RDL STGLA1 Data Sheet
STICK-ON® SERIES
Model ST-GLA1
Gated Line Amplifier
ANYWHERE YOU NEED...
• A Gated Line-level Preamplifier
• Self-Gating to Suppress Unwanted Noise
• Fast, Silent Audio Switching
• Integral Single-ended Noise Reduction
• Adjustable Gain and Threshold
• Balanced or Unbalanced Input / Output
• Open-Collector Logic Output
You Need The ST-GLA1!
The ST-GLA1 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable
adhesives provided with the ST-GLA1 permit permanent or removable mounting. Numerous available
mounting accessories, brackets and rack-mount chassis are optionally available to facilitate any system
design. The ST-GLA1 offers the ultimate in totally solid-state automatic line-level gating, with a big plus,
you can put it right where you need it!
APPLICATION: The ST-GLA1 is a self-gated line amplifier designed to be used in a variety of situations
where it is desired to produce an automatically switched line-level signal with integral noise reduction.
This module may be used in conjunction with other RDL modules to configure automatic mixing systems
or may be used alone as a noise gate. The open-collector output may be used to trigger other equipment
or RDL modules. The versatility of ST-GLA1 applications range from complete automatic mixing system
design to the addition of automatic gating to the inputs of conventional mixers or amplifiers to suppress
accumulated or induced system noise.
The input and output may be wired balanced or unbalanced. Two LED indicators are provided for
adjustment. One LED indicates the correct gain setting. The second indicator shows when the module is
switched ON. Gain and threshold levels are adjusted using multi-turn precision trimmers.
The input gain adjustment has sufficient range to accommodate unbalanced consumer or balanced
professional audio sources. The threshold adjustment permits setting the audio level at which the
preamplifier output turns ON. Internal switching is solid- state and uses a soft-switch transition that
sounds instantaneous without annoying clicks or edge transitions. When the audio drops below the
preset threshold level, the module mutes 2 seconds later. In circumstances where a longer delay time is
desired, an external capacitor may be connected to extend the delay.
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-GLA1
Gated Line Amplifier
AUDIO WIRING
INPUT
GND
SIGNAL
FROM
UNBALANCED
LINE-LEVEL
SOURCE
EXTERNAL INDICATORS
GATED LINE AMPLIFIER
L
E
INPUT
V
E
L
LINE LEVEL INPUT / OUTPUT
PWR
GND
OUTPUTDE
S
L
A
V
E
SIGNAL
FEEDING
UNBALANCED
LINE-LEVEL
EQUIPMENT
OUTPUT E
24V
S
L
DC
A
OUT
V
E
A
L
T
A
Y
E
D
L
A
Y
L
E
V
E
L
BALANCED
LINE-LEVEL
G
A
T
E
INPUT
SIGNAL
FROM
SOURCE
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.
GATED LINE AMPLIFIER
LINE LEVEL INPUT / OUTPUT
PWR
GND
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
L
E
V
E
L
OUTPUT E
24V
S
L
DC
A
OUT
V
E
POWER WIRING
INPUT
CAP DELAY
NONE 2 Sec
4.7uF 3 Sec
G
D
A
L
A
Y
T
E
22uF 6.5 Sec
10uF 4 Sec
47uF 11.5 Sec
100uF 22 Sec
220uF 60 Sec
OPTIONAL
CAPACITOR
GATED LINE AMPLIFIER
LINE LEVEL INPUT / OUTPUT
PWR
GND
OUTPUT E
24V
S
L
DC
A
OUT
V
E
G
D
A
L
T
A
Y
E
WDG-1 LED
CONNECTION
ADJUST LEVEL UNTIL
LED IS ON STEADY
DURING NORMAL
AUDIO
AND/OR USE AN LED
WITH CURRENT
4.7K
LIMITING RESISTOR
FOR REMOTE GATE
INDICATION
ADJUSTMENT
1
THRESHOLD LEDGAIN LED
24 VDC
POWER
SOURCE
2
THIS
TERMINAL
IS COMMON
GROUND
ADJUST GATE FOR
DESIRED THRESHOLD
SENSITIVITY (CW
INCREASES
THRESHOLD AND
TRIGGERS ON
HIGHER LEVELS)
TYPICAL PERFORMANCE
Input - 10 kΩ: Balanced or unbalanced, bridging
Input level: -15 dBv to +4 dBu
ON Gain: Adustable to produce +4 dBu
output for rated input signal range
Headroom: > 18 dB (above +4 dBu)
THD+N: < 0.200%
Freq. Response: 10 Hz to 30 kHz (+/- 0.25 dB)
Residual Noise: < -95 dB below +4 dBu (muted)
Output - 150 Ω; +4 dBu balanced,
-10 dBv unbalanced
891-1000G
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
Switching Time: 30 ms
Off delay: 2 seconds nominal (may be
extended using external capacitor)
Control Output: Open-collector @ 50 mA
Muting Attenuation: > 60 dB (referred to input level)
Muting Threshold: –16 dB to –35 dB
(adjustable, referred to +4 dBu)
Detector Bandwidth: 20 Hz to 5 kHz
Power: 24 to 33 Vdc @ 75 mA,
Ground-referenced
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