Studio Technologies 200 - Manual (Page 20)

Model 200 User Guide Issue 3, August 2004
Studio Technologies, Inc. Page 21
green would relate to the main output be-
ing active (“go”). It’s possible that these
color choices may not meet the needs of
all users and applications. For example,
it’s reported that one European broadcast-
er typically uses the colors in the opposite
fashion. Their choice is to have the red
LED lit whenever the main output is active,
warning the talent that they are “on-air.”
The green LED is lit whenever the main
output is muted, indicating to the talent
that it’s “safe” to say whatever they wish,
about whomever they wish to say it about!
For consistency, the LED associated with
the talkback button was selected to be
green. This lights whenever talkback is
active. It’s possible that some applications
may benefit from revising this LED color,
too. While red is certainly one possible
choice, other colors are also a possibility
including amber, orange, or blue—these
days there are lots of choices available.
The only limitation is the amount of current
available to light each LED. Using series
resistors of no less than 560 ohms will
ensure correct Model 200 operation.
A qualified technician can easily revise
the LED colors to meet an application’s
exact needs. The process would begin
by disassembling the Model 200’s enclo-
sure and detaching the pushbutton/LED
printed circuit board assembly. The LEDs
would then be unsoldered, removed, and
reinstalled (or replaced) in the desired
locations. To control the LED current and
set the brightness, a resistor is electrically
in series with each LED. An 820 ohm,
¼-watt resistor is associated with the red
LED while a 560 ohm, ¼-watt resistor is
associated with each green LED. These
resistors would also have to be unsolder-
ed, removed, and reinstalled. Then the
unit would be reassembled and tested
to confirm that the changes function as
desired. For additional information about
changing the LED colors, please contact
Studio Technologies’ technical support.
Travel Case
For portable applications it may be desir-
able to store and transport each Model
200 in a protective case. After much travel
with prototype announcer console units,
Studio Technologies’ personnel learned
to appreciate the Pelican Model 1450
case. Purchased with the foam interior
option, it does an excellent job of hold-
ing one Model 200, associated 24 volt DC
power supply, and related documentation.
Some applications may benefit from se-
lecting a larger case that would also hold
a related headset, cables, etc. A larger
case could also be selected that would
hold multiple Model 200 units. Pelican
sells their products through a dealer net-
work, many of which can be located via a
web search.
Connecting Line-Level Inputs
The Model 200’s IFB input was designed
to work with “wet” broadcast IFB circuits.
However, there may be applications where
it would be helpful to be able to connect
standard line-level audio sources. If it’s
anticipated that line-level audio sources
will frequently need to be connected to
the Model 200, one or two line input cards
can be installed. These cards, available
from Studio Technologies and purchased
separately (part number 31084), are
mounted into spare connector locations
that are provided on the Model 200’s back
panel. The line input card contains passive
circuitry, including a 3-pin female XLR-
type connector and a 10 k ohm to 10 k
ohm isolation transformer. Once installed,