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PCB revision 0.8a, 0.9, 0.9a

For these revisions forward the only difference between the Duex 2 and Duex 5 is only two stepper drivers are populated on the Duex 2.

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PCB revision 0.8 and earlier

For these revisions the Duex 2 had only 2 fan, heater and temperature channels populated.

Duex 5


Version 0.8 had a 6th fan MOSFET and Header added

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0.6 and 0.7

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Duex 2

On the Duex 2 only the first two stepper and heater channels are be populated, only the first 3 servo channels are enabled (although all 5 headers may be populated)


Version 0.8 had a 6th fan MOSFET and Header added

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0.6 and 0.7

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Warnings and Cautions

All warnings and cautions apply to both the Duex 5 and Duex 2.

  • The VFAN voltage can be selected by a jumper as VIN , 12V (internally generated) or 5V. ONLY ONE JUMPER SHOULD BE FITTED. Using more than one jumper could cause permanent damage to the Duex 2/5 and/or the Duet 2.
  • The PWM channels for servos or other uses are shared with the heaters. DO NOT HAVE A HEATER PLUGGED INTO A CHANNEL YOU CONFIGURE PWM. Doing so will cause the heater to heat in an uncontrolled manner and potentially cause a fire.
  • Be aware the VIN connector has the VIN/GND terminals reversed to facilitate easier mounting back to back.
  • In order to use the 12V internal supply for LEDs/FANs the 12V EN jumper must be fitted. Do not fit this jumper if you are not using the 12V internal supply
  • In order to use an optional external 5V supply for the PWM servos and/or the PWM fan channels the 5V AUX jumper select must be fitted between 5V EXT and 5V AUX. Using an external 5V supply is necessary if the total 5V power required to run the connected servos, fans and LEDS is greater than 1A.
  • The TWD and TWC pins on the "GPIO and I2C header" were labelled the wrong way around on the silkscreen (for version 0.6,0.7 and 0.8) and in the diagram for version 0.6 and 0.7. The diagram for version 0.8 has them labelled correctly.


As of the Duex5 V 0.9, the “INT 12V EN” jumper has been moved to the far left of the board, next to an “always on” fan header. It is now to the left of the servo headers.

Brandon Breymeier - Reply

Where is E7 Heater Pin as mentioned on PWM/Servos warning text above?

rief - Reply

Error in the text, should read E2-E6. Will fix it next time I update this diagram. Thanks.

Tony -

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