RDL STVOX-1 Audio Controlled Vocal Relay

OUR PART #: STVOX-1 MFR #: STVOX-1

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Radio Design Labs' ST-VOX1 is an Audio Controlled Relay in the group of STICK-ON series products by Radio Design Labs. ...Read more

RDL STVOX-1 Audio Controlled Vocal Relay Image 1
RDL STVOX-1 Audio Controlled Vocal Relay
Our Price: $147.92
List Price: $197.22
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Product Overview

Radio Design Labs' ST-VOX1 is an Audio Controlled Relay in the group of STICK-ON series products by Radio Design Labs. These products are designed for quick, convenient installation, and reliable operation in a variety of control applications. The ST-VOX1 is specifically designed to switch reliably on voice signals.

When used in intercom or talk back applications, the ST-VOX1 may be triggered directly from an unbalanced microphone. In many such installations the microphone or other audio source must be preamplified, making the ST-VOX1 an ideal mate to work with RDL's STM-1 preamp. The unbalanced output from the STM-1 can be used to trigger the ST-VOX1, while the STM-1 balanced output is used for the audio feed.

The ST-VOX1 releases very quickly, but holds on through very short pauses in syllables common to speech. These time constants allow the design of a communications system yielding comfortable two-way conversation.

Features:

  • High-impedance inputs connect across any unbalanced audio line
  • Multi-turn sensitivity adjustment permits precise threshold setting
  • Multi-turn DELAY control adjusts relay release delay
  • Tight passband filtering yields triggering on voice frequencies
  • SECONDARY open-collector terminal allows additional relays to be added for more contacts (RDL'sST-LCR1)
  • SECONDARY terminal may be used with remote switch to manually override the control circuit and turn on the relay

Specifications:

  • Mic Input: 5 kohm unbalanced line
  • Line Input: 200 kohm unbalanced
  • Control Outputs: Open-collector @ 100 mA, suitable to drive indicators or secondary LCR
  • Relay Contacts: Double-Pole-Double-Throw
  • Maximum switching power: 60 W, 125 VA
  • Maximum switching voltage: 220 Vdc, 250 Vac
  • Maximum switching current: 2 A
  • Maximum carrying current: 3 A
  • Mic Input Sensitivity: Adjustable -75 dBu to -25 dBu
  • Line Input Sensitivity: Adjustable -45 dBu to -15 dBu
  • Indicators: Audio threshold LED (for setting sensitivity level)
  • Retrigger Delay: approximately 50 ms
  • Release Delay Time Adjustment Range:
    • Relay Contacts: 70 to 260 milliseconds
    • SECONDARY (open-collector output): 15 to 260 milliseconds
  • Activation Response Time:
    • Relay Contacts: 5 milliseconds
    • SECONDARY (open-collect. output): 3 milliseconds
  • Power Requirement: 24 to 33 Vdc @ 50 mA, Ground-referenced

Note:

Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product. Please see the "Accessories" tab for more information on the PS-24AS power supply.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Product Documents

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