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E1DA Cosmos ADC
- Thread starter mansr
- Start date
IVX
Major Contributor
hm, it was reliable before as well, only the noise is higher vs 384k..44.1k.
do you mean the dip switch level is too high?
Or actually test signal (input)?
How can you tell?
IVX
Major Contributor
I guess so. To measure a common 4Vrms output (I assume it is what we get from the D-6), you need to adjust the input (most likely, use the 3.5Vrms switch if Mono, or the 4.5Vrms one if Stereo) to get something closer to 0dBDFS in REW RTA.
Ok when you said input level is too high and you need to get closer to 0dBFS, it was confusing as those are contradictory
But if you mean dip switch level not input signal, it makes sense
Yep, I then mentioned 3.5Vrms and 4.5Vrms, so I was talking about input sensitivity switches/ranges/levels, not "input" in REW.
Anyway, did you try it?
So bought one from Linsoul and have now tried on 3 computers. None recognize it. The back panel LED initially is solid and starts blinking steadily after a few seconds.
Have installed the tweak app and it cannot connect.
Any suggestions?
Have installed the tweak app and it cannot connect.
Any suggestions?
IVX
Major Contributor
Hm, when did you buy that, date? Did you try another USB cable, a shorter one? Different USB ports? Windows 10, Mac?
IVX
Major Contributor
ooh, a lot of nice-looking USB cables even have no shielding..
wayne_handzus
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- Oct 26, 2021
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wayne_handzus
Member
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Hi Ivan, how's it going
hope you stay healthy.
oh was Cable
looks like attachment of new firmware filename 768K
graph you posted is 360 K nyquist
for me this is very good news,
thanks very kindly sire,
Hope To purchase adc soon.
Later Good Man
Wayne
hope you stay healthy.
oh was Cable
looks like attachment of new firmware filename 768K
graph you posted is 360 K nyquist
for me this is very good news,
thanks very kindly sire,
Hope To purchase adc soon.
Later Good Man
Wayne
wayne_handzus
Member
- Joined
- Oct 26, 2021
- Messages
- 8
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- 0
re noise coming up when freq inceaase,
seems to say capacitive reactance has decreased,
the noise looks like various mixture of radios and what not coming from electric common ground into the circuit enclosure, not seeing the schematic and cannot hardly try desoldering caps or changing value when they are surface mounted.
this would require a peg board or caps attached with alligator clips with the culprits removed,.or not placed yet on protoType.
not now looking at the circuit,.
as you know, when we shunt signals to ground, existing the same path back into the circuit from ground,
(ground, where all of the noise is) unless we have an absolutely clean ground,. not likely with all of the raido not ,i say again my last, radio,over,
on the air,out. ground is a giant antenna.
surely you know how to test tone circuits of this type at least aproximate= aye figured . again good job! well done! friend wayne here in San Francisco
seems to say capacitive reactance has decreased,
the noise looks like various mixture of radios and what not coming from electric common ground into the circuit enclosure, not seeing the schematic and cannot hardly try desoldering caps or changing value when they are surface mounted.
this would require a peg board or caps attached with alligator clips with the culprits removed,.or not placed yet on protoType.
not now looking at the circuit,.
as you know, when we shunt signals to ground, existing the same path back into the circuit from ground,
(ground, where all of the noise is) unless we have an absolutely clean ground,. not likely with all of the raido not ,i say again my last, radio,over,
on the air,out. ground is a giant antenna.
surely you know how to test tone circuits of this type at least aproximate= aye figured . again good job! well done! friend wayne here in San Francisco
IVX
Major Contributor
wayne_handzus, not sure if I understand but if any questions you are welcome.
- Joined
- Feb 5, 2019
- Messages
- 46
- Likes
- 45
I thought phono SQ on the recording sample was exceptionally good, at least on my desktop system immediately above my video display, the best boom box I ever heard, a JVC RV-DP-100, 4cm full range + active 8cm subs.
I have a DIY DAC with 1Vrms output (very low) and 4k ohm output impedance.
My SMSL SP400 headamp/pre out, has 47k ohm input impedance (very good) but even at max volume I can't boost this output voltage.
Cosmos ADC minimum input sensitivty is 1.7V rms.
How can I boost DAC's output transparently to 1.7 Vrms?
I looked at transparent preamps but Topping Pre90 is king but has 2k ohm input impedance (too low for my case).
cc @VintageFlanker @pkane
I have it but i then have 14 Vrms which is too high for Cosmos ADC
Even if I feed that into my SMSL SP400 and dial down volume, i get hopelessly bad THD+N of 70dB
Direct connection of DIY DAC (1 Vrms) into Cosmos ADC 1.7Vrms gives THD+N of 100dB. Even if routing through the SMSL SP400 gives the same (transparent preamp)
So something is going wrong with APU in the chain
Not necessarily faulty unit but cant workout why SINAD takes such a hit
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