Here are some photos of the Rev Robotics Spark Max speed controller’s circuit board. They aren’t the best quality but should at least show you some of the details.
This is just a brief look with some photos of the components. This is a Dimension Engineering Sabertooth 2×25 motor driver. Just a note the large electrolytic capacitors are not in the images.
This is just a brief look with some photos of the components. This is the Fingertech Robotics Tiny ESCs. These compact ESC use Allego A3950 Full-Bridge Motor Drivers and a Microchip PIC12F683 microcontroller.