Recent content by Antonio Di Motta

I have verified a difference in the noise level when enabling the THD measurement with the average function active. I attach two RTA screens with a 1 Khz -4dbfs signal, the first with the THD measurement and the second without, you can see a notable difference in the noise level which is much...

Beta version 55 works fine. Thank you John

Hi Jhon, I attach the sound card and measurement settings. The levels of both channels are identical, I verified both by measuring the response with REW and with laboratory instruments. I inform you that up to version 5.40 beta 29 everything worked well from version beta 30 it started to give...

here are the screenshots of the levels measured by Rew

Sorry not 59db but 3db I checked with but they are identical -10.42 db both channels.

Hello Johon I found a problem with the impedance calibration. The measurement works by manually setting the Rsense Rinput and Rleads parameters while the automatic calibration by performing the three steps Open circuit Short Circuit and Reference cal indicates at the first step a difference in...

Hello the audio card is still undergoing circuit modification to improve some aspects related to the DAC low-pass filter and to improve the square waveform always output to the DAC. I am a perfectionist and I am never happy with the result, the next version will have a more complex output buffer...

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