On Wed, 11 Oct 2006 00:38:03 -0500, "Ken Maltby"
wrote:


You know how an IC gives off heat in relation to how
hard it is working, ("constant current" is a myth) heat is
only one part of the electromagnetic spectrum.

No, constant current is a fact. The IC draws constant
current in many MP3 players and does not substantially
change it's heat output unless entirely turned off or put to
sleep which is an entirely separate mode of player
operation, not momentary in use like with a CPU.


Switching
devices certainly produce as much "noise" when they
operate as analog devices, more in most cases.

We may have a mic on shielded cable running to a constant
current chip that digitizes. It's spitting out digits when
there's no noise as well as when there is. Yes there may be
noise, but it may not vary as with the old analog, and
certainly not as noisey as something more obvious- a
transmitter signal.

We have
devices that can detect very, very low wattage signals.

That may be useful if you have an object in your hand, but
remember the unknown context of this thread, and that they
can't be constantly false detecting cell phones, beepers,
etc, providing the cell phone isn't recording off-grid which
is a whole 'nuther issue.