Mini DC-DC Buck Converter Step-Down Power Module Output 0.8V-20V 2-3A
This is a mini DC-DC buck converter STEP-DOWN power module with a tiny size of 22x17x4mm, capable of driving a load up to 3A with high efficiency. Simply connect a 4.5-28V DC power supply on the input and adjust the ouput voltage using the pot (see photo). This is a STEP-DOWN module, so the output must be at least slightly lower than the input voltage.
The benefit of a buck converter vs. a linear regulator is that the voltage difference is not converted into heat. This would be a good option to drive LEDs, servos or small motors.