Arduino power supply regulator

  • 100 uF capacitors (2) - careful of the silver line which faces the negative side
  • 7805 5V voltage regulator (1)
  • RED led and 560 Ohm resistor


Arduino power supply regulator

The purpose of this section is to take a 7-12v power supply (typically a 9V DC plug) and regulate it down to 5V needed by the microcontroller chip. The red and blue leads coming off left should be connected to whatever input power you’re using, but absolutely do not use more than 12v or you’ll fry things. Also, connect the top and bottom rails together at this point. If you’re piggybacking off an existing Arduino to program the chip (described later on) you can also connect the power rails directly to the +5V and GND.


Arduino power supply regulator during using

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