Cosmos APU is a single channel, MONO device. Better to use NP aka non-polar aluminum caps.
My mistake, I found some Muse Bi-polar caps that I will use.
When I test the circuit in spice, than I notice a huge voltage spike when the "PSU" is turned "ON" or "OFF". Is it a good idea to add a Relay to the circuit to enable and disable the output from the APU when the PSU is turned "ON" or "OFF"?
When I test the circuit in spice, than I notice a huge voltage spike when the "PSU" is turned "ON" or "OFF". Is it a good idea to add a Relay to the circuit to enable and disable the output from the APU when the PSU is turned "ON" or "OFF"?
oops, I didn't say about it yet? Cosmos ADCiso has 2 USB-C connectors, one for the power, and another for UAC2 USB interface i.e. DATA.
The DATA connector is isolated with a few pF of barrier(totally with the housing is 8pF), hence, GND loop sensitive setups will not require running Cosmos ADC on the battery-powered laptop. Also, slightly reduced H3 at 10kHz(down to -123db). Parts are already on the SMT factory, so ADCiso will be available next 3-5 days with 99% probability. Cosmos Scaler expected a few days later after ADCiso.
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Hi IVX ... thanks for your feedback (I actually thought you might have written about it earlier in the thread so I decided to just let i be).
BTW: is there any way the ADC can be used to record DSD? I know the ADC itself can do so but have you made provisions for this in the software?
Cheers & have a good day,
Jesper
BTW: is there any way the ADC can be used to record DSD? I know the ADC itself can do so but have you made provisions for this in the software?
Cheers & have a good day,
Jesper
ES9822 may only convert PCM to DSD, I think you can make it on your PC better.
Regarding Cosmos ADCiso I've updated the product page but the difference is minimal https://e1dashz.wixsite.com/index/cosmos-adc
Regarding Cosmos ADCiso I've updated the product page but the difference is minimal https://e1dashz.wixsite.com/index/cosmos-adc
Thanks again for your feedback, however, are you sure about the ES9822 converting PCM to DSD? In the datasheet (third paragraph in the introduction) it says that the ES9822 supports "or native DSD output". No doubt you are more familiar with this ADC - but to me "native DSD output" would mean a non-processed DSD signal. And if this were the case it may be quite interesting for recording as well as testing.
I cannot elsewhere in the datasheet see that the DSD signal should be processed, but I reckon there could be something I have missed .. ?
Cheers, Jesper
I cannot elsewhere in the datasheet see that the DSD signal should be processed, but I reckon there could be something I have missed .. ?
Cheers, Jesper
Right ... it does indeed not look much like a native DSD output ... Thanks for taking the time to cut-out the figure & replying - quite contradictory information I would say, and, yes, I would also prefer using a PC for processing in this case.
Cheers, Jesper
Cheers, Jesper
The Native DSD is a data format (c). Your PC(Foobar2000) may play PCM files to the native DSD as well.
an important note about Cosmos ADCiso: Please do not use a screwdriver to fix the DATA USB-C cable, use your fingers instead to avoid overstrength and damage to the USB-C socket.
Hmmm... Already received my Scaler.
True story: Sunny shipped the Scaler on Monday. One of our dogs needed some eye drops, which we ordered on Tuesday morning from a place within 500 km of here, fast delivery. They both arrived on Thursday. I suspect that the last ~100 km is the longest.
Cosmos ADCiso Grade 0, MONO mode reaches THD+N@1kHz -125db. I.e. peak of APx555b THD+N performance level. The sine source of proto of Cosmos DAC, Cosmos Scaler as a buffer with 0db gain, 10Vrms balanced output. Cosmos ADCiso Grade 0 was a random one, just first from the batch, not the best of Grade 0 at all.
1kHz LPF, residual THD+N is about -137db(estimated, I've no rig to measure).
BTW, AP2700 software is always a bit more optimistic(-.2-.3db) than REW in terms of noise and THD+N measurements.