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Custom Module:
Author Aarón González Iglesias
Type Power Regulator
Style Perfboard
Complexity Easy

DC to DC power regulator, 5V output, max 1A.

This module can be used for powering the rest of the circuit at 5V when your power supply or batteries provide at least 7.5V.

Electronic circuit

Bill of materials:

  • 1x 7805
  • 1x Switch
  • 1x Double connector with screws
  • 1x 5mm LED
  • 1x 220Ω, 1/4 resistor
  • 1x 10µF electrolytic capacitor
  • 1x 1µF MKT capacitor
  • 1x 4.7nF MKT capacitor
  • 2x Straight female headers (usually sold as 40-pin strips)
  • Some thin wire
  • Some heat shrink tubing


The input voltage should come from a 7.5V-35V direct current power supply, which is connected to the double connector with screws.

The switch turns on and off the entire circuit. When the circuit is turned on the LED will light up, and a constant output voltage of around 5V will be available at the female headers.

The input connector is not standard, but the output voltage uses a standard power connector, which is intended to be plugged to some power pins on a Main Board, so this regulator provides all required power to the rest of the circuit.

As you may know, the 7805 is a very inneficient power regulator, so it will get very hot and shut-down automatically if you take more than a few milliamperes from it. The board hasn't got enough room to place a heatsink, so if you need to regulate too much power you should avoid this circuit and use a more complex, expensive and efficient one.

This circuit is pretty similar to the official 5V DC-to-DC regulator (PWR-DD5). Most of its documentation is also valid for this circuit.



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