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Subject: Re: Audio noise in diff amps
Date: 20 Dec 2002 12:31:32 GMT
References: <firstname.lastname@example.org> <7a9M9.6086$jM5.email@example.com>
User-Agent: tin/1.4.5-20010409 ("One More Nightmare") (UNIX) (CYGWIN_NT-4.0/1.3.12(0.54/3/2) (i686))
Phil Allison wrote:
> "Rick" wrote in message
>> You weren't being abused by fools.
> ** Yep, I was actually. Now **you** add to the list.
Perhaps you could point to ANYTHING I've said that's technically wrong
or even ambiguous as proof of my foolishness. I'm not the muppet insisting
that noise is some sort of special voltage that doesn't deliver power into
a load in order to preserve the laws of thermodynamics. I'm not
the one quoting a VOLTAGE as, variously, uV, dBm, dB and dBu.
>> You made an invalid assumption that
>> everyone on this group is an audio engineer who misuses the term "dBm"
>> in the same manner as you.
> ** What absolute bullshit. How the hell do you reach an idiot
> conclusion like that ??
From the fact that everyone is talking across eachother because of your
use of audio engineering's ambiguous, and apparently obsolete, use of dBm.
> I made *no error whatever* and my correct explanation was ignored.
You wouldn't have NEEDED to explain yourself if you'd bothered to mention a
few salient facts in the first place. You didn't originally mention the
bandwidth or the formula you'd used to come up with 2.4uV. I knew what
you were on about, but it's evident that others didn't. You then went
and quoted that voltage in dBm - utterly vague, particularly when the
reference impendace is arbitrary...not everyone in engineering uses 600 Ohms.
You then invented a new Physics, whereby power sources don't dissipate into
resistive loads. That's not what I'd call "no error whatsoever" - that's
as wrong as can be.
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