On Wednesday 28 September 2011 10:51:23 am Rob Landry wrote: > When we looked at the cards closely, we found that the "balanced" > inputs were single opamps with (if I remember right) 10K ohms in series > with the inverting input and 10K ohms going to ground on the other side to > create something that measures balanced but has no common-mode rejection > at all.
Technically, that *is* balanced, but not the way we normally think. I have an article coming out in theBDR.net with some detailed explanation of how, and why. The simplest way to check for a differential input ( which is really what you want ) is to put a signal on either input line across to "ground," then the other. If it's really a differential input, the only difference should be the phase of the output signal. ( technically, all inputs are differential, but against what ? ) The single ended input is cheaper to build, and that's why you find them in non-pro equipment. -- Cowboy http://cowboy.cwf1.com Reality is for people who lack imagination. _______________________________________________ Rivendell-dev mailing list [email protected] http://lists.rivendellaudio.org/mailman/listinfo/rivendell-dev
