Studio Technologies M212-00151 - Manual (Page 13)

Model 212 User Guide Issue 2, June 2006
Studio Technologies, Inc. Page 14
matrix intercom system. A single cable
is all that is required to interface an Artist
digital port with the Model 212.
Optional Analog Line Inputs
While the Model 212’s headphone sources
were designed primarily to be supplied
using one of the digital audio inputs, it’s
also possible to connect one or two ana-
log line-level audio sources. Please refer
to the Technical Notes section of this user
guide for details.
External Power Input
The Model 212 requires an external
source of 24 volt DC power for operation.
It is connected by way of a 2.1 x 5.0 mm
coaxial power jack which is located on
the back panel of the unit. The center pin
of the jack is the positive (+) connection.
While the requirement for the external
source is nominally 24 volts, correct
operation will take place with any source
within the range of 20 to 30 volts. A maxi-
mum current of 150 milliamperes at 24
volts DC is required. Included with each
Model 212 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 212’s 24 Vdc input jack.
The locking feature is important, allowing
the external power source to be securely
attached to the Model 212.
Pushbutton Labeling
The two pushbutton switches used in
the Model 212 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 applica-
tions 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
snapped back into the top of the button
housing using finger-pressure only. No
tool is required to replace the button cap.
If you need to make your own labels the
process is quite simple. Use a personal
computer to create the desired text. The
finished label size should be 0.625-inches
(15.8 mm) square. The completed artwork
can then be printed on transparency film
sheets using a laser or inkjet printer. These
sheets are readily available from most
office supply stores. A pair of scissors or
an X-ACTO® knife will complete the task.