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2QD controller.

Modification to remove regen braking.

The 2QD circuit board is designed to be assembled in two ways - with or without regenerative braking. This page details the changes between the two versions.

The change is extremely simple and the two components to be altered are indicated in the diagram with a red and a blue arrow.

Both resistors are 10K.
For the standard version the blue arrowed resistor is present and the red arrowed resistor is absent.
To disable regen braking remove the blue arrowed resistor and fit the red arrowed resistor.

It's as simple as that!

More information

The full circuit diagram, with discussion and board layouts is available to subscribers to 4QD-TEC. This also includes a historical review of its development, highlighting some of the object lessons learned en route.

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