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.
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.
My op-amp DAC's now installed in another system in my other home so can't check it for a couple of weeks.
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
That really doesn't make any sense unless you have high capacitance interconnects hooked up to it. Are you confident in your testing setup?
@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.
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.
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?
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.
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.
I have two now, tried without the upsampler but to me it sounds much more liquid and alive with it. On one I'm feeding I2S directly to the upsampler board, it is glorious, IMHO.
WRT: Dying Up-sampler Boards:
The gigawork dac runs the CS8421 at 3.3 volts for both the logic and digital voltages. This is actually a bad thing, as the digital supply is supposed to be 2.5 volts for that chip. 3.3 volts is within the absolute maximum rating of Vd, but that could be why there are failures.
Just armchair quarterbacking...
Sheldon
The gigawork dac runs the CS8421 at 3.3 volts for both the logic and digital voltages. This is actually a bad thing, as the digital supply is supposed to be 2.5 volts for that chip. 3.3 volts is within the absolute maximum rating of Vd, but that could be why there are failures.
Just armchair quarterbacking...
Sheldon
Last edited:
Ah! I don't have the up-sampling board with this one. Now you have me considering getting a second so I can try it with it🙄 liquid and alive, hay?
No loss as far as dynamics go?
One thing is certain, I need to look at how this I2S mod works/is done😀
Not really... I'm just using a quad core cpu with realtek high definition soundcard, using digital audio out (coax) as source, and phono to stereo jack attached to the mic in as input.
I bet you're right. Ive not had a failure but did notice an anolomy the first week I had it. Guess it's time to cobble something together.
Actually, it's not really a mod. You just pull the 8416 board and plug the I2S in pins 26,27,28,and ground. You only have that one input though. I cut a board down to get rid of everything I didn't need and installed it in an old Philips player. The combo of CDM4, super clock, SAA7210, the DAC board, and the trafos is far surpassing my expectations. It has no shortcomings I can detect, even decaying sounds stay precisely imaged. The dynamics scared my wife, but everything scares her.
Hay, I like the sounds of that 🙂
Gee, I have,'t been looking at this tweak at all really...so the I2S is located in the transport, or is it?
😕
Hmm...going to need some info on my Denon player...
Is it easy to locate in the players?
Gee, I have,'t been looking at this tweak at all really...so the I2S is located in the transport, or is it?
😕
Hmm...going to need some info on my Denon player...
Is it easy to locate in the players?
Last edited:
Hi, you counted just 4 pins going from cd player I2S stream into the DAC board - BCK,WS,DATA and GND but since CS4398 is internally doing oversampling it needs also the MCK (masterclock) from the cd player to be transfered together with the rest of the I2S lines.How come that it is working without it?
Damn! I can't find anything resembling a service manual for my DVD 1710...
Hmm...would you just tap the I2S where it goes into the players DAC chip? or well before that?
Edit: this is going to be harder than I thought.
Hmm...would you just tap the I2S where it goes into the players DAC chip? or well before that?
Edit: this is going to be harder than I thought.
Last edited:
Indeed, 3.3V for VD in the Gigaworks board. I never remarked it, reading the schematics.
Hard stuff, dear Gigaworks guys!
I will modify my subboard for 2.5V
Franz