Checking from Germany, your store does not offer products, like, at all?
(Switching to USA will show them, so it has to be intentionally, I guess?)
(Switching to USA will show them, so it has to be intentionally, I guess?)
Germany is a special case. They have blocked the Aliexpress shop if one doesn't collect all the documents(about all materials used, include aluminum case alloys etc) and doesn't pay for the special certificate required. Other countries don't ask that, as usual CE certificate is enough.
The second LPF version proto is tested. H2 performance(-150db is a good result for SE) and noise were improved for SE outputs. Now SE loses less than 1db of the original 9039S THD+N, -125.2db/125.8db.
9039S->LPF at the Left SE output 4.6Vrms, APU +6db, that test shows the THD+N(<-128db) performance for SE applications.
The same test, but APU 0db, to show the THD performance of SE applications.
9039S->SE Left 3.5V APU 0db, THD test. Ultra-high performance balance/unbalance converter, due to highly symmetrical structure and delicate PCB layout full 9039S performance translated to the unbalanced output with virtually no losses. BTW, 100mA outputs may drive headphones.
The same test but APU 6db, THD+N performance test.
9039S->SE Right 3.5V APU 0db, THD test.
The same test but APU 6db, THD+N performance test.
9039S->LPF balanced output 4.6Vrms, THD performance test, close to -155db, all harmonics about -160db or less.
9039S->LPF balanced output 7.75Vrms, THD+N performance test, less than -131db(limited by APU).
9039S->LPF at the Left SE output 4.6Vrms, APU +6db, that test shows the THD+N(<-128db) performance for SE applications.
The same test, but APU 0db, to show the THD performance of SE applications.
9039S->SE Left 3.5V APU 0db, THD test. Ultra-high performance balance/unbalance converter, due to highly symmetrical structure and delicate PCB layout full 9039S performance translated to the unbalanced output with virtually no losses. BTW, 100mA outputs may drive headphones.
The same test but APU 6db, THD+N performance test.
9039S->SE Right 3.5V APU 0db, THD test.
The same test but APU 6db, THD+N performance test.
9039S->LPF balanced output 4.6Vrms, THD performance test, close to -155db, all harmonics about -160db or less.
9039S->LPF balanced output 7.75Vrms, THD+N performance test, less than -131db(limited by APU).
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I had hoped that the Bal2Ubal stage of Cosmos LPF could produce a nearly ideal IMD test stimulus. For that reason, I added one more dip-switch poles(9 and 10) to connect the same stage to both the Left and Right DAC's outputs, so the differential amp works as a mixer of 2 freqs. However, I see pretty much the same IMD performance as 9039S tied with no mixer to the Cosmos ADCiso with 1ord HPF(22nF in serial right in the cable).
yes, the holiday is finished and my order will be soldered in a couple of days.
So, does this mean definitely, absolutely, positively mean that there won't be a Cosmos DAC, just a Cosmos DAC Lite (9039S)?
I wanna be certain before getting my order together...
I wanna be certain before getting my order together...
My goal is to combine all the modules(APU, DAC, ADC, LPF en scaler) in one housing with USB isolator/hub and stand alone low noise power supply and other in/output connectors.
That should be very nice. Maybe you could even add a common clock.
The only thing I'd be concerned about is whether you'd get ground loops between them already. All of them contain DC/DC converters, but only the ADCiso has one that offers galvanic isolation. so you'd have a double ground path into all of the other components. Balanced signalling should take care of most of the common mode stuff but not necessarily at the frequencies the converters operate at.
The only thing I'd be concerned about is whether you'd get ground loops between them already. All of them contain DC/DC converters, but only the ADCiso has one that offers galvanic isolation. so you'd have a double ground path into all of the other components. Balanced signalling should take care of most of the common mode stuff but not necessarily at the frequencies the converters operate at.
Until yet no ground loop problems with all the modules. APU and ADC are powered by powerbank. DAC has supply from PC.
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