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43. FK408



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Just as we can demonstrate light activated switches, the FK408 uses sound as its triggering input. A microphone detects the sound which is amplified to drive a relay. A 0-60 second, adjustable timer can be set to hold the output relay on for a preset time after the sound has stopped. As a class project, students may experiment with various filter designs inserted after the microphone to make the FK408 only operate at specified frequencies.

Technical Specification

  • Power Supply : 12VDC @ 60mA max.
  • Sensitivity and Time Delay
  • Adjustment : On-Board Trimmer Potentiometers.
  • Maximum Contact Load : 10A @ 125VAC and 5A @ 220VAC.
  • PCB Dimensions : 2.49" x 2.15" x 0.8" (63.25mm x 54.61mm x 20mm)
  • Recommended Housing : FB10

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