LM2596 Adjustable DC-DC Buck Converter Module

Battery packs and wall adapters rarely output the exact voltage a project's electronics need, and simply wasting the difference as heat through a linear regulator gets impractical once any real current is involved. This module solves that with switching regulation instead - the LM2596 chip converts a higher input voltage down to a lower, stable output at up to 92% efficiency, so far less power is lost as heat compared to a linear regulator doing the same job.

An onboard trimmer potentiometer sets the output anywhere from 1.25V to 30V, which covers the input voltage a project's electronics actually need without requiring a fixed-voltage module. Rated for a 3A maximum output and a wide 4V to 35V input range, it comfortably handles stepping a 12V or 24V battery pack down to the 5V or 3.3V rail most microcontrollers and sensors expect.

Common uses are powering a 5V or 3.3V microcontroller system from a 12V or higher battery pack, regulating solar panel or car battery voltage down to a usable level, and any build where a fixed-voltage regulator module doesn't match the actual voltages on hand.