LM2596S Step-Down LED Voltmeter Module

Features

•  25-turn potentiometer is installed on board to facilitate granular output voltage settings
• Pin spacing of 0.6″ x 1.5″ to easily affix into the 0.1″ pin spacing of most breadboard and perfboard.
• The module is up to 94% efficient.  The higher the output voltage the higher the efficiency.  The LM2596 datasheet linked to above provides more specific details regarding efficiency.
• Up to 3A of supply current.  Depending on input and output voltage a heatsink should be affixed the LM2596 (not included)
• Large output range of 1.5V-33VDC
• Low dropout of 1-2VDC, depending on load
• Only 4 pins are required to be soldered onto the board