Studio Technologies 230 2008 - Manual (Page 10)

Issue 7, October 2008 Model 230 User Guide
Page 10 Studio Technologies, Inc.
are featured throughout. For reliability all
audio routing is performed using solid-
state devices under microcontroller direc-
tion. In all critical audio paths, “clickless”
electronic switches provide noise-free
control. All audio inputs and outputs make
extensive use of protection components.
This limits the chance of damage from
ESD and other undesirable, yet real-world,
hazards.
Power Sources
The Model 230 can derive its operating
power from an IFB circuit, an intercom
line, or an external 24 volt DC source. For
redundancy, all three power sources can
be connected simultaneously. An internal
switch-mode power supply ensures that
all Model 230 features are available, in-
cluding phantom power, when the unit
is powered by any of the three sources.
The Model 230 is compatible with IFB
circuits provided by most standard broad-
cast systems. However, maximum perfor-
mance can often be obtained by using the
IFB interface devices available from Studio
Technologies. Single-channel and four-
channel units are available, each providing
high-quality audio along with an excel-
lent source of DC power. They’re directly
compatible with most matrix intercom sys-
tems, as well as standard line-level audio
signals. Refer to the Studio Technologies
website for details.
Auxiliary Relay
Model 230 resources include a general-
purpose relay, allowing specialized con-
figurations to be created. Under software
control, the relay can be configured to fol-
low the state of the main output, talkback
1, or talkback 2 buttons. Taking advantage
of the back-panel locations provided for
additional XLR-type connectors, a techni-
cian may easily implement a variety of
functions such as an “on-air” indicator or
performing loudspeaker muting during
talkback. Special configuration modes are
even included to allow direct control of the
relay using the talkback 1 or talkback 2
buttons without impacting any of the unit’s
audio signals.
Configuration
Model 230 configurations are made using
a number of DIP-type switches and four
trim potentiometers. One 8-position switch
array is used to set the gain of the micro-
phone preamplifier, the on/off status of
phantom power, and control of the head-
phone output modes. A 12-position switch
array configures which of the six cue
audio sources are routed to the head-
phone outputs. Two 8-position switch
arrays communicate the desired operat-
ing modes to the microprocessor. Two ro-
tary trim pots are used to adjust the input
sensitivity of the line inputs. Two additional
rotary trim pots are provided to adjust the
“sidetone” level for the intercom inter-
face’s talkback functions. All switches and
trim pots are accessible via the bottom of
the Model 230’s enclosure; the unit does
not have to be disassembled. Changes
made to any of the configuration parame-
ters become active immediately. To pre-
vent access to the configuration controls a
security panel, included with each unit, is
attached to the bottom of the enclosure.
Connectors
The Model 230 uses standard connectors
throughout. The microphone input, line
inputs, IFB input, and intercom interface
functions use 3-pin female XLR-type con-
nectors. The main output and line-level
talkback output functions use 3-pin male