ST-VCA3

RDL ST-VCA3 - Voltage Controlled Amplifier

The RDL ST-VCA3 is a high-performance voltage controlled amplifier designed for professional AV installations requiring remote audio level control. It features two inputs - microphone and line - and one line-level output, allowing precise adjustment of audio levels via DC voltage (0-10 V), potentiometer, or remote control panel.

Ideal for systems where audio remains localized in an equipment rack while control is extended remotely, the ST-VCA3 eliminates long-term wear issues associated with mechanical potentiometers. Its LED metering system ensures accurate output level monitoring, while multi-turn trimmers allow precise gain calibration.

The ST-VCA3 can also function as a remotely controlled microphone preamplifier, making it suitable for applications such as wall-mounted microphone level control. Powered by a 24 V DC ground-referenced supply, it can be used standalone or integrated with other RDL modules in a complete AV system.

Functionality:

• remote audio level control via DC voltage (0-10 V)
• control via remote panel or 10 kΩ potentiometer (e.g., RDL RLC10K)
• microphone input - supports low and high impedance microphones
• line input - operating levels from -20 dBV to +4 dBu
• line-level output - +4 dBu at 10 V DC control input
• LED metering - dual-color VU meter for output level monitoring
• multi-turn trimmers – precise gain adjustment
• suitable for installations with localized audio and remote control

Features:

• one active input - microphone or line
• green LED - illuminates from -15 dB to +4 dBu
• red LED - indicates +4 dBu level
• compatible with external ramp generators
• high-quality audio path - immune to potentiometer wear
• integrable with other RDL modules
• power supply: 24 V DC (ground-referenced)

The RDL ST-VCA3 is a reliable solution for professional AV systems where precise audio level control, durability, and installation flexibility are essential.