Fully Programmable Modular Bench Power Supply

The project is focused on creating a high-quality bench power supply that is modular in construction and easy to build for the DIY’er but will offer features more often found on professional equipment.


Part 1 – Project Overview
Part 2 – First Regulator Tests
Part 3 – A working regulator (with stability issues)
Part 4 – A working constant voltage, constant current regulator
Part 5 – Range and resolution calculations and tables
Part 6 – Current Affairs and Sensitivity
Part 7 – DAC Attack!
Part 8 – ADC meets DAC and some video to prove it!
Part 9 – Programming resolution achieved – and then some
Part 10 – First PCB and more improvements and circuit changes
Part 11 – Significant Design Changes for more Precision
Part 12 – The first PCB and Thermal Management
Part 13 – More design changes and measurements
Part 14 – Dynamic Response Improvements and Measurements


View the YouTube video playlist for the project


PSU Version 0.2

Pictures showing the first prototype build of the regulator circuit and numerous scope starches of the resultant instability and noise

PSU Version 0.4a

Photo's covering the development of the Bench PSU regulator described in Part 4

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3 thoughts on “Fully Programmable Modular Bench Power Supply

  1. Pingback: HP/Agilent E3631A Power Supply Teardown & Repair | gerrysweeney.com

  2. Hi Jerry,
    I am very much interested in your fully programmable modular bench power supply, what are the specs like max output voltage, max current, what is the cost of assembly? It’s just a hobby but I am impressed by what I saw.

    • Hi Max,

      I did not complete the PSU, I only got as far as Part 14, its on the list to continue. Check out the earlier parts on the blog, I spec’d out the ranges I was aiming for in the design. I did not really work to a budget in the end, it was more of an academic exercise for me to learn about DC regulator designs. Some of the parts are expensive, although you can sacrifice precision for cost quite easily. I should probably design a budget PSU because a lot of people ask me that question.


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