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Old 28th May 2010, 05:59 AM   #2641
Ryssen is offline Ryssen  Sweden
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Quote:
I am not getting anything at the secondaries.
Is there sound when you play?
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Old 28th May 2010, 07:55 AM   #2642
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Quote:
Originally Posted by stokessd View Post
Nope, you misread my description (Or I didn't make it obvious). There is a PAIR of OPA627's on each adapter board. You only see one, the other is tucked underneath.

Sheldon
Your board looks identical to my two; had to buy the 627s separately for one (the other's using A-20 Transformers) but they're an excellent alternative to the standard op-amps.
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Old 28th May 2010, 08:25 AM   #2643
anbello is offline anbello  Italy
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@stokessd and
@suffolk tony
if you use that DAC with op-amp it's better to test that in this new board they have corrected the error explained in this post.

Ciao
Andrea
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Old 28th May 2010, 08:32 AM   #2644
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Thanks for the information Andrea. I read somewhere that this had indeed been corrected but can't find the relevant forum just yet - might have been a different problem.

My op-amp DAC's now installed in another system in my other home so can't check it for a couple of weeks.
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Old 28th May 2010, 09:04 AM   #2645
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Quote:
Originally Posted by luxury54 View Post
Hi, can you detail this a little bit? the 15k resistor is put in paralel with the signal coming out on the secondaries separatelly on each channel?
also what do you mean by the positive of the secondaries? thanks

Hi,
Here's my layout.. I have now changed the 15K on my previous post with a 10K and got a slight increase in treble response. Will try lower values after some time..

Regards,
Sonny

Click the image to open in full size.
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Old 28th May 2010, 09:56 AM   #2646
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That really doesn't make any sense unless you have high capacitance interconnects hooked up to it. Are you confident in your testing setup?
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Old 28th May 2010, 01:10 PM   #2647
GerardA is offline GerardA  Netherlands
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@sdcz
It looks like your using a soundcard to measure the DAC.
Can it be the inputimpedance of this soundcard is very low?
A serieresistor will help for this but is not the way you will listen to it.
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Old 28th May 2010, 03:35 PM   #2648
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Quote:
Originally Posted by Ryssen View Post
Is there sound when you play?
No sound. But curiously, when I switched it off I had the it still hooked up and I heard a strange sort of sweep across the audio spectrum (from high to low). Maybe some caps discharging?

The transfo should be hooked up like below, correct?

+ from 4398 --> 1
- from 4398--> 4
RCA + --> 5
RCA - --> 8

EDCOR - XSM10K/10K

Maybe the + and - are mixed up, which I will check tonight. Would that matter?
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Old 28th May 2010, 05:20 PM   #2649
Ryssen is offline Ryssen  Sweden
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Quote:
Maybe the + and - are mixed up, which I will check tonight. Would that matter?
There should still be sound.
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Old 28th May 2010, 07:21 PM   #2650
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Got my Gigawork Dac up and running with Jensen transformers and parts from PartsConnexion. Sounds great at least as good as my Esound CD player and it is not broken in yet BUT the oversampling card went - Worked for a while then no sound. Put jumpers in and sound is back. I have heard other having problems with the oversampling card.
I may actually prefer the NOS sound but no way to tell since everything is not fully burned in. Hopefully gigawork will send me another oversampling card.
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