MCM Electronics

Voltage Controlled Amplifier By Radio Design Labs (ST-VCA3) MCM Part #555-18920

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Voltage Controlled Amplifier

The ST-VCA3 is used in applications requiring smooth audio level control from a remote control panel, potentiometer or dc voltage (0 to 10 V).

Specifications Top

Installation in series with the audio input of a power amplifier allows remote control of that amplifier's level. For installations where it is preferred to keep the audio localized in the rack, audio controls are extended outside the rack from the ST-VCA3. Many installations benefit from avoiding long-term potentiometer wear from audio running through the potentiometer. An ST-VCA3 with external dc control provides virtual immunity from scratchy audio. Audio/video system control units often provide 0 to 10 Vdc control outputs that can directly control audio levels using an ST-VCA3. The ST-VCA3 is primarily intended for line-level attenuation; a high quality utility microphone preamplifier is included in the module. If remote control of a microphone preamplifier is desired, such as a wall mounted level control for a microphone jack, the ST-VCA3 may serve as a remote controlled microphone preamplifier.


Features:
  • Audio Level Control from a DC Voltage
  • Audio Level Remote Control
  • Two Wire with Shield or Three Wire Control
  • VCA with Microphone or Line Level Input
  • VCA with Line-Level Output
  • VCA with LED Metering of Operating Level

Specifications:
Inputs (2): Mic: 200 O balanced; 5 kO unbalanced
Line: 30 kO bal. bridging or unbalanced
Input Levels (for +4 dBu output):
- Mic: -44 dBu to -60 dBu (150 O source)
- Line: -18 dBu (-20 dBV) to +4 dBu
Output Signal (normal rated): +4 dBu, 150 O balanced
Headroom: 18 dB
THD+N:
. Mic: < 0.05%; Line: <0.025% (unity gain);
. 0.025% typical at 15 dB attenuation
Frequency Response:
- Mic: 30 Hz to 20 kHz (±1 dB)
- Line: 10 Hz to 20 kHz (±0.1 dB)
Noise:
- Mic: < -71 dB below +4 dBu output (150 O source; 50 dB gain)
- Line: <-78 dB below +4 dBu output (maximum gain)
CMRR: Mic: > 60 dB; Line: > 60 dB, (50 Hz to 120 Hz)
Control Input: 0 to 10 Vdc or 0 to 10 kO Linear
Attenuation Range: 0 to 90 dB (>90 dB at 0 Vdc control)
Power Requirement: GROUND-REFERENCED, 24 Vdc @ 50 mA
Dimensions:
. Height: 0.7 in. (1.7 cm),
. Width: 3 in. (7.6 cm),
. Depth: 1.6 in. (3.9 cm)

Part Numbers
MCM Part #:555-18920
Radio Design Labs Part #:ST-VCA3
Package Specifications & Dimensions
Weight:0.1 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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