Studio Technologies 200 - Manual (Page 22)

Model 200 User Guide Issue 3, August 2004
Studio Technologies, Inc. Page 23
several limitations are taken into account.
The first limitation is that the 10 k ohm
input circuit presents an unbalanced load
to the source. In most cases this shouldn’t
pose a problem. If a balanced intercon-
nection scheme must be maintained
in-line isolation transformers can be used.
A second limitation is that the audio level
presented must not exceed 0 dBu or sig-
nal “clipping” may occur. Prepare a 3-pin
male XLR-type connector so that the line-
level audio source designated as channel
1 (left headphone output) is connected
with signal high on pin 2 and low/shield on
pin 1. The audio source designated as
channel 2 (right headphone output)
should be connected with signal high
on pin 3 and low/shield on pin 1. With
this connection scheme the nominal input
level is –10 dBu, the same as with an IFB
circuit. As expected, powering the Model
200 requires an external source of 24 volt
DC to be connected.
Additional Connectors
Two spare connector locations are provid-
ed on the Model 200’s back panel. From
the factory they contain blank plates that
can be readily removed and replaced with
a variety of XLR-type connectors. These
spare connector locations are specifi-
cally included so that a Model 200 can
be customized to meet the many specific
needs that arise in broadcast and related
audio applications. Expected uses for
these locations include adding a 5-, 6-, or
7-pin XLR-type connector to allow direct
connection of a broadcast headset. Other
uses include creating “loop through” or
“mult” functions for the talkback output or
IFB input connections. In addition, Studio
Technologies offers an optional line input
card that mounts directly in a spare
connector location. This was previously
described in this user guide.
The spare connector locations are
compatible with the Neutrik DL-series
of connectors. For flexibility, versions are
available that provide from three to seven
contacts. For example, a compatible 3-pin
female connector would be Neutrik part
number NC3FD-L-1. To support headsets
the NC6FDS-L-1 is often used. This is a
6-pin female connector with the unique
Switchcraft 6-pin arrangement. The hard-
ware that secures the blank plates to the
Model 200’s back panel is also intended
to secure the replacement connectors.
If connectors are added to the Model
200’s spare connector locations adding
labels to those connectors can be helpful.
For a great look it is recommended that
Brother® P-Touch ¼-inch (6 mm) labels
be created. Tape material that prints white
text on a black background works out
well for the Model 200. The Brother label
cassette number TX-3151, white on black,
is appropriate for use with many of their
printers.
In addition to the spare connector loca-
tions on the back panel, provision has
been made to allow easy interconnection
with the Model 200’s printed-circuit-board-
mounted input and output connectors.
This was accomplished by including
numerous 3-position male “header” con-
nectors on the Model 200’s circuit board.
These headers, on 0.1-inch centers, are
wired in parallel with the Model 200’s con-
nectors. This “no solder” solution makes
customizing a Model 200 a simple pro-
cess. The headers, located on the Model
200’s printed circuit board, are Molex®
part number 22-23-2031. They mate with
Molex housing number 22-01-3037. To