AW: To earth, or not to earth...
magnus at analogue.org
Wed Dec 3 10:51:22 CET 1997
>>>>> "PP" == Paul Perry <pfperry at melbpc.org.au> writes:
PP> This balanced/unbaslanced thing might be a bit Quixotic...
PP> after all, there is a hell of a lot of modular stuff out there
PP> produced over the years and I havn't noticed any of it suffering
PP> from hum pickup or crosstalk to any degree (OK the switch matrix
PP> on the ARP2500 does, but that is a different thing). Most of this
PP> gear has suffers more from IC noise in my experience...
PP> Which makes me think that just using commercially tried construction
PP> methods and layout might be all that is needed, or worth doing.
Not too uncommon is that the cursuit surrounding an op-amp (or
transistor for that matter) is not even closely addapted to create
lowest over all noise from the cursuit. How common isn't it to see
just a lot of 1k and 10k resistors sitting there?
Many designers still have to learn from the EMC people. Sitting down
with a near-field probe makes you think on how you design stuff.
Where things comes out it also comes in...
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