This is an LM7805 Voltage Regulator module that can be used to provide stable power supply to an Arduino. It has a heatsink to get rid of any excess heat that may build up during usage.
The module provides a constant 5v output voltage with a maximum output current of 1.2A no matter what the input voltage fluctuations (such as that found when using an external Lead-Acid or Lithium Battery or even solar panel).
The board size : 5.7cm * 2.3cm
Input voltage : input voltage nonpolar, ac and dc , range: 7.5v - 20v
5 v output voltage
Maximum output current : 1.2A
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