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This project is not completed yet - Last update: June 19, 2014
Lab Power Supply 0-20V 10mA-2AAuthor
Zoran Petkovic
June 5, 2012

Download file
PDF's with second unit built for easy assembly

Hello all!

First of all why build this particular power supply? Well if you are already into electronics you probably know how to build power supply but what if you are someone that's just starting up? what if you pick supply from internet and it works at first and then goes broken. For someone who's just starting it could be a problem troubleshooting someone else's design.

What i will try in this guide is to explain how things works with this design so builder that is inexperienced can at least troubleshoot it and fix it if needed. Other then this reason there is no other reason why you should build this particular supply, more or less linear supply have been the same since forever its just modern variations like programmable voltage/current and other fancy things that came into picture but core is the same.

The end result will be a Lab power supply with 0-20V and current limit 10mA-2A, Voltage/Current reading on a 7 segment display.

Here is mine prototype

   Continue reading. Click here to view the worklog.



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  • At 12 June 2015, 17:27:05 user Wiki wrote:   [reply @ Wiki]
    • This power supply can be used to power amplifiers or lab, because the LM723 is a very good voltage regulator, with good specifications, like noise figure. It has sense voltage, feedback, overall protection. It is a way good comparing to LM317 series. It can be used for a final year project at university, if it has a documentation. I've seen at my university, final year projects like power supply with digital view of voltage.

  • At 26 February 2015, 7:23:46 user Zoran Petkovic wrote:   [reply @ Zoran Petkovic]
    • I uploaded PDF with my second populated unit pictures ( On presentation page click download file) it should be easy to build in one go but if you have questions ask them in comments ill spare some time to answer.

  • At 25 February 2015, 17:47:39 user Gamini wrote:   [reply @ Gamini]
    • Dear Zoran,
      Oh, Very sorry to here this. Now you're paying for some others mistake, But appreciate your courage. Wish you good luck and Gods; Blessings.

      Bes regards


  • At 22 February 2015, 14:00:42 user Zoran Petkovic wrote:   [reply @ Zoran Petkovic]
    • 3 months ago my house caught fire from neighbours burning house resulting in my house burning down to along with the computer with files for this build, my prototype burned down also but i redone schematic and even built a new unit i can post schematic PCB files and silk screen files AS IS. for now i cant write any text for it, at the moment im working 2 jobs to rebuild my home. anyway ill post files in PDF and they will be on first page

  • At 22 February 2015, 12:46:57 user Gamini Patabendige wrote:   [reply @ Gamini Patabendige]
    • Dear Sir,
      This is a very interesting and usefull project. When can you post the balance content?
      Best regards

  • At 12 December 2014, 22:01:51 user electronics-student-from-spain wrote:   [reply @ electronics-student-from-spain]
    • Any news? I'm a newbie electronics student at an electronics vocational trainingschool, I can get most parts cheaply or for free at the lab. I have zero incomes, so I must get smart and do my equipment in the DIY way.

  • At 12 September 2014, 20:03:01 user Zoran Petkovic wrote:   [reply @ Zoran Petkovic]
    • @george schematic have some mistakes also the pcb, once i get time to fix the files will write complete text im sorry i couldn't do this in one go but work i do demands a lot of my time stay tuned the prototype works really well will be worth waiting

  • At 12 September 2014, 18:15:00 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @george click on the worklog tab, you will find everything there

  • At 11 September 2014, 20:03:09 user george wrote:   [reply @ george]
    • Did you finish it? Where are the plans? How does it work?

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