Recent content by Antonio Di Motta

I have the Raspberry 5, but I haven't had a way to test compatibility with my sound card. Unfortunately, due to the lack of low-noise LDO regulators, I was unable to update the sound card and I am concentrating on creating the new motherboard of the analyzer ver. 4.0. At the moment I'm very late...

If you feel like wasting some time you can read my post on how to use raspberry to create a good measurement tool with REW. There you can find some suggestions on how to do it all. https://www.avnirvana.com/threads/make-a-good-measurement-system-with-rew-and-raspberry.5592/ If you have any...

Hi, I designed two other versions of the card trying to improve some aspects but at the moment I couldn't make them due to lack of time and above all of chips. I hope the semiconductor market recovers to have the chips I need to make this board. Greetings from Italy Antonio

Certainly yes, the circuit reported in the documentation is perfectly functional also with REW.

Good evening Wes Brenner, I am very pleased that there is someone who appreciates my sound card. My intention was to create a kit for acoustic enthusiasts to build their own measuring instrument using what in my opinion is the best free software available (REW). Unfortunately the pandemic and...

At the moment my solution provides the S.O. Raspberry OS 32bit version, with the 64bit version I have some problems with waterfall graphs. A greeting

In the REW_linux_no_jre_5_20_14ea17.sh version the impedance measurement works correctly. Thanks John for the quick fix. I wanted to tell you that REW continues to work very well on the Raspberry Pi 4. Thanks again, greetings from Italy.

I tried the latest versions of REW and when I measure the impedance the program crashes and I have to close it. The error also occurs when I carry out the impedance calibration. I attach the log files. A greeting. Thank you

I noticed a problem on the distortion measurement, the THD measurement of an external BF generator changes with the activation of the internal REW generator even if not connected to the audio input. I have attached two photos where it is shown that with the same spectrum without active...

I have been working on it for many years even if not very assiduously but I hope to be able to complete the entire project of the 4.0 version of the instrument between the end of 2022 and the beginning of 2023. The big delay mainly depends on the realization of the sound card as the ones I...

Unfortunately the latest version of the card with changes that should give some further improvements was not built due to lack of chips. I'm currently busy building the instrument's motherboard, I'm well underway and hope to build it soon. Thanks for the attention. Greetings Antonio

I recovered this graph where you can see the performance of the card in this case with an input signal level at -3dbfs

my sound card VT board is silent let's say that with RTA the noise level remains at around -140dbfs, but it was difficult to reach a particularly low level of distortion around 0.00037% at 1Khz with input signal at -1dbfs . This value when compared to the HiFi Berry dac + adc card is much...

Sorry, I haven't tried any USB microphone solution. Greetings Antonio

Interesting your speaker, well built. I have seen some measurements made with REW and I must say they have a very linear response, great job. As for the two microphones, they have very similar performance I use XREF20. Greetings Antonio