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.
RDL ST-VCA3 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
- ST-VCA3 Voltage Controlled Amplifier1
- Inputs (2)10kΩ balanced or unbalanced, bridging
- Input Signal
- -20 dBu (-22 dBV) to +6 dBu (for normal output level: +4 dBu, 100Ω)
- -10 dBu to +16 dBu (for 250 mW, 8Ω output)
- Output Load Impedance)8Ω to 5kΩ (drives low or high impedance headphones)
- Output Signal (normal rated))+4 dBu into 100Ω
- Output Signal (maximum))250 mW into 8Ω, 20 Vp-p into 2kΩ
- THD+N)< 0.005% (0.0015% typical @ 1 kHz)
- Frequency Response)20 Hz to 40 kHz (± 0.25 dB)
- Noise)< -100 dB below normal operating level
- Dynamic Range)> 115 dB
- Gain)Adjustable from -2 to 24 dB
- CMRR)> 50 dB at 100 Hz
- Crosstalk< -65 dB (10 Hz to 20 kHz); < -80 dB @ 1 kHz
- Ambient Operating Environment)0°C to 55°C
- Power Requirement)GROUND-REFERENCED, 24 Vdc @ 200 mA
- Package Dimensions)2x2x4"
- Shipping Weight)0.205 lbs
- WEEE weight)0.15 lbs
