Radio Design Labs ST-VOX1 Voice Operated Relay

$111.40
PA SKU # RDL STVOX1 MFR # ST-VOX1 UPC # 813721011183
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  • Product Highlights
  • Switching Controlled by Voice Signal
  • Switching from Mic or Line Level Signals
  • Precise Threshold Adjustment
  • DPDT Switching Contacts
  • Open-Collector Slave Output

Voice Operated Relay

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.
  • Switching Controlled by Voice Signal
  • Switching from Mic or Line Level Signals
  • Precise Threshold Adjustment
  • DPDT Switching Contacts
  • Open-Collector SLAVE Output
  • 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 -75 dBu to -25 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
  • Power Requirement: GROUND-REFERENCED 24 Vdc @ 50 mA *
  • * Assumes 20 mA max load at SLAVE
  • output
  • Ambient Operating Environment: 0 C to 55 C
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