RDL STA2A Data Sheet
STICK-ON® SERIES
Model STA-2A
Dual High Gain Line Amplifiers
ANYWHERE YOU NEED...
Up to 24 dB Gain in One or Two Audio Lines
•
Conversion from Unbalanced to Balanced
•
Conversion from High to Low Impedance
•
Low Impedance, High Current Line Drivers
•
A Two-Channel Line-Level Preamplifier
•
High Gain, High Output, High Performance
•
Ground-Referenced or Floating Power
•
You Need The STA-2A!
The STA-2A is part of the group of versatile STICK-ON products from Radio Design Labs, featuring the
advanced circuitry for which RDL products are known. The durable adhesives provided with the STA-2A
permit permanent or detachable mounting. Numerous mounting accessories, brackets and rack-mount
chassis are optionally available to facilitate any system design.
APPLICATION: The STA-2A is a two-channel, line-level audio preamplifier. Each channel is identical.
The audio inputs are bridged at 20 kΩ and accept either an unbalanced or a balanced audio signal. Gain
is adjustable from unity gain to +24 dB using a 25-turn precision audio taper trimming potentiometer. The
output line driver circuits are designed to drive long balanced audio lines into 600 Ω loads or bridging
loads. The STA-2A features wideband circuitry for excellent phase response, low noise, low distortion and
exceptional audio clarity.
The power supply input may be fed from a floating (not ground-referenced) 24 Vdc power source, from a
bipolar power supply (+/-12 Vdc or +/-15 Vdc) or from a ground-referenced 24 Vdc power supply.
Many audio products provide optimum performance when feeding into a bridging input, but may not
provide the output needed to directly drive low-impedance lines which may be terminated with 600 Ω
transformers. The STA-2A is specifically designed for such installations, and is also ideal in installations
requiring high gain in line-level audio transmission.
Both the input and output circuits function as electronic transformers, permitting either balanced or
unbalanced audio connections. The STA-2A may be used as a balanced input/balanced high-level output,
two-channel (stereo) preamplifier, or may be used to convert unbalanced sources to 600 Ω balanced lines.
In installations where high gain may be required and balanced signals must drive terminated 600 Ω lines,
the STA-2A is the ultimate choice. The STA-2A offers the unparalleled longevity and audio clarity for
which RDL products are known. Used in conjunction with other RDL RACK-UP
FLAT-PAK™ series products, the STA-2A can be the foundation for many high quality, innovative audio
systems!
®
, STICK-ON, TX™, or
RDL • P.O. Box 1286 • Carpinteria, CA., USA 93014 • (805) 684-5415 • FAX (805) 684-9316 • http://www.rdlnet.com
STICK-ON® SERIES
Model STA-2A
Dual High Gain Line Amplifiers
DUAL HIGH GAIN LINE AMPS
G
A
I
INPUT
N
A
SIGNAL
FROM
BALANCED
LINE-LEVEL
SOURCE
BALANCED OR UNBALANCED
A
OUTPUT
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
INPUT
DUAL HIGH GAIN LINE AMPS
G
A
I
INPUT
N
A
BALANCED OR UNBALANCED
A
OUTPUT
INPUT
OPTIONAL
(WHEN USING GROUND-REFERENCED POWER SUPPLY)
JUMPER
RDL PS-24
TYPE
SUPPLY
TYPICAL PERFORMANCE
Amps per STA-2A:
2 identical circuits (stereo or dual mono)
Inputs (2): 20 kΩ balanced or unbalanced
Input Signal:
-20 dBu (-18 dBV) to +18 dBu (+4 dBu out)
Maximum Input Level: +24 dBu
Outputs (2): 150 Ω balanced or 75 Ω unbalanced
Output Signal:
Balanced: +4 dBu nominal
Unbalanced: 6 dB below balanced line level
Maximum Output Level: +25 dBu
Frequency Response: 10 Hz to 100 kHz (+/- 0.05 dB)
THD+N: < 0.004% (unity gain)
891-1100
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
HIGH OR LOW Z
B
CHANNEL B
CONNECTIONS
IDENTICAL TO
CHANNEL A
B
OUTPUT
HIGH OR LOW Z
OUTPUT
24 VDC
PWR
U
24 VDC
PWR
24 Vdc
POWER
SOURCE
Radio Design Labs Technical Support Centers
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
AUDIO
WIRING
G
A
I
N
B
25 TURN
GAIN SET
ADJUSTMENT
SUPPLY
WIRING
G
A
I
N
B
FOR FLOATING
OR BIPOLAR
INSTALLATION
FOR GROUND-
REFERENCED
INSTALLATION
DO NOT
GROUND
NEGATIVE
POWER
OR
GROUND
NEGATIVE
POWER
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.
DUAL HIGH GAIN LINE AMPS
G
A
I
INPUTAOUTPUT
N
A
SIGNAL
FROM
UNBALANCED
LINE-LEVEL
SOURCE
BALANCED OR UNBALANCED
INPUT
SIGNAL
FEEDING
UNBALANCED
LINE-LEVEL
EQUIPMENT
DUAL HIGH GAIN LINE AMPS
G
A
I
INPUT
N
A
BALANCED OR UNBALANCED
A
OUTPUT
INPUT
AUXILIARY
BIPOLAR
SUPPLY
IMD: < 0.005% (unity gain)
Noise below +4 dBu: < -90 dB (unity gain)
Headroom: > 20 dB (above +4 dBu)
Gain: Unity +24 / -14 dB (adjustable)
CMRR: > 60 dB (50 Hz to 120 Hz)
Power Requirement: 24 to 33 Vdc @ 50 mA,
Ground-referenced or Floating
Dimensions: Width: 3.00 in. 7.62 cm
Depth: 1.55 in. 3.94 cm
Height: 0.65 in. 1.65cm
HIGH OR LOW Z
B
OUTPUT
CHANNEL B
CONNECTIONS
IDENTICAL TO
CHANNEL A
HIGH OR LOW Z
B
OUTPUT
G
OR
N
D
Vdc
BIPOLAR SUPPLY
24 VDC
PWR
24 VDC
PWR
12
15
G
A
I
N
B
U
G
A
I
N
B
UU
12
OR
15
Vdc
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