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Old 23rd March 2012, 03:26 AM   #41
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Thanks Sonic_real_one for a good answer I will upgrade to parallel sooner or later, but wont be doing it just now! Maby changing the caps to :P

So the dac has a OP275. I havent heard it yet, but i want to buy other opamps that are compatible and try them out!. Any ideas on whats good out there? i have been searching a little and found that many liked these:
AD825AR
AD8620
OPA2132
LM4562
AD8599

Any thoughts?
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Old 23rd March 2012, 09:18 AM   #42
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This looks quite similar for 438 RMB or about 70 USD. Add Chinese internal postage plus about 7.5% Taobao agent fee and it would still end up being cheaper than eBay. But what is that little add-on board in the upper-left corner of the eBay photos?

http://item.taobao.com/item.htm?id=13378154810

Last edited by dhalbakken; 23rd March 2012 at 09:35 AM. Reason: forgot link to item mentioned
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Old 23rd March 2012, 12:29 PM   #43
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Quote:
Originally Posted by dhalbakken View Post
This looks quite similar for 438 RMB or about 70 USD. Add Chinese internal postage plus about 7.5% Taobao agent fee and it would still end up being cheaper than eBay. But what is that little add-on board in the upper-left corner of the eBay photos?

http://item.taobao.com/item.htm?id=13378154810
Cant access the link.
THe addon? you mean the USB board?
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Old 23rd March 2012, 03:35 PM   #44
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Here is the link again.

WM8741模拟味DAC解码板,带CS8421升频(同轴,光纤输 氚妫-淘宝网

Yes, it must be the USB board. It is not shown in the taobao photo, but the text says it includes the USB board at 438 RMB. I guess if I were to order from taobao, I'd first check for sure that the USB board is included. Thanks!

Click the image to open in full size.
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Old 23rd March 2012, 10:17 PM   #45
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Dhalbakken, you have noe need for the usb board, since it has an outdated Usb chip, your better of buying the Tenor 7022 board from ebay and use that board insted. Yo see on the top left corner of the board, the two free pins behind the pulse thingy that says cn2 is where you should connect it. The tenor board is sold complete with coax out, but just remove that and solder in on this board

Tenor board.
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
Got my tenor board today! But as seen in some of these photos, what are all the connections? many short names i dont understand anyone who knows?

IMG_4550.JPG

IMG_4551.JPG

IMG_4552.JPG

IMG_4554.JPG

Last edited by solviken; 23rd March 2012 at 10:44 PM.
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Old 24th March 2012, 12:03 AM   #46
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Quote:
Originally Posted by solviken View Post
i have been searching a little and found that many liked these:
AD825AR
AD8620
OPA2132
LM4562
AD8599
Any thoughts?
I did try the last three.
LM4562 is my preferred OpAmp (mainly because it has also a DIP8 capsule), but I have left the AD8599 (surface mount) in a Denon 2910 because it performs well too. Didn't feel the need to replace it with LM4562 (I do have plenty of those in SMD).
OPA2132 was... ok. But for some reason didn't make me want to keep it.

Last edited by SoNic_real_one; 24th March 2012 at 12:05 AM.
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Old 2nd April 2012, 12:26 AM   #47
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Default The DAC arrived!

Ok, the DAC that the OP showed, NOT the one just spoken of, arrived a few days ago. Today I got it fired up. Had to find appropriate transformers in my iron mine. Since the epay seller did not include the requested schematic, and the one on the sale page is too low res to be readable in detail, I played it safe with the voltages and spent the time to find the required 10-0-10 AC transformer for the two lower voltages, and a 15-0-15 for the higher voltage supply. Took a while to pick 'em out.

I decided to slap the whole affair on a square bit of Luan plywood I had sitting in the warehouse. True breadboard style... and to make it right, I picked out some nice 3/8" x 3/8" nylon spacers to put between the PCB and the wood board.

All went well, and I brought it from the lab over to the listening room (LR), and fired up Jimi Hendrix Albert Hall boot CD on my usual DAC. That's a BB, the last linear type they made, geez I can't recall the stupid number now sorry, with the BB DF and a Crystal SPDIF receiver, gyrator filter on the analog side and a jfet/mosfet x-coupled buffer on the ootput.

Then I switched over to the China DAC. Nada. No output.

Brought it back to the bench. Figured I check the soldering.

Oooops. User error. The 3/8" diameter spacer had shoved the edge of the TI SPDIF input cheep over and cracked the solder off many of the pins. Ooog. So I shoved the chip back into place, slammed my head against a wall two times, and brought it back to the LR. Nada, nothing, zilch. No SPDIF LED.

Brought it back to the lab. Hmmmm... maybe I missed a pin? Sho'nuff! Missed a pin. Repeated scenario. Nada. Grrrrr... maybe i blew it up? Try the USB in? Right, good idea. Tried the USB. USB LED lights. Nada. Hmmmph. Ok, forgot to PLUG IT IN!! Plugged it in, voila! Music in the lab.

Ok. Turned it off. Flipped it over after removing the SCREWS AGAIN... 5x eye loupe. Bright light, exacto knife on chip pins. Yikes! Some are not soldered!! Resoldered the ones not connected.

Repeat. NADA!! Back again. Reinspect. Grrrrr... change perspective, rotate board, look again. Gosh darn one pin looks soldered but isn't! Resoldered, with fresh solder on tip...

Back to LR. Ahhhhh... sound!

Ok, virgin unit, zero hours run time, no look at schematic to see if there are ANY caps that need changing for the better, or resistors for that matter. Stock JRC4558 opamp in output hole.

Here's what I heard.

Not bad. Nothing glaring, nothing glaringly bad, highs are smooth enough. Decent sound stage.

However, the unit emphasizes the upper mids, lower highs, or fails to reproduce (either way) the lower mids and bass. Dynamics seem ok with a quick listen.

Compared to my reference unit, this one is a bit anemic and lacks a certain warmth, although it doesn't do anything terribly objectionable that makes me want to run from the room screaming (as so many DACs have made me feel like doing, fyi).

This is a work in progress report. Not run at all, opamps need to be changed out for sure, and maybe the PS could be changed for the better too.

I was going to run the thing off an outboard regulated bench supply rather than the AC in it normally takes, and see how that works out, but I had to repair the unit first, which I did. But second, not first.

Conclusion: My take on it is that for the money, it does nothing bad, save the tonal balance part, so might be ok for what it is. With changes in the output opamps and maybe the PS it may or may not sound rather better than it does now. But the good part is that it does not spit or sound hard and mechanical. I think the JRC4558 are contributing significantly to the perceived sound now. Conjecture at this point, but I think that will be borne out.

Pretty good for <$100.

(it's not a horse race with my main DAC at this point, fyi)

CDs used for brief listening:

Leann Rimes "Blue"
KD Lang - gosh, I dunno, the one with "Pulling Back The Reins"
Fairfield Four - the one with "There Must Be A City" (think it is the 2nd album?)

And a bit of the Hendrix at Albert Hall...

_-_-bear

EDIT: SMT workstation - high on my things to buy.
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Old 2nd April 2012, 12:38 AM   #48
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For clarity,

the seller is "zoe_tsang" on ebay

below are pix of the board.
mine was slightly different, no trimmers for one thing,
and mine is V2.0

he did not include the schematic despite several requests.

the ebay links others have posted, over time will go away and not be viewable any longer.

Upper left in the bottom side pix is the input chip that ran into the spacer...
oh, the two vregs upper right on top side run a bit hot, will need heatsinks...

_-_-bear
Attached Images
File Type: jpg CHINA DAC PIX.JPG (73.9 KB, 379 views)
File Type: jpg CHINA DAC BOTTOM PIX.JPG (63.6 KB, 378 views)
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Old 2nd April 2012, 12:47 AM   #49
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Thanks for the story. I am waiting one DAC from China too... CS4398 chip thou, bought the same, for my curiosity.
I guess I will have to inspect the solderings before firing it
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Old 2nd April 2012, 12:54 AM   #50
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I also had ordered a kit for zoe_tsang on ebay. Took over two months to get here, wasn't very happy. Anyways, the kit sounded fine once I threw away the JRC opamps and replaced them with some OPA637s. This kit was version 1.5. I also ordered the "same" kit from a different vender on ebay and it was version 2.0, again I threw out the JRC opamps and replaced with OPA627 on this model. Both sound great (I use them as USB sound cards for my PCs) but I feel like there's more these can produce. Maybe a total re-cap with some known genuine parts?
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