STICK-ON® SERIES
Model ST-RX2
Solid-State Audio Router
ANYWHERE YOU NEED...
• To Route a Line-Level Source
• Audio Switched to One of Two
Destinations
• Silent Audio Switching
• Balanced or Unbalanced Routing
• Switching by Open-Collector Logic
You Need The ST-RX2!
The ST-RX2 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable
bottom adhesive permits quick, permanent or removable mounting nearly anywhere or it may be used with
RDL’s racking accessories. The ST-RX2 offers the ultimate in totally solid state audio switching, with a
big plus, you can put it right where you need it!
APPLICATION: The ST-RX2 has a single line-level audio input and two line-level audio outputs. In the
absence of a control input, the NORMAL module output is fed from the audio input. When the TRIG
control terminal is connected to ground, the input audio is fed to the SELECT output and the NORMAL
output is switched off. When the TRIG terminal is again disconnected from ground, then the SELECT
output is turned off and the NORMAL output is fed from the input. The module contains no relays or other
mechanical devices. The control circuits utilize solid-state switching to route the input signal to one of the
balanced output line drivers with off attenuation better than 80 dB at all audio frequencies!
The ST-RX2 has user-selectable switching rates. The module can be used in muting applications where
audio must be switched off extremely fast. This could be required to prevent feedback in automatic
microphone mixing installations. For muting, the audio output is connected to the NORMAL output, and
the ST-RX2 is used to turn this line off. In this mode, the audio turn-off time switching is accomplished in
less than 100 µs. Although necessary in some circumstances, this fast switching transition can sound
harsh to the ear and would be undesirable where the module is being used to select inputs to a high
power amplifier or in high quality studio applications. Installation of a jumper between the SOFT terminal
and GROUND slows the switching transition by implementing a soft knee, ramping the audio to the ON or
OFF condition. This still sounds instant to the ear, but is slowed sufficiently to remove any unpleasant
edge from the switch transition. For most applications, the module is used in the SOFT mode.
The control current required at the TRIG terminal is so minimal (< 0.5 mA) that the ST-RX2 can be
controlled from nearly any source from switches to logic circuits. The TRIG input feeds a comparitor,
which switches at a threshold of 2 volts, permitting open-collector switching, or switching directly from
circuits operating from a 5 Vdc supply. The exceptional low noise and low distortion performance of the
ST-RX2 makes it the ideal choice for noiseless line-level audio switching in both sound system or
recording installations. Used in conjunction with other RDL audio and control modules, the ST-RX2 can
be the foundation for many high quality, innovative audio systems!
Wherever a solid-state audio router is needed, the ST-RX2 is the ideal choice. Use the ST-RX2
combined with other RDL RACK-UP®, STICK-ON, TX™, or FLAT-PAK™ series products as part of a
complete audio/video system.
RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• (805) 684-5415 •• FAX (805) 684-9316 •• http://www.rdlnet.com
STICK-ON® SERIES
Model ST-RX2
Solid-State Audio Router
AUDIO ROUTING SWITCH
LINE LEVEL AUDIO SWITCH
T
INPUT
SIGNAL
FROM
BALANCED
LINE-LEVEL
SOURCE
INPUT
SELECTED
OUTPUT
SELECTED
OUTPUT
S
R
O
F
I
G
T
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
POWER
NORMAL
OUTPUT
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
AUDIO ROUTING SWITCH
LINE LEVEL AUDIO SWITCH
T
S
POWER
R
O
F
I
G
T
NORMAL
OUTPUT
AUDIO
WIRING
SELECTED OUTPUT WHEN
UNIT IS TRIGGERED
Installation/Operation
EN55103-1 E1-E5; EN55103-2 E1-E4
Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.
AUDIO ROUTING SWITCH
LINE LEVEL AUDIO SWITCH
T
INPUT
SIGNAL
FROM
UNBAL
LINE-LEVEL
SOURCE
SELECTED
OUTPUT
SIGNAL
FEEDING
UNBAL
LINE-LEVEL
EQUIPMENT
S
POWER
R
O
F
I
G
T
NORMAL
OUTPUT
SIGNAL
FEEDING
UNBALANCED
LINE-LEVEL
EQUIPMENT
AUDIO ROUTING SWITCH
LINE LEVEL AUDIO SWITCH
T
INPUT
SELECTED
OUTPUT
S
POWER
R
O
F
I
G
T
NORMAL
OUTPUT
OPEN
COLLECTOR
OR
MANUAL
OPTIONAL
SOFT
SWITCHING
SUPPLY
WIRING
ACTUATION
TYPICAL PERFORMANCE
Switching Time: Fast Soft
Time required for Normal output to turn off: 10 µs 5 ms
Time required for Normal output to turn on: 15 µs 70 ms
Time required for Select output to turn off: 15 µs 10 ms
Time required for Select output to turn on: 20 µs 35 ms
Control Signal: TRIG terminal must be externally connected to ground.
Control Current: 0.5 mA
Headroom: > 18 dB above +4 dBu
THD: < 0.030% @ 1 kHz
CMRR: > 45 dB (either input, 100 Hz)
Freq. Response: 15 Hz to 20 kHz (+/- 0.5 dB, into 10 kΩ bridging input)
30 Hz to 20 kHz (+/- 0.5 dB, into 600 Ω)
Noise: < -85 dB below +4 dBu unweighted, (-90 dB typ.)
ON Gain: Unity (balanced input/output)
OFF Attenuation: > 80 dB (either output), 95dB@ 1kHz
Power: 24 to 33 Vdc @ 40 mA, Ground-referenced
Dimensions: Height: 1.55 in. 3.94 cm
Width: 3.00 in. 7.62 cm
Depth: 0.65 in. 1.65 cm
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
891-1016H
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
24 VDC RDL PS-24
POWER
SOURCE
TYPE
SUPPLY
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