EDC Diff Brain by Arrma

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Frederick, MD

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This product was added to our catalog on April 5, 2017.

The EDC (Electronic Diff Controller) Diff Brain is the link between the receiver, ESC and diff locking servos. It controls all three diff locking servos in models equipped with the diff locking function.

This electronic component provides control for the on-the-fly diff locking functionality meaning you can switch between different diff locking modes from your transmitter without having to bring your model to a halt.

It has been developed to work with the 4-way switch equipped Tactic TTX300 transmitter.


  • 1 x EDC Diff Brain
  • 1 x Instruction Manual


  • This item is sold as a spare part for vehicles with the diff locking functionality, or as an upgrade part for vehicles that can have the diff locking functionality fitted.
  • To upgrade a vehicle that can have the diff locking functionality fitted you will need 3 x ARA390103 and 1 x ARA390160