Precision Audio and AV Interface Products

Radio Design Labs

ST-GCA3 Gain Control Amplifier - Line Level

  • Automatic Gain Control
  • Wide Dynamic Range AGC
  • Slow Inaudible Gain-Reduction
  • Tight Dynamic Control
  • Positive, Fast Gain Reduction
  • Low-Noise and Low-Distortion AGC
  • RDL® SupplyFlex™ Power Input Configuration
  • Overview
  • Specifications
  • Related Products
  • Accessories
  • Downloads
  • How to Buy
  • Product Series
  • Dimensions

The ST-GCA3 constantly adjusts for changes in input levels, bringing up low levels, and reducing gain for high levels. The audio level is constantly adjusted to maintain the correct output. The AGC adjustment rate is switch-selectable. Making audio levels uniform and consistent improves the performance of nearly any type of audio system, and the ST-GCA3 SLOW mode is ideal for leveling music sources. The FAST setting of the ST-GCA3 makes it ideal for use in systems prone to loud bursts of audio, and inconsistent levels which must be constantly and quickly corrected. In paging systems, intercom systems, and mic mixing applications where intelligibility is a must the ST-GCA3 FAST mode can be the key to optimum performance.

Applications

Input:
+4 dBu balanced (nominal);
-45 dBu to +20 dBu for rated output
Maximum Input Level:
+26 dBu
Outputs (2):
+4 dBu, 150 Ω balanced LINE (nominal, +0/-3 dB);
-45 dBu balanced MIC into 150 Ω
AGC Range:
> 40 dB (output level maintained within 3 dB)
Frequency Response:
10 Hz to 20 kHz (± 0.75 dB)
Noise:
No input signal, output un-muted: < -70 dB
No input signal, output muted: < -80 dB
Input signal present, output muted: < -50 dB
THD+N:
< 0.3% (50 Hz to 20 kHz; Typ. 0.05% @ 1 kHz)
Mute Threshold:
-46 dB below max input; -28 dB below normal input
Muting Response:
15 sec. for 50 dB
SLOW AGC response:
8 sec. for 20 dB average level adjustment
FAST AGC response:
3 sec. for 20 dB average level adjustment
On Delay:
50 ms to ramp from muted to fully on condition
Indicators (2):
LED, green variable intensity shows audio expansion
LED, yellow variable intensity shows audio gain reduction
Note: Both LEDs display equal intensity for normal input level (equal available expansion and gain reduction).
Ambient Operating Environment:
0° C to 55° C
Power Requirement:
GROUND-REFERENCED or FLOATING, 24 Vdc @ 40 mA
Dimensions:
Height: 0.7 in. (1.7 cm), Width: 3 in. (7.6 cm), Depth: 1.6 in. (3.9 cm)
Package Type:
Cardboard Box
Package Dimensions:
2 x 2 x 4 in.
Shipping Weight:
0.2 lbs.
WEEE weight:
0.145 lbs.
Tariff code:
8543.70.9860

Documents:
Format
PDF
CAD Files:
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Declaration of Conformity:
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A&E Specifications:
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STICK-ON SERIES

STICK-ONs are the original application-specific modules for the A/V, recording and broadcast industries. Module functions include signal detection, switching, pre-amplification, format conversion, line driving, power amplification, mixing, distribution, gain control, equalization, routing and more. Each STICK-ON is an ultra-compact module engineered to provide higher performance and longer life than other industry products. STICK-ON modules are solid encapsulated hybrid circuits in durable industrial black plastic enclosures (1.55", 3.94 cm x 3", 7.62 cm x 0.65", 1.65 cm) with clear bold white lettering for the terminal block connections, recessed trimming controls and switches.

Since RDL first originated application-specific modules, STICK-ONs have led the industry in economical, high-performance and cost-effective long life solutions in system designs. Multiple STICK-ON modules can be interconnected to form all or part of an A/V system. A single STICK-ON module may be mounted right where its function is needed, often to add an input, output, or gain adjustment to existing equipment. STICK-ON modules allow customizing an A/V system to precisely match users’ needs. Adding STICK-ONs to an existing system can extend system life by adding updated features, resulting in considerable cost savings. A complete range of backboard and rack mounting options is available for systems comprised of multiple STICK-ON modules.

The technology used in STICK-ON modules has been regularly updated over the years to insure industry-leading performance. Functions and features provided by STICK-ONs, since their introduction, are still available today. This continuity in product offering and support makes STICK-ON modules the preferred long-term resource for system design solutions. STICK-ON SERIES modules are designed and manufactured in the U.S.A.

ST-GCA3 ST-GCA3