This powerful step-up/step-down regulator efficiently produces a fixed 24V output from input voltages between 3V and 30V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below the regulated voltage.
SparkFun's minimal design approach to Arduino. This is a 5V Arduino running the 16MHz bootloader.
A ready to ship prebuilt All-Terrain 4WD robot. It features 10" tiller tires and IG42 078RPM Gear motors. Controller, battery, and charger included. Also included is a cover with 80/20 1" extruded aluminum rails.