Product Description
RDL ST-VCA3 Voltage Controlled Amplifier
Overview
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). 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.
Power Supply Not Included
Recommended Power Supply:
- PS-24AS (USA)
- PS-24AX (International)
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
Construction | Plastic, metal |
Finish | Black |
Inputs | Inputs: x2 Mic: 200Ω balanced; 5KΩ unbalanced Line: 30KΩ balanced bridging or unbalanced Input levels: Mic: -44dBu to -60dBu (150Ω source) Line: -18dBu (-20dBV) to +4dBu |
Outputs | x1 +4dBu, 150Ω balanced |
Headroom | 18dB |
THD & Noise | Mic: < 0.05% Line: <0.025% (unity gain); 0.025% typical at 15dB attenuation |
Frequency Response | Mic: 30Hz to 20kHz (±1dB) Line: 10Hz to 20kHz (±0.1dB) |
Noise | Mic: < -71dB below +4dBu output, 150Ω source; 50dB gain) Line: <-78dB below +4dBu output |
CMRR | Mic: > 60dB Line: > 40dB (50Hz to 120Hz) |
Control | 0 to 10VDC or 0 to 10KΩ |
Attenuation Steps | 0 to 90dB (>90dB at 0VDC control) |
Dimensions | 0.7 x 3 x 1.6" (1.7 x 7.6 x 3.9cm) |