The Dimension Engineering DE-SWADJ 3 is a larger version of the DE-SWADJ adjustable step down voltage regulator. It can process 3A of current, typical ripple is 25mV and under ideal circumstances the regulator can be up to 96% efficient.
This set of wheelchair motors makes great heavy duty robot motors. One left motor and one right motor. They are right angle gear drives have been modified to include encoders. They are 24VDC and the operating speed is 120 RPM.