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Old 27th August 2012, 11:09 AM   #401
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where can we buy BG N / NX 4,7 uF 10 uF 47 uf
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Old 27th August 2012, 12:06 PM   #402
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Nowadays you can almost only buy them from people (Ebay) that charge outrageous prices for them. They were expensive from day one but by now they have gotten "S2" status

To me the N and the NX HiQ are the best you can use in good audio.
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Last edited by jean-paul; 27th August 2012 at 12:21 PM.
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Old 27th August 2012, 03:57 PM   #403
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Quote:
Originally Posted by Marlowe View Post
I just enclosed the DAC in a small box. The wires are re-arranged as close to the enclosure as possible.

The transformer and the rectifier diodes (MSR860s) are put in another aluminum box.

In addition, I swapped the C8 with a Nichicon SMD tantalum 4.7uF capacitor. The sound became slightly cleaner to my ear.
Marlowe, why don't you put the diodes inside the same box with the DAC? so that from the PSU Box to the DAC Box the power transmission is in AC...

Is there advantage of carry it in DC over AC? I thought carry electricity in the longer cable would be beneficial in AC, since AC do not induce electro magnetic stray....?
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Old 27th August 2012, 04:11 PM   #404
6h5c is offline 6h5c  Netherlands
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Hi,

I would recommend to put the smoother cap in the PSU box. The way you have it now, the charging pulses to the smoother cap are carried over the long PSU cable. Feed the DAC the raw DC and regulate it locally.

Ray
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Old 27th August 2012, 04:24 PM   #405
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Marlowe I missed your post. Neat build again but Ray has a very good point regarding the charge pulses. Either go for a one box solution or make a separate DC supply. AC does pick up RF more easy than DC IMHO. So DC is the way to go. As a sidenote: switching DC is not favorable for known reasons. And I would not put my money on SC transformers. You were telling that the EUVL DAC and ours sound alike with all these nice parts on the EUVL DAC ? That is a positive message. Will you be tweaking our DAC too ? Please let us know how things develop.

I am glad the 4.7 F tantalium cap worked out well. I guess it should be changed in the BOM and in the schematic. So to all readers: change C8 to 4.7 F tantalium as it will do better work than the original part. I have asked our COO to change this in the BOM/schematic if he can find an opportunity in these harsh economic times. We work in shifts now to help all our PCB buying customers. There is no limit in guaranteeing satisfaction to you all. You see our newly acquired marketing manager points me in the right direction.

And Syklab is called Syklab not Skylab but that can have been an error on his part
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Old 27th August 2012, 04:48 PM   #406
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Calling Buzzforb from Burlington, NC ... Buzzforb, how is progress on the DAC ?
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Last edited by jean-paul; 27th August 2012 at 04:57 PM.
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Old 27th August 2012, 05:06 PM   #407
syklab is offline syklab  Hong Kong
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Hi JP,
I start using Syklab as my call sign for over 15 years already, originally I wanted to use skylab for my domain name but that was taken so I changed it a bit to Syklab.

By the way, I pickup few of these POLYSTYRENE FILM CAPACITOR 10000pF 63V +/-1% to try it on the S/pdif input see if it is good idea or not.

Click the image to open in full size.


Best regards.
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Old 27th August 2012, 05:25 PM   #408
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What's in a name ? I personally do not fully understand why "handles" have been invented or why I would have to pick an "internet name". In once had a good laugh when a friends 15 year old daughters computer had problems with email. I changed the settings and asked if she could send a test email to her father. I was watching the screen of her fathers laptop computer together with her father and there it was : an email from "sexatthebeach19XX@hotmail.com.....Two red faces.....

So I use my name with which I was born. The KISS approach maybe.

I would not be surprised if the styroflex cap performs worse than SMD parts in this application (inductivity, too large etc.) but let me know how it works out. A PPS SMD would be nice to try (when I think of it).

Like this one:

http://il.farnell.com/panasonic/echu...16v/dp/9695028
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Last edited by jean-paul; 27th August 2012 at 05:52 PM.
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Old 27th August 2012, 05:43 PM   #409
syklab is offline syklab  Hong Kong
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Well, when we were kid, we always use handle when playing with ham radio, don't know why but they all did that.
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Old 27th August 2012, 05:55 PM   #410
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Yeah I know everybody does (except for a few) but sometimes I ask myself where the fun is in "satan666", "iron eagle", "black knight", "Testarossa4life" etc.

Then you see the guys in real life and they turn out to be wimpy scooter driving pale faced gaming nerds
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