Radio Design Labs ST VCA2 Voltage Controlled Amplifier

Radio Design Labs ST-VCA2
Voltage Controlled Amplifier

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Radio Design Labs 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.

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 kW 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 kW 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 kW 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.

TMGR# STVCA2

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