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| Re: Hitmen [message #56674 is a reply to message #56659] |
Sat, 06 August 2005 19:49  |
Perrin
Messages: 3
Registered: August 2005
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Junior Member |
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reduced 6dB
>
>Yes good point. I'll have to keep that in mind.
>
>Cheers,
>Kim.
Most engineers consider this AES article to represent the current standard
on this issue.
I recommend purchasing it from AES. Publications will be available at the
October show in NY.
I am lifting a small portion without permission:
[1] B. Whitlock, "Balanced Lines in Audio - Fact, Fiction, and
Transformers", Journal of the AES, Vol 43, No 6, June,
1995.
“Connecting a balanced output to an unbalanced input is much more problematic.
Balanced equipment uses a wide variety of output circuits. The type shown
in Figure 2A and Figure 2B can be damaged when one output is grounded. Others,
including most popular servo-balanced output stages, may become unstable
and oscillate or produce distortion unless one output is grounded right at
the driver. But such a ground, along with the existing one at the unbalanced
input, simply reduces the interface to a completely unbalanced one. Therefore,
all benefit of the balanced output is negated. That's why an external ground
isolator transformer, such as the one shown in Figure 2A, is a foolproof
method: It works with any kind of balanced or unbalanced output.”
____________________________________________
As pointed out, using a transformer is almost always considered the best
option, however like most people working in the real world, I have frequently
used the methods we are discussing. I have also seen opamps and power supplies
fried from inappropriate strapping to ground.
Gene
---=_linux4330d791
Content-Type: image/jpeg; name="2A.jpg"
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