Studio Technologies 220 2008 - Manual (Page 34)

Issue 4, October 2008 Model 220 User Guide
Page 34 Studio Technologies, Inc.
level is –10 dBu, the same as with an IFB
circuit. This may require that an external
attenuator (“pad”) be used to reduce
the level of the connected signal. As
expected, powering the Model 220 in
this scenario will require an external
source of 24 volt DC to be connected.
Additional Connectors
Three spare connector locations are
provided on the Model 220’s back panel.
From the factory they contain blank
plates that can be readily removed and
replaced with a variety of XLR-type con-
nectors. These spare connector locations
are specifically included so that a Model
220 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 outputs
or IFB input connections.
The spare connector locations are com-
patible 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 220’s back panel is also intended
to secure the replacement connectors.
If connectors are added to the Model
220’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 220. The Brother label cassette
number TX-3151, white on black, is appro-
priate 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 220’s printed-circuit-board-
mounted input and output connectors. This
was accomplished by including numerous
3-position male “header” connectors on
the Model 220’s circuit board. These head-
ers, on 0.1-inch centers, are wired in paral-
lel with the Model 220’s connectors. This
“no solder” solution makes customizing
a Model 220 a simple process. The head-
ers, located on the Model 220’s printed
circuit board, are Molex® part number
22-23-2031. They mate with Molex housing
number 22-01-3037. To make the inter-
connection, separate crimp terminals
are attached to loose wires and then
“snapped” into the housing. Molex part
number 08-50-0114 specifies crimp ter-
minals that are appropriate for wires of
22 to 30 gauge. These parts are available
worldwide from sources such as Digi-Key,
website www.digikey.com.
To make the process of connecting to
the Model 220’s headers a simple task
an interface cable kit, part number 31087,
is available from Studio Technologies.
Each kit includes five cable assemblies
and a length of heat-shrinkable tubing.
Each cable assembly consists of a mat-
ing connector with three color-coded wires
attached. These wires, nominally 12 inches
in length, allow convenient soldering to a
connector slated to be installed in a spare
location on the Model 220’s back panel.
For reference, the wire color for pin 1 is
gray, pin 2 is yellow, and pin 3 is blue.