!
There is a small issue using non-Wago terminal board connectors on the Salas shunt regulator that should be known.
If you are using this type of connector (2 solder pin, see picture) instead of 4 (pcb solder) pin (Wago) on the shunt regulator PCB, you must do one of 2 things:

1 - You can solder the terminal block to the REAR set of PCB pins to insure the ground plane is connected.
2 - You can solder the connector to the FRONT set of pins, but be sure to jumper the GROUND pin to the READ GROUND pin connector

For example, if it is connected as the picture shows without performing step 1, there will be no negative voltage on the -15V or -5V outputs

Regards,
Gary
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Old 19th December 2010, 02:47 AM   #414
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Quote:
Originally Posted by dvb-projekt View Post
As posted before, the used I2S attenuator on my DAC module is designed for 5V TTL levels.
If you use my DAC module with 3.3V I2S converter ICs that have no onboard buffer, it wont work.

Doede has only a SPDIF to I2S converter pcb not vice versa without an onboard buffer, or i missed something.

BTW, the used I2S connection should be as short as possible, independend from the buffer IC.

well said Oliver....sorry for the confusion
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Old 19th December 2010, 05:59 AM   #415
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Quote:
Originally Posted by roger57 View Post
Sorry if this post is not in the correct thread!
There is a small issue using non-Wago terminal board connectors on the Salas shunt regulator that should be known.
If you are using this type of connector (2 solder pin, see picture) instead of 4 (pcb solder) pin (Wago) on the shunt regulator PCB, you must do one of 2 things:

1 - You can solder the terminal block to the REAR set of PCB pins to insure the ground plane is connected.
2 - You can solder the connector to the FRONT set of pins, but be sure to jumper the GROUND pin to the READ GROUND pin connector

For example, if it is connected as the picture shows without performing step 1, there will be no negative voltage on the -15V or -5V outputs

Regards,
Gary
Thanks for highlighting. I had not noticed this.
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Old 19th December 2010, 10:34 AM   #416
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Quote:
Originally Posted by dvb-projekt View Post

Doede has only a SPDIF to I2S converter pcb not vice versa without an onboard buffer . . .

First, thanks for clarifying the role of the new buffer.

Second, for the record and with apologies for the repetition, the DDDAC range includes a USB-to-I2S module that doesnt have an on-board buffer for the I2S bus and/or an S/PDIF-to-I2S module that does. For obvious reasons (fan-out to between 12 and 60 DAC chips), there is a 74HC125 buffer on each 12-way DAC board. According to the datasheets, its delay is about eight nSecs compared to just under three nSecs for the rather newer NC7SZ125 that Oliver selected.

DDs USB-to-I2S module cannot drive the TDA1541A on Olivers board unless R28 and R31 are removed from the BCK line. If they are, it works fine. However, a better solution might be to reinstate the resistors and use Olivers buffer instead even if DD's board does use 5-volt levels. Im more than happy to try that.

In short, can you put me down for a couple?

Now that Oliver has successfully tested the Tent clock in the Teralink box, the latter's ability to handle 24/96 must mean that it's the device of choice unless constructors already have one of DDs boards going spare (as I did).

BTW, I see that the Teralink also uses the 74HC125 buffer. It might be interesting to see if replacing it with the NC7SZ125 makes for any improvement . . .

HTH

Dave
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Old 19th December 2010, 12:11 PM   #417
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Quote:
Originally Posted by Ryelands View Post
BTW, I see that the Teralink also uses the 74HC125 buffer. It might be interesting to see if replacing it with the NC7SZ125 makes for any improvement . . .

HTH

Dave
In the meantime i have canceled the onboard LC-filter in the +5V line of the standard TCXO
and changed the 74HC125 to the faster 74VHC125 (3.8ns) HERE.
Not as fast as the NC7SZ125 (2.6ns) and all lines in one chip, but with an interesting result.

The lower end gets more punch and the stage open up a bit.
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Old 19th December 2010, 01:59 PM   #418
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Originally Posted by dvb-projekt View Post
The lower end gets more punch and the stage open up a bit.
You got there before me! Interestingly, I've seen both of these effects reported elsewhere as characteristic of reduced jitter. Well done.

I wonder if, for the sake of elderly, ham-handed types like me, it would be possible to cut the old buffer out and run links direct to the new buffer board or even just leave it in place and do the same.
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Old 19th December 2010, 02:07 PM   #419
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If you have the right equipment (smd solder iron) and experiences with it, trust me it is not easy....
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Old 19th December 2010, 04:59 PM   #420
savvas is offline savvas  Greece
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Quote:
Originally Posted by Ryelands View Post
I wonder if, for the sake of elderly, ham-handed types like me, it would be possible to cut the old buffer out and run links direct to the new buffer board or even just leave it in place and do the same.
Cut the legs of the chip. When I replaced my 74CH125 with the 74VHC125 even thought I had a Weller desolder machine just couldn't get the solder out of the holes (double sided pcb, the horror of the diyer )

BTW same results here too, phenomenal soundstage and much clearer sound (DDDAC via DD's USB)

Now, I finally had the time to order the parts for this DAC, building my Mouser list but I wanted to ask if there is any reason why I get into trouble ordering from Partsconnexion the resistors i.e. are PRP resistors better than Dale's RN60/55s ?

Last edited by savvas; 19th December 2010 at 05:06 PM.
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