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K-Series Balanced Current Amplifier™
Fig. 4.2 Balanced Input Wiring
Hum and Buzz Tips
1. It is imperative that all of your electrical equipment share the
same power ground reference.
2. Unless you are interfacing to a microphone, the shield of the
cable should only be connected at one end. (See Fig. 4.2.)
3. Do not pass signal ground between electrical components in a grounded source
system
4. If you wish to avoid ground loops, it doesn’t matter if you lift the input or output
signal ground for your system topology, just be consistent. Personally I prefer to lift
the input signal ground and it has always been successful...so far!
5. NEVER use a ground lift adapter to lift the power ground on a 3-wire AC cord; this
is not its intended purpose. It is better to have it SAFE than SILENT!! Look for the
true source of the noise.
6. Even when interfacing to an unbalanced load, it is preferable to use two-conductor
shielded cable.
7. Get rid of the lighting company!
Check Figure 4.2 to see if your
cable has been wired with the
proper shield and ground connec-
tion. If the cabling is incorrect, you
may be able to avoid the ground
loop (and associated hum) by plug-
ging all of your equipment into the
same AC circuit (on the same
breaker). If this is impractical, you
will need to fix the cable to match
the appropriate illustration. Or you
may want to simply replace the of-
fending cable with a commercially
manufactured cable of the appro-
priate type.
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