Studio Technologies 212 2013 - Manual (Page 9)

Model 212 User Guide Issue 5, May 2013
Studio Technologies, Inc. Page 9
Headphone Output
Two rotary controls are provided for
user adjustment of the headphone output
levels. For application flexibility the actual
function of the two “pots” is configurable.
For traditional on-air sports applications
they can be selected to the dual-channel
(“level/level”) mode which provides
independent control of the left- and right-
channel volume. For use with dual-
channel cue signals, or to support user
preference, the stereo (“level/balance”)
mode can be selected. In this mode one
control adjusts the overall level of both
the left and right channels, while the other
allows adjustment of the left/right level
balance. To help minimize the chance of
broadcast cues being missed, both level
control modes can be configured so that a
minimum headphone output level is main-
tained. Alternately, the headphone output
can be set to fully mute when the controls
are at their minimum position. The rotary
controls can also be set for a reverse
left/right mode. This is provided for cases
where a user needs to wear their headset
“reversed” to support alternate camera
angles. By using this special mode intui-
tive operation will be maintained and a
comfortable work environment assured.
Provision has been made to support ap-
plications where a monaural cue feed is
desired. A configuration switch allows the
summing (combining) of the selected left
and right headphone sources. In addition
to creating a dual-channel mono output it
also allows the level controls to be config-
ured as a simple 2-channel mixer.
The stereo headphone output was de-
signed to meet the needs of contemporary
headphones and headsets. Specifically,
the output circuits act as voltage, rather
than power, drivers. In this configuration
they can provide high output levels with
very low distortion and noise, along with
minimal current consumption. The out-
put circuits are configured to safely drive
stereo or mono loads. This ensures that
all types of headphones, headsets, and
earpieces can be directly connected.
Audio Quality and Protection
The Model 212’s circuitry was carefully
tailored to provide excellent audio perfor-
mance. Professional-quality components
are featured throughout. For reliability all
audio routing is performed using solid-
state devices. In all critical audio paths,
“clickless” performance is provided. All
audio inputs and outputs make extensive
use of protection components. This lim-
its the chance of damage from ESD and
other undesirable, yet real-world, hazards.
Power Sources
The Model 212 requires an external
source of nominal 24 volt DC, 150 milliam-
peres maximum, for operation. Inside the
Model 212, an internal switch-mode power
supply creates the various voltage “rails”
required by the internal circuitry.
An external power supply is included with
each unit. As an alternative, the Model 44
Interface can be used to power the Model
212. Available from Studio Technologies,
it serves as an interconnection “hub,”
providing power and signal routing for up
to six Model 212 Announcer’s Consoles.
Refer to the Technical Notes section for
details.
Relay Contacts
Model 212 resources include a general-
purpose relay, allowing specialized config-
urations to be created using its two form-C