Studio Technologies 220 2013 - Manual (Page 33)

Model 220 User Guide Issue 5, February 2013
Studio Technologies, Inc. Page 33
to connected devices such as the Model
220. However, unlike other products, the
power supplied by these units’ IFB circuits
maintain their output voltage all the way to
their full rated current. The result is being
able to power more devices over longer
cable runs. In addition, the audio quality of
these units is superior. For further informa-
tion please refer to the Studio Technolo-
gies website.
LED Colors
As previously described, two LED indica-
tors are associated with the main output
and are located directly above the main
output pushbutton switch. The red LED,
located on the left, is lit whenever the
main output is muted. The green LED,
located on the right, is lit whenever the
main output is active. The thought pro-
cess behind the color choices was that
red would relate to the main output being
muted (“stop”) while green would relate
to the main output being active (“go”). It’s
possible that these color choices may not
meet the needs of all users and applica-
tions. For example, it’s reported that one
European broadcaster typically uses these
two colors in the opposite fashion. Their
choice is to have the red LED lit whenever
the main output is active, warning the tal-
ent 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 LEDs associated with
the talkback buttons were selected to be
green. They light whenever their associ-
ated talkback functions are active. It’s pos-
sible that some applications may benefit
from revising these LED colors too. While
red is certainly one possible choice, other
colors are also a possibility, including
amber, orange, blue, or white—these
days there are lots of choices available.
A qualified technician can easily revise
the LED colors to meet an application’s
exact needs. The process would begin
by disassembling the Model 220’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 825 ohm 1206-size
surface-mount resistor is electrically in
series with each LED.
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
220 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 holding
one Model 220, its associated 24 volt DC
power supply, and documentation. Some
applications may benefit from selecting a
larger case that would also hold a related
headset, cables, etc. A larger case could
also be selected that would hold multiple
Model 220 units. Pelican sells their prod-
ucts through a dealer network, many of
which can be located via a web search.
Connecting Line-Level Audio
to the IFB Input
In “emergency” situations it’s possible to
connect line-level audio signals directly
to the Model 220’s IFB input connector.