- Description
Details
The RDL ST-VCA3 Voltage Controlled Amplifier 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.
- Features
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
- Specification
Inputs (2) Mic: 200 Ω balanced; 5 kΩ unbalanced Line 30 kΩ bal. bridging or unbalanced Input Levels (for +4 dBu output) Mic: –44 dBu to –60 dBu (150 Ω source)Line: ‑18 dBu (‑20 dBV) to +4 dBu Output Signal (normal rated) +4 dBu, 150 Ω 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 Ω source; 50 dB gain) Line: <‑78 dB below CMRR Mic: > 60 dB; Line: > 60 dB, (50 Hz to 120 Hz) Control Input 0 to 10 Vdc or 0 to 10 kΩ Linear Attenuation Range 0 to 90 dB (>90 dB at 0 Vdc control) Power Requirement GROUND‑REFERENCED, 24 to 33 Vdc @ 50 mA Dimensions (H x W x D) 0.7" (17 mm) x 3" (76 mm) x 1.6" (39 mm) Weight 0.25 lbs (0.113 kg) - Reviews
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