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Subject: Ground loops?
Date: Fri, 13 Sep 2002 15:53:58 +0100
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Say I had three printed circuit boards. Each board requires a +5V supply and
ground, and in addition the boards are inter-connected via ribbon cables
using separate cables. Let's say the environment is a little noisy from an
electrical point of view, so the ribbon cables use the every second
conductor is grounded type construction.
First, what is the best way to connect power? My instinctive reation to this
is star ground where each card's ground goes to a common point. Similarly
for the +5V.
Second, should the grounds on the ribbon cable connectors be grounded on
both ends? Again my reaction is grounding at both ends creates ground loops
that could pick up noise from the environment. My feeling is that only one
end of the connectors chould be grounded and the other ends left floating.
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