alright - why not tan ?I never use sine gen, only cosine
actually - since THD is basically non linearity I could also imagine to do a static calibration of the transfer function. but guess it not really effective.
alright - why not tan ?I never use sine gen, only cosine
Hi IVX,
I got the COSMOS ADC yesterday and am very happy with it. Workmanship, THD+N, delivery time and contact with Sunny !!!top notch!!!
I have already measured my DACs and PREs and now I would like to measure my amplifiers.
I have a TPA3255 here, which is a Class-D bridge amplifier with about 25VDC between the outputs and GND. What is the best way to connect it to the ADC? The ADC can handle 43Vrms at the 2.5mm input. But I still have worries about the 25VDC. Because the amplifier and the ADC are connected via ground. Or is this not a problem, because the input signal is divided in the ADC and then finally AC coupled?
43Vrms are possible with the 10Vrms switch setting? Are then in 4.5Vrms switch setting, only 19.35Vrms at the 2.5mm input allowed?
tan doesn't look similar to sine yet..
View attachment 160337
No more than 10VDC is allowed, hence you have to add non-polar caps after your DC-biased amp or as recommended above, use battery-powered laptop.Hi IVX,
I got the COSMOS ADC yesterday and am very happy with it. Workmanship, THD+N, delivery time and contact with Sunny !!!top notch!!!
I have already measured my DACs and PREs and now I would like to measure my amplifiers.
I have a TPA3255 here, which is a Class-D bridge amplifier with about 25VDC between the outputs and GND. What is the best way to connect it to the ADC? The ADC can handle 43Vrms at the 2.5mm input. But I still have worries about the 25VDC. Because the amplifier and the ADC are connected via ground. Or is this not a problem, because the input signal is divided in the ADC and then finally AC coupled?
43Vrms are possible with the 10Vrms switch setting? Are then in 4.5Vrms switch setting, only 19.35Vrms at the 2.5mm input allowed?
just to confirm - are the charge / discharge currents for those caps save for the ADC front end?No more than 10VDC is allowed, hence you have to add non-polar caps after your DC-biased amp or as recommended above, use battery-powered laptop.
do you have a source? I could not find it - only with request for NDA:So far I have no even single case of burned input of ADC but the probability to kill that does exist. ESS disclosed the datasheet for ES9822 you can take a look.
Clicking on the 9822 hyperlink on this page will download the datasheet: https://www.esstech.com/products-overview/analog-to-digital-converters/do you have a source? I could not find it - only with request for NDA:
thx this workedClicking on the 9822 hyperlink on this page will download the datasheet: https://www.esstech.com/products-overview/analog-to-digital-converters/
So far I have no even single case of burned input of ADC but the probability to kill that does exist. ESS disclosed the datasheet for ES9822 you can take a look.
good to know. also that the influence is small enough to impair THD.My 9822 inputs have additional clamping diodes protection.
1) no, DSD there made from PCM.a few questions to IVX:
- do you plan to support DSD recording in ADC?
- Same question to your unreleased Cosmos DAC. Does it support dsd playback?
- Is the APU single channel or dual? I can't tell it from the rendering. What's the connector?
- APU may work great as a mic pre. but how about phantom power?
- Any plan to make ADC and DAC as one device? If not, how can their clocks sync together?
That is good news. This is the dream device I'm looking for. Looking forward to it!3) single, and today I finished APU modification - LPF is deleted, 48VDC phantom power added. Also, I bought cheap but seems quite typical Rode NT1 to find the optimal gain APU's switch +?db/+60db. 3.5mm jacks.