Honored Contributor
Honored Contributorsource -> analog amp -> line in of DE2 , formerly calibrated to 0dBfs
line in -> audio codec -> codec interface core (operncores) -> obtain input data input -> true RMS- meassuring -> sampler -> hold circuit - > monitoring so you will have to implement a codec interface, the RMS-circiut, the sampler (most probably a FIR type with 10ms) and the hold circiut for monitoring for eye observation, last but not least monitoring can be done with a VGA core instead of LED bars. my 1920x1024 screen at the bottom of the page: http://www.96khz.org/htm/cyclone3platform.htm It can do both volume monitoring of the master, the group channels and
