This is a simple, beginner-friendly adjustable bench power supply project that uses the LTC3780 buck-boost switching regulator controller to control the voltage and current output. The power supply design requires a barrel jack power adaptor input between 4V-36V and outputs (0.8V-29.4V || 0.3A-6A) when using a 12V 5A (60W) power supply input.

This design is inspired by Great Scott. You can find his building instructions for the electronic components and wiring here:

Instructables: https://www.instructables.com/Build-your-own-Variable-Lab-Bench-Power-Supply/

Youtube Video: https://www.youtube.com/watch?v=wI-KYRdmx-E

From his design, I have changed it to use a barrel jack input instead of having a 12V 5A power supply inside the casing. This is to:

-Reduce the size of the power supply (125x90x80 cm).
-Reduce the project cost (total $40 AUD).
-Allow different power supply inputs.

I have also designed a 3D printable casing.

The 3D-printed casing is held together using 4x M3 nuts and bolts. The nuts may need to be glued to the casing to prevent them from falling out. Some sanding may be required for a better fit.

Most of the components is either a press-fit or comes with bolt threads and is simply screwed on. Only the barrel jack adaptor may need gluing to the back plate. I used some construction adhesive and then sanded it down after it was dried.

Updates:
26/07: There are now two version of the back plate. The Back Plate (Flat version) allows the whole thing to be printed with no supports in exchange for more difficulty when gluing.

The parts list:

(Note: feel free to use cheaper alternatives)

• 1 x LTC3780:
  Amazon: https://amzn.asia/d/08AWnh9Z

• 1 x Digital Voltmeter Ammeter Dual Display
  Amazon: https://amzn.asia/d/07P0mRgN

• 2 x Binding post
  Amazon: https://amzn.asia/d/0dI3RWtD
  Temu: https://share.temu.com/pTNyZf42UtA

• 1 x 200kΩ Potentiometer
  Temu: https://share.temu.com/ZUHTL2faw4A

• 1 x 500kΩ Potentiometer
  Temu: https://share.temu.com/Z6Dpp77W7fA

• 1 x Breadboard-Friendly 2.1mm DC Barrel Jack
  Amazon: https://amzn.asia/d/07pW7jbe
  Temu: https://share.temu.com/NvLf1WwMZbA

• 2 x Potentiometer Knobs
  Temu: https://share.temu.com/w7P23wxZtBA

• 1 x Rectangle Rocker Switch
  Amazon: https://amzn.asia/d/0cCtYy3Q
  Temu: https://share.temu.com/CvACIgjwCyA

• 1 x 2.1mm DC Barrel Jack Power Adaptor (between 4-36V)
  (Note: I used one rated 5V 2A as I didn't need above 9V, but refer to the LTC3780 datasheet for more details)

• 4 x M3 Bolts and Nuts

P.S.: This is my first project. If there is a problem with anything, I will try to fix it when I have time. Also, any feedback is appreciated (please be nice).