ST-VCA2 RADIO DESIGN LABS, ST-VCA2 Datasheet

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ST-VCA2

Manufacturer Part Number
ST-VCA2
Description
RDL VOLTAGE CONTROLLED AMPLIFIER, POWER REQUIREMENTS: 24-33 VDC, 70 MA, GROUND REFERENCED, APPLICATIONS: USE IN APPLICATION REQUIRING SMOOTH LEVEL CONTROL FROM A REMOTE CONTROL PANEL, POTENTIOMETER
Manufacturer
RADIO DESIGN LABS
Datasheet
STICK-ON
Model ST-VCA2
Voltage Controlled Amplifier
ANYWHERE YOU NEED...
You Need The ST-VCA2!
The ST-VCA2 is part of the group of versatile STICK-ON products from Radio Design Labs. STICK-ONs feature the
advanced circuitry for which RDL products are known, combined with unequalled versatility in mounting possibilities.
The durable adhesives provided with the ST-VCA2 permit permanent or removable mounting. Numerous available
mounting accessories, brackets, rack-mount and tabletop chassis are optionally available to facilitate any system
design.
FUNCTIONAL DESCRIPTION: This VCA is designed to give you the maximum flexibility in application. Audio
inputs are provided for both microphone and line level signals. The output is line level and may be connected either
balanced or unbalanced. The ST-VCA2 can be used as a remote-gain-controlled mic preamp with line level output.
The ST-VCA2 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 -17 dBV and +4 dBu. The microphone input
accepts low or high impedance microphones with levels from –60 to –40 dBu. Only one of the inputs may be used at
a time. A multi-turn gain potentiometer is provided for setting the correct operating level of the module. A dual led
VU ballistic meter located directly in front of the gain trimmer provides for accurate level adjustment. The nominal
correct operating level is +4 dBu at the module output with a10 Vdc control. The green LED intensity indicates levels
up to +4 dBu. The red LED flashes for average signal levels greater than +4 dBu. The gain trimmer, with the
assistance of the LED meter, can produce the normal +4 dBu output for line level signals as low as –17 dBV, and
mic signals as low as –60 dBu.
Terminals are provided for connection of an external linear taper 10 kΩ potentiometer, typically an RDL RLC10K or
RLC3 Remote Control. Three terminals are used for the external control; a single-pair shielded audio cable is
recommended. If only a single pair (unshielded) is available, the ST-VCA2 may operate from two conductors by
installing a 1.5 kΩ resistor (included) between the CTRL and 10 V OUT terminals on the module. The control
terminal does not load down the control voltage derived from the external control, therefore a single 10 kΩ control
may control multiple ST-VCA2s simultaneously. This feature is intended only for control of multiple zones, not for
stereo control (RDL stereo VCA products are recommended for stereo installations). Module operation is from a 24
Vdc ground-referenced power supply.
TYPICAL APPLICATION: The ST-VCA2 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-VCA2. Many installations benefit from avoiding long-
term potentiometer wear from audio running through the potentiometer. An ST-VCA2 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 anST-VCA2. The ST-VCA2 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-VCA2 may serve as a
remote controlled microphone preamplifier. For phantom powered microphones, an RDL microphone preamp or
RDL phantom adapter is recommended.
The low noise, low distortion, audio clarity and exceptional versatility makes this module ideally suited to a wide
variety of demanding audio applications. Use this module in conjunction with other RDL RACK-UP
TX™, or FLAT-PAK™ series products as part of a complete audio/video system.
Audio Level Control from a DC Voltage
Audio Level Remote Control
Two or Three Wire DC Control
VCA with Microphone or Line Level Input
VCA with Line Level Output
VCA with LED Metering of Operating
Level
RDL
659 N. 6
®
th
SERIES
St.
Prescott, AZ., USA 86301
(928) 443-9391
FAX (928) 443-9392
www.rdlnet.com
®
, STICK-ON,

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ST-VCA2 Summary of contents

Page 1

... The ST-VCA2 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-VCA2 may serve as a remote controlled microphone preamplifier. For phantom powered microphones, an RDL microphone preamp or RDL phantom adapter is recommended ...

Page 2

... STICK-ON ® SERIES Model ST-VCA2 Voltage Controlled Amplifier LINE LINE SIGNAL SIGNAL FROM FEEDING BALANCED BALANCED SOURCE EQUIPM ENT L 10V 10V PUT PUT CONNECTING EXTERNAL CONTROL ST-VCAs 10K (TW O ZONE CONTROL LINEAR TAPER NOT FO R STEREO) OR POW ER / USE RDL'S RLC10K CONTROL ...

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