In the same time, I think STEPS is beautiful, but if someone wishes to squeeze the last bit out of the hardware/software, the arta spectra analysis is better..
The first shot is a spectra with the settings of 44k sampling, 997Hz, -11dB gen level, +4dB analog setting, with maxed out spectrum parameters
Then there is the fact that still the full system is limited by the Dac output.
The second shot is showing a 10kHz Victor's osc response.
The first shot is a spectra with the settings of 44k sampling, 997Hz, -11dB gen level, +4dB analog setting, with maxed out spectrum parameters
Then there is the fact that still the full system is limited by the Dac output.
The second shot is showing a 10kHz Victor's osc response.
Attachments
The DAC limits the 1616M. The AK5394A is still the lowest distortion ADC made. The 1616M implementation is very good. Opamp upgrades will help a lot. The oscillators look like they can be swapped directly for the Crystek's.
Maybe I'll attempt another mod (two smoking hulks so far. . . ) I have parts but the FPGA swap did not work.
Maybe I'll attempt another mod (two smoking hulks so far. . . ) I have parts but the FPGA swap did not work.
Hi Joseph K,
Nice performance.
Can you show 10kHz (Victor's osc) with 192kHz sampling and graph up to 100kHz? I'm interested in higher harmonics and noise shaping behavior.
It's USB. Strangely, I have the impression that the generator side doesn't really benefit from the better opamps, just the recording side.
Why not LM4562? Idle current. But I just might give it a try, although the 1602 just mentioned also seems a fine candidate, at lower Iq. Decisions, decisions.
Last edited:
That 1616M can't be beat it seems, great results you show. Unfortunately, I work from a laptop so that rules it out.
Vacuphile,
How high voltage do EMU 0404 supply to OP-amps?
I'm asking because supply is 4,3V on my Focusrite 2i2. If that's the case on EMU then OP-amp min voltage must be considered when choosing replacement OP-amps.
How high voltage do EMU 0404 supply to OP-amps?
I'm asking because supply is 4,3V on my Focusrite 2i2. If that's the case on EMU then OP-amp min voltage must be considered when choosing replacement OP-amps.
Seems like +/- 6 v DC
You may find more details about EMu 0404 USB here
E-MU 0404 USB mod wiki - diyAudio
He's talking about the 0404, the 0202 doesn't use an external supply. It has one less preamp and doesn't have phantom power.
Unfortunately, practically none of the modern interfaces today are USB powered and don't have this "goodness" inside... and their specs don't even come close.
Last edited:
Agreed. I thought we were talking about the 0404.
I think you mean that the modern interfaces are USB powered, and also have made the design choice to run everything but the phantom power off of 5 v USB power.
I have a few of these gems and they are pale shadows of the 0404 USB performance-wise, as you say.
Aha 0404, sorry my mistake.
Here is my 2i2, signal from Viktor's 10kHz osc:
It's possible to reach -100dB 2nd by lowering input and increase gain (noise penalty). I bought the 2i2 mainly for acoustic measurements and for that it will suffice. Surface3 + 2i2 + MIC = light portable solution.
Now we are awaiting Lynx e22 results.
Here is my 2i2, signal from Viktor's 10kHz osc:
It's possible to reach -100dB 2nd by lowering input and increase gain (noise penalty). I bought the 2i2 mainly for acoustic measurements and for that it will suffice. Surface3 + 2i2 + MIC = light portable solution.
Now we are awaiting Lynx e22 results.
My bad. Yes, I wanted to mention that they ARE all USB powered and that there isn't anything that can match the 0404 performance wise. BTW, the phantom power also runs off the 5V USB, probably using a DC-DC converter or voltage multiplier circuit.
For acoustic measurements, lower specs will suffice. But when you also use the interface for measuring equipment like DACs and like, those USB devices often aren't good enough.
Last edited:
Yes, I agree. For equipment measurements I'm looking for better solutions. Right now I'm thinking E22 or possibly QA405 (when will it be released?).
Vacuphile,
Also i'm using a laptop. The emu system is dock unit +a pcmcia cardbus card.
i love my old lenovo z61..
AKN,
Here it is the 192k spectra. But first, for comparison and better view i had repeated the 88k shot, with linear scale. Then the 192k, with the same level setting. Lastly, 192k at a higher level, which shows better where the adc distortions are coming in.
It is not that clean any more! That ~75khz junk is the dxternal 48Vdc, switching power supply for the docking station. It is picked up externally, by just connecting the oscillator. The internal topology is full balanced, and do not see this common mode junk. But victors oscillator is single ended, and i had to upset the simmetry at the input connector..
one way to avoid it could be an external, screened single to balanced converter --or a linear power supply..
Also i'm using a laptop. The emu system is dock unit +a pcmcia cardbus card.
i love my old lenovo z61..
AKN,
Here it is the 192k spectra. But first, for comparison and better view i had repeated the 88k shot, with linear scale. Then the 192k, with the same level setting. Lastly, 192k at a higher level, which shows better where the adc distortions are coming in.
It is not that clean any more! That ~75khz junk is the dxternal 48Vdc, switching power supply for the docking station. It is picked up externally, by just connecting the oscillator. The internal topology is full balanced, and do not see this common mode junk. But victors oscillator is single ended, and i had to upset the simmetry at the input connector..
one way to avoid it could be an external, screened single to balanced converter --or a linear power supply..
Attachments
- Status
- Not open for further replies.