Studio Technologies 210 2008 - Manual (Page 13)

Model 210 User Guide Issue 4, October 2008
Studio Technologies, Inc. Page 13
While the Model 210’s IFB input was
designed for connection to a “wet” IFB
circuit, it’s also possible to connect line-
level audio sources. Please refer to the
Technical Notes section of this user guide
for details.
External Power Input
An external source of 24 volt DC power
can be connected to the Model 210 by
way of a 2.1 x 5.5 mm coaxial power jack
which is located on the back panel of the
unit. The center pin of the jack is the posi-
tive (+) connection. While the requirement
for the external source is nominally 24
volts, correct operation will take place
over a 20 to 30 volt range. The Model 210
requires 70 milliamperes at 24 volts DC
for correct operation. Included with each
Model 210 is a 24 volt DC external power
supply. The power supply’s DC output
cable has been terminated with a Switch-
craft® S760K coaxial power plug. This
“locking” type of plug correctly mates
with the Model 210’s 24 Vdc input jack.
The locking feature is important, allowing
the external power source to be securely
attached to the Model 210.
As previously discussed in this user guide,
an IFB circuit connected to the IFB in-
put can serve as the Model 210’s power
source. Alternately, an external 24 volt
DC source can be connected. For redun-
dancy, both the IFB circuit and the exter-
nal source can be connected at the same
time. If one or the other becomes inopera-
tive, the remaining source will provide all
Model 210 power.
Note that if both an IFB circuit and an
external 24 volt DC source are connected,
power will be drawn only from the exter-
nal source. This minimizes the chance
that lengthy cable runs or other IFB circuit
issues will impact Model 210 operation.
Whichever device is providing power,
audio signals from the IFB circuit can still
serve as the audio sources for the head-
phone output.
Pushbutton Labeling
The two pushbutton switches used in
the Model 210 were selected for several
reasons. Foremost was the fact that they
are highly reliable, using gold-plated con-
tacts for long life in less-than-ideal environ-
ments. A second reason was that applying
customized labels to the button caps
would be very simple. The labels, text
printed on clear material, are placed under
the clear caps on the top of the buttons.
From the factory the left button is labeled
COUGH and the right button is labeled
TALKBACK. This was selected to be
appropriate for many on-air applications
in English-speaking locations. But it’s
expected that these may need to be
changed to meet the needs of specific
applications.
As a “head start” for some applications,
a clear sheet with a number of commonly
used button designations printed on it
is included in the shipping carton. These
were created at the factory using a stan-
dard personal computer graphics program
and laser printed onto 3M CG3300 trans-
parency film. The desired button labels
can be cut out with a pair of scissors, fol-
lowing the printed guide lines that indicate
the required size.
The clear lens on top of each button cap
can be removed with a fingernail or small
screwdriver. Be certain not to scratch the
button if a screwdriver or other small tool
is used. The clear label can be removed
and replaced. The button cap is then