Voice Operated Relay

  • Switching Controlled by Voice Signal
  • Switching from Mic or Line Level Signals
  • Precise Threshold Adjustment
  • DPDT Switching Contacts
  • Open-Collector SLAVE Output
  • Recommended Power Supply ( Not Included )
    PS-24AS (USA)PS-24AX (International)


    The ST-VOX1 is an Audio Controlled Relay in the STICK-ON® series. When used in intercom or talkback 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 the 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.


    Mic Input:5 kΩ unbalanced line
    Line Input:200 kΩ unbalanced
    Control Outputs:Open-Collector @ 25 mA, suitable to drive indicators or Slave LCR
    Relay Contacts:Double-pole-double-throw
    Max. Switching Power:60 W, (220 Vdc, 125 Vac, 2A)
    Mic Input Sensitivity:Adjustable -80 dBu to -50 dBu
    Line Input Sensitivity:Adjustable -45 dBu to -15 dBu
    Indicators:Audio threshold LED (for setting sensitivity)
    Retrigger Delay:50 ms
    Release Delay Time Adjustment Range:Relay Contacts: 70 to 260 ms
    Slave open-collector output: 15 to 260 ms
    Activation Response TimeRelay Contacts: 5 ms
    Slave open-collector output: 3 ms
    Ambient Operating Environment:0° C to 55° C
    Power Requirement:GROUND-REFERENCED 24 Vdc @ 50 mA *
    * Assumes 20 mA max load at SLAVE
    Dimensions:Height: 0.7 in. (1.7 cm), Width: 3 in. (7.6cm), Depth 1.6 in. (3.9 cm)
    Package Type:Cardboard Box
    Package Dimensions:2 x 2 x 4 in.
    Shipping Weight:0.2 lbs.
    WEEE weight:0.15 lbs.
    Tariff code:8543.70.9860

    Related Products

    Switching & Control
    • ST-ACR1

      Line-Level Audio Controlled Relay - 0.5 to 5 s

    • ST-ACR1M

      Microphone Level Audio Controlled Relay - 0.5 to 5 s delay

    • ST-ACR2

      Line-Level Audio Controlled Relay - 5 to 50 s delay

    Related Products

    General Mounting Accessories
    • DMK-5

      Detachable Mounting Kit for RDL Modules

    • SR-4

      STICK-ON Series Mounting Rack - 7 modules

    • MB-1

      Mounting Kit - RU, ST and TX Series

    STICK-ON® Mounting Accessories
    • STR-H6A

      10.4" Rack Mount for 6 STICK-ON Series Products

    • ST-PBR4

      STICK-ON Mounting Bracket

    • ST-RRB1

      Rear rack rail mounting kit for any STICK-ON module

    • SMK-12

      STICK-ON Mounting Plate

    • STR-19A

      STICK-ON Series 19" Racking System - 12 modules

    • SR-12A

      STICK-ON Series 19" Mounting Rack - 12 modules

    • STR-19B

      STICK-ON Series 19" Racking System - 10 modules

    • SR-10

      STICK-ON Series 19" Mounting Rack - 10 modules

    General Wiring Accessories
    • DTB

      STICK-ON® Series Detachable Terminal Block

    TX™ Mounting Accessories
    • MB-1

      Mounting Kit - RU, ST and TX Series

    DIN Rail Mounting Accessories
    • DRA-35S

      STICK-ON DIN Rail Adapter - 1 module

    • DRA-35S6

      STICK-ON DIN Rail Adapter - 6 modules




    CAD FilesUnitsSizeFormat
    Engineering Functional BlockAmerican4.29 KBDXF
    Panel Diagram - EndAmerican3.22 KBDXF
    Panel Diagram - FrontAmerican24.49 KBDXF
    Panel Diagram - EndMetric3.15 KBDXF
    Panel Diagram - FrontMetric25.31 KBDXF
    High Res ImagesFormat
    Declaration of Conformity

    How To Buy

    Direct Dealer Program

    Becoming an RDL direct dealer is quick and easy. To become a direct dealer, your company must meet the following requirements:

    • Must be an A/V contractor, sound contractor or system integrator
    • Must possess a current resale certificate for your state
    Click here to submit a new direct dealer account inquiry

    Buy Online