MCM Electronics

Line Level Gain Control Amplifier By Radio Design Labs (ST-GCA3) MCM Part #555-18882

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Gain Control Amplifier - Line Level

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.

Specifications Top

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.


Features:
  • 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

Specifications:
Input:
. +4 dBu balanced (nominal);
. -45 dBu to +20 dBu for rated output
Maximum Input Level: +26 dBu
Outputs (2):
. +4 dBu, 150 O balanced LINE (nominal, +0/-3 dB);
. -45 dBu balanced MIC into 150 O
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 vailable expansion and gain reduction).
Power Requirement: GROUND-REFERENCED or FLOATING, 24 Vdc @ 40 mA
Ambient Operating Environment: 0° C to 55° C

Part Numbers
MCM Part #:555-18882
Radio Design Labs Part #:ST-GCA3
Package Specifications & Dimensions
Weight:0.125 lbs.
Hazardous:No
RoHS Comp:Yes
Warranty:1095 days
Need to Return?
Length:4 in.
Width:2 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

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