Supplino is a variable table feeder that you can build yourself

Working with electronics requires access to stable power in a variety of voltages. Some components require 3.3V and some require 5V. Still others require 9V or 12V – there are many possibilities. You can keep a variety of wall warts on hand, but a variable benchtop power supply is a more convenient option. Supplino is a choice and this guide by Giovanni Bernardo and Paolo Loberto will tell you how to build one.

Supplino can accept anything from 4 to 40 volts and can output anything from 1.25 to 36 volts, with a maximum of 5A. An XH-M401 module with an XL4016E1 DC-DC buck converter handles voltage regulation. Technically, you could use it alone to power your components. But adding an Arduino Nano (or Nano Every) board makes the experience much more user-friendly. It monitors the output of the power supply and drives a 1.8″ 128×160 TFT LCD screen, which displays current voltage, amperage and power.

The Arduino is powered by a second 5V buck converter. It uses a relay to control the power going to the main down converter. A remote potentiometer controls the voltage. Two banana jacks make it easy to attach alligator clips or any other cables your project needs. You can pack all of these components into a tidy and attractive 3D printed case that’s compact and fits on any desktop. You have many options for input power, but a laptop power supply is a good choice.

More details on the Supplino can be found in his article here.

Alan A. Seibert