Doug Fleenor Designs 125-5
1 to 5 DMX Isolation Amplifier and Splitter


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The Doug Fleenor Design 125-5 DMX512 Isolated Splitter /Amplifier provides 5 outputs from a single DMX512 input. It also amplifies and isolates the signal as well.

It allows the DMX signal to be split without the possibility of reflections from one signal path interfering with the signal to a device on a different path. Each output is electrically isolated from the input, and every other output, by 2500 volt optical couplers. Each output has its own line driver and associated power supply. By isolating each output, electrical noise and hazardous voltages on one output are prevented from affecting (or damaging) devices on the input or another output.

Doug Fleenor Design 125-5 Features/Benefits:

  • Input is Electrically Isolated from Output - Console is protected from failed dimmers, lightning damage, and any other cause of high voltage on the control cable.
  • Outputs are Isolated from Each Other - Color changers, moving lights, other dimmers are protected from each other.
  • Outputs are Separately Buffered - Reflections, short circuits, etc. on one output cannot affect another output.
  • No User Adjustments - Easy "fool proof" installation.
  • DMX Pinouts Printed on the Unit - Assists in proper control wiring.
  • Powder Coated 1/10" Aluminum Chassis - Rugged and attractive for years of service.
  • Gold-Plated Neutrik 5-pin Connectors - Assures reliable connections.
  • All Integrated Circuits are Socketed - Eases field service.
  • Uses 2500 Volt Optical Couplers - Easily isolates line voltage failures. Usually withstands electrical storm damage.
  • Forty Times Faster than DMX Data Rate - Reliable, high speed data throughput. Units can be cascaded.
  • "Air gap" Circuit Board Located Under Isolator - Prevents arcing across circuit board.
  • 60 mA Drive Current - Reliably drives long control cables.
  • Power and Input Signal Indicators - Simplifies system trouble shooting.
  • Mr. Fleenor is active in ESTA, PLASA, and USITT - Products are designed to the latest specifications.
  • 5 year warranty - Peace of mind.

Doug Fleenor Design 125-5 Specifications:

  • Input circuit: EIA-485 receiver with 120 ohm termination resistor between +Data and -Data
  • Input signal: 0.2 volts minimum, 12 volts maximum
  • Output circuit: EIA-485 driver
  • Connectors: Gold plated 5 pin Neutrik D-1 Series
  • Isolation: 2500 volt optical coupler, 1500 volt split bobbin transformer
  • Power input: 100 - 120 volts, 50/60 hertz, 12 watts (208 - 240 volt optional)
  • Colors:
    • Top, bottom and sides: Silver hammer tone
    • Front and back: Black
  • Dimensions (D x H x W): 6.5" x 1.7" x 8.25"
  • Weight: 3.3 lbs.
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