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Common AMS1117 Voltage Regulator in SOT-223 package. 3.3V output version.
Common AMS1117 Voltage Regulator in SOT-223 package. 5V output version. Replacement part for Arduino Mega
The LM7805!! The universal goto linear voltage regulator. Tried and tested design over 30 years old! Simple, stable, effective and cheap! you're going to need a few of these for your projects!! 5v output at 1A capable.