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Bogen VAR1 Voice-Activated Relay

Voice Activated Relay, DPDT relay, VOX detect circuit, 600-ohm transformer, Slide switch to select pre-amp or line inputs


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Bogen VAR1 Voice-Activated Relay

The Bogen VAR1 Voice-Activated Relay is a DPDT relay device that is activated when an audio signal is detected at the microphone pre-amp or at 70V, 25V, or 600-ohm line level inputs. A slide switch is included to select the pre-amp or the line inputs. The VOX detect circuit also includes volume, sensitivity, and delay controls. The audio output is an isolated 600-ohm transformer. The unit operates from a DC power source. Its applications include muting a sound system in response to a microphone or telephone page, activation of accessory security equipment or activation of a zone paging module.

Full specifications (PDF)

Manufacturer part number: VAR1

General Information

Physical Characteristics

  • Height: 3.9"
  • Width: 5.4"
  • Depth: 1.4"
  • Weight (Approximate): 2 lb


  • Additional Information:
    • Four levels of signals: microphone, 600-ohm line, 25V, and 70V speaker systems
    • Built-in balanced, low noise, high gain microphone pre-amp
    • Monitors audio activity over a wide range of input voltages
    • Transformer-isolated, 600-ohm small signal level
    • Separate microphone pre-amp gain control
    • Trigger threshold adjustment


  • Limited Warranty: 2 Year