don at till.com
Mon Aug 12 18:52:41 CEST 1996
Date: Fri, 09 Aug 96 15:59:54 PDT
From: gstopp at fibermux.com
Within a self-contained system such as a synthesizer I always just
ground everything together - the circuit board ground, the panel, the
jacks, the box, and the third prong of the AC power cord. Works fine
for me so far. I think that you only run into ground loop problems
when interconnecting machines together whose AC power comes from
different and/or distant outlets.
Yeah, but in practice something you are somehow connected to is always
powered by a different outlet (the outlet doesn't have to be very
distant either!). A typical example would be running a feed out to
the PA; ground loop city.
The recommended approach is to ground the chassis to the third prong
of the line cord (for shielding and safety), and connect *that* point
to signal ground and power supply ground (the star ground point)
through a low value resistor, say half-a-dozen ohms. For your phone
jacks, insulate them from the chassis and connect their ground
terminal to signal ground.
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