Simple Motor Controller 18v7, partial kit with included hardware.
Simple Motor Controller 18v7, fully assembled.
The lowest-power controller version (18v7) is available with the power capacitor and connectors included but not soldered in (as shown in the left picture above) or with the power capacitor and connectors pre-installed (as shown in the right picture above).
The power capacitor has a significant effect on performance; the included capacitor is the minimum size recommended, and bigger ones can be added if there is space. A bigger capacitor might be required if the power supply is poor or far (more than about a foot) from the controller.
Simple Motor Controller 18v7 bottom view with dimensions.