5V, 300mA Step-Down Voltage Regulator D24V3F5

Does exactly as stated. Be sure to tie enable to VIN as it has a tendency to float on occasion. Be aware of your current draw as this one is 300mA, more then enough for many devices, but I doubt it would work well (if at all) for servos and such.

This is a little 5 volts converter that is useful when more current is required in your project and you don't want to drive too much the +5 volts from the Arduino board. It can be used for driving small Servo motor, as we know , it is always prefer to provide a different source of voltage to the servo , than only using the 5 volts of an Arduino. Welll construct , use very small place in your project.