ST-VCA3 데이터 시트보기 (PDF) - Unspecified
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ST-VCA3 Datasheet PDF : 2 Pages
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STICK-ON® SERIES
Model ST-VCA3
Voltage Controlled Amplifier
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
The ST-VCA3 is a voltage controlled preamplifier in the convenient line of
STICK-ON products, featuring the superior engineering and components
common to RDL products. The ST-VCA3 may be rack or surface
mounted with optional STICK-ON series accessories. The ST-VCA3
gives you the advantages of audio level remote control with the added
convenience of STICK-ONs! STICK-ONs are designed, built and rated
for continuous duty in professional A/V systems.
ASSOCIATED REMOTE CONTROL EXAMPLES:
► D SERIES-RLC10K Wall mounted remote controls
► D SERIES-RLC10KM Wall mounted remote controls with muting
► D SERIES-RLC10 Rotary encoder remote control
► D SERIES-RLC10M Rotary encoder remote control with muting
► D SERIES-RLC3 Remote control with preset levels
► RLC10R Rotary encoder remote control
► AMS-10K Linear potentiometer remote control
APPLICATION: The ST-VCA3 is a high performance voltage controlled amplifier with two inputs and one
output. The line input is designed to accept an input signal with operating levels between -20 dBV and +4 dBu.
The microphone input accepts low or high impedance microphones with output levels from –60 to –44 dBu.
Only one of the inputs may be used at a time. A multi-turn trimmer is provided for setting the correct input gain
according to the dual-LED VU meter located directly in front of the gain control. The intended output level is +4
dBu for 10 Vdc at the CTRL input terminal. The green metering LED begins illuminating at 15 dB below
+4 dBu. The green LED progresses to full intensity at +4 dBu. The adjacent red LED illuminates at +4 dBu.
Terminals are provided for connection of an external ramp generator (0 to 10 Vdc) or a linear taper 10 kΩ
potentiometer remote control. The RDL RLC10K is most commonly used. Three terminals are provided for
external control; a single-pair shielded audio cable is recommended. If a remote volume control with a mute
button is preferred, an RDL RLC10KM may be connected directly to the ST-VCA3. The regulated +10 Vdc
control OUT voltage provides sufficient current to power an RLC10KM. The CTRL terminal does not load the
external control voltage, therefore a single 10 kΩ control may control multiple ST-VCA3s simultaneously. The
LEVEL LED varies in intensity corresponding to the VCA control voltage. This provides a relative indication at
the module of the level setting on the remote control.
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 a
rack or common equipment location, audio level control may be extended outside the rack using an ST-VCA3.
Many installations benefit from avoiding long-term wear from audio running through a 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 adjust audio levels using an ST-VCA3. The
ST-VCA3 is primarily intended for line-level attenuation although 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.
The ST-VCA3 operates from a 24 Vdc ground-referenced power supply.
Wherever it is desirable to keep audio signal sources at an equipment location while providing compact, high
quality remote level control, the ST-VCA3 is the ideal choice. Use an ST-VCA3 and its associated remote
control individually or combine them with other RDL products as part of a complete audio/video system.
RDL 659 6th St. Prescott, AZ., USA 86301 (928) 443-9391 FAX (928) 443-9392 www.rdlnet.com
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