Burst VSA Video Detect / Loss of Video Switch with Audio Follow


The Burst Electronics Model VSA detects the presence of composite video at its A input and outputs this video. If loss of video on the A input is detected then the unit switches to the B input lights a Red LED and energizes an internal "tally" relay. This relay may be used to control external devices. The tally relay has both normally closed and normally open contacts (Form C relay). This Model includes stereo audio switching audio follow video.

The video detection process utilizes a sophisticated sync separator circuit and a micro controller IC to analyze the A input. The composite sync tip amplitude vertical sync horizontal sync and frame pulse are all analyzed by the micro controller to determine the quality of the incoming video on the A input.


  • Video detect: Sync tip vertical sync and frame pulse (selectable) of A input
  • Sync Detect Level: -5 to -30 IRE adjustable
  • Delay: 0.1 seconds
  • Indicator: LED for A input
  • Input/Output: 1 Volt standard video
  • Input Impedance: HiZ or 75 Ohms 1% looping (jumper/switch selected)
  • Output Impedance: 75 Ohms 1%
  • Video Connector: BNC
  • Tally Connector: 4 pin MiniDIN
  • Dimensions: 4.4 W x 1.2 H x 2.4 D (inches)
  • DC Powered: 11-14 Vdc (see chart for current requirements)
  • Wall module (included): 120 VAC 60 Hz 12 Vdc 500 mA UL Listed
  • Warranty: Two Years Parts and Labor

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