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Ground Loop Isolation Transformers
for Professional Audio Applications |
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All transformers in the AGL series
are true isolation transformers, designed for low distortion, linear phase
response and excellent pulse fidelity. This is accomplished by extending
the bandwidth to over 300 KHz (10 - 15 times the normal 20 KHz bandwidth).
The extended bandwidth guarantees a linear phase response that provides
distortion-free audio with no loss of its original harmonic content. The
AGL-600 and AGL-600-2 includes aground lifter switch for the XLR
connectors. |
The AGL series of audio isolation
transformers was designed to solve the common audio problems of hum, buzz,
noise and unbalanced lines.
These problems usually exist at the output of an electronic device that is
connected to another electronic device in such a way as to create a ground
loop where common mode or EMI current can flow. See Figure #1 |
Audio Isolation Transformer
with
High Common Mode Rejection
Figure #4
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Figure #1
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Hum in audio or video systems is usually the
result of a ground loop in the system like the one shown in Figure #1.
Common mode current will flow in a ground loop created by an electrical
system that has grounds at different voltage potentials. The result is 60
Hertz hum in the power amp output.
Figure #2 |
Switch
Position
(1)
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Chassis shield
connected.
Audio ground not connected.
Acts as a balanced line transformer to break ground loops.
Eliminates hum and buzz. |
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Switch
Position
(2) |
Chassis shield and audio ground connected.
Corrects balance on audio lines. |
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Switch
Position
(3) |
Chassis shield and audio ground not connected.
Breaks ground loops.
Provides audio isolation. |
| In a multiple device system shown in Figure #2, it is very
important to determine which two pieces of equipment are the ones creating
the problem. The AGL-600 or AGL-600-2 can be inserted between them to
eliminate the hum. See Figure #3. |
The AGL-600 or
AGL-600-2 will stop hum, buzz and line balance problems. The 3-position
switch will eliminate the need to cut pin "1" to lift the audio ground and
the connection to the shield. |
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Figure #3 |
Figure #5
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| When the audio system is operating and hum exists,
disconnect one piece of the equipment at a time until the hum stops. Once
you find the combination of equipment that creates the hum, you can
install the AGL-600 or AGL-600-2 isolation transformer between them. |
For audio systems
using 1/4" mono jacks and plugs, use the AGL-10K (adaptors are available
to RCA and 3.5mm audio connectors). See Figure #5. |
