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Bogen Communications, Inc. - AFDS2
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Amplifier Failure Detector and Substitutor

Model: AFDS2

  • Supervises both main and standby power amplifiers
  • Automatically transfers operation to standby power amplifier
  • LEDs and fault alert tone notify user of a 2 dB
  • or greater drop in either amplifier’s output
  • Automatically restores operation to main power amplifier when trouble is corrected
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AFDS2 Automatic Failure Detector and Substitutor provides continuous electronic supervision of the main and standby power amplifiers in a sound system, and substitutes the standby power amplifier should the main power amplifier’s output drop by as little as 2 dB*.The changeover is almost instantaneous with virtually no loss of signal, thereby assuring uninterrupted performance.This device is a critical, highly desirable component in systems with a dedicated emergency announcement amplifier. The AFDS2 pulses a 40 kHz frequency into the inputs of the main and standby power amplifiers and continuously analyzes their output. If the 40 kHz level from either amplifier should fall below 2 dB*, a fault alert tone will sound, indicating a failure. Front, panel-mounted LEDs indicate which (main or standby) amplifier has failed.The fault alert tone may be silenced by momentarily pressing the SILENCE button; however, the LED will stay on for the duration of the malfunction and the SILENCE button will automatically reset when the failure is corrected.
  • Supervises both main and standby power amplifiers
  • Automatically transfers operation to standby power amplifier
  • LEDs and fault alert tone notify user of a 2 dB
  • or greater drop in either amplifier’s output
  • Automatically restores operation to main power amplifier when trouble is corrected
  • Rear-panel screwdriver-adjustable controls for setting the oscillator level and the detector levels and sensitivities
  • Operates with 25V or 70V constant-voltage systems, balanced or unbalanced
  • Screw terminal or phono jack connections
  • Operates from 120V AC or 12V DC
  • Standard 19-inch rack mounting
  • Front panel made of #16-gauge cold-rolled steel, finished in black enamel
 
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