• µSupply


    The µSupply is a compact Arduino compatible battery powered laboratory power supply.

    0-1A constant current limiting
    Load current display 40mA (10uA resolution), 80mA (20uA resolution), 160mA (40uA resolution), 320mA (80uA resolution), or 1A (1mA resolution)
    Optional Ethernet Interface
    Arduino programming compatible (emulates an Arduino pro)
    Powered from 2 x 18650 Lithium Ion cells.

    There have been a whole series of videos describing the project development and changes:
    Part 1
    Part 2
    Part 3
    Part 4
    Part 5
    Part 6
    Part 7
    Part 8
    Part 9
    Part 10
    Part 11
    Part 12

    Rev A Schematic
    Rev B Schematic
    Rev C Schematic

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      • Plazma

        So what about to finish the project?

      • conrad

        Hi Dave,

        Firstly Excellent Video Blogs, really enjoy them.

        Quick question, you made some big design changes between design B and Design C. I am interested in the changes to the opamps. why go from a TLC272 to a jelly bean part like the lm358? it not the a rail to rail ,Diff amp, or high precision as you mention in the first couple of video blogs on the psu.

        Also I am modifying the design a bit to accommodate 0-30V 0-3A as per a Bench psu. What would you recommend for a opamp to use. the LM358 is a bit close to the maximum voltage .

        • Peter Mulholland

          For a wider voltage range, it is not really feasible to have the opamp seeing the full voltage. Instead you use separate supply rails biased around the output of the main regulator. See the Mastech power supply schematics for example.

        • Sebastian Scholle

          Yeah. I agree. The LM358 used seems like a downgrade the 2-3mV Offset does drop the accuracy by a substantial sum. However the Sense circuit can compensate for that in software. So reduced price for more complexity. I think episode 12 will see a Rocket to Mars being built.

      • Scott Prescott

        I was wondering why Dave hasn’t finished this project. Have you hit a brick wall and stuck or just lacking the time ?

      • Scott Prescott

        On the Rev C board it shows the SCL SDA both going to 3.3 after the resistors leaving the display. I’m learning and was wondering if that was correct ?

        • Michael Waiblinger

          It is correct, as you have to pull up the SDA and SCL somewhere for I2C to work. Internal pullups tend to have the wrong impedance so sn external, say 1-10K resistor is the way to go.

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      • montreuil g2

        I do not know how to thank you enough for taking the time and effort to show us all this. You are a very generous person, a treasure for us beginner makers and electronic hobbyists. Thank you many, many times again,


      • Levi N

        I really would like to see this completed. There are some great possibilities with this that I would find useful.

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      • Jan

        I just watched the first 8 videos and now I am sad 🙁 Where is the rest?? But great project though

        • szafran

          There are more – check out playlists on Dave’s channel 🙂

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      • Renato Tavares

        Please finish that nice project… It’s the perfect power supply.

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      • David Sobków

        Current sense on OPAMPs show always ~1A if load is below 1A.
        On LTspice same thing :/

        • David Sobków

          I use lm258 is this reason ? Not rail to rail ?

          • andy

            I am seeing the same thing on a board based off this design. I also suspected not being rail to rail as a problem. Just wondering if you managed to solve this problem?

      • Jon

        Hi Dave,
        This looks a great bit of precision device. Any thoughts on releasing a budget version based on your prototype design e.g. Using potentiometer to set voltage and current. It would make a great beginners kit.

        Thank you for the great videos you post, they have really helped me with depression. They have got me back into electronics and have given me something to focus on.

      • Sebastian Scholle

        I think Dave was inspired by the many advanced Power Supply projects out there and gilded the lily maybe a bit much here.

      • Lance Cars

        Come on Dave Finish this power supply up. I want one!

      • Youssef Aly

        I made the analog one on a PCB, demonstrated in part 3. I used an LM350 instead of the LT3080 as it’s not available here and I don’t know any alternatives. Of course it begins at 1.25V but it’s no problem, it affects the current limit but not by much. I used the LM324 quad opamps, I think it makes it oscillate in current limiting mode. Current limiting shows as oscillations with about 10% duty cycle on the scope, not sure where that’s from. Great job Dave!

      • Jose Luis Camba

        I’m sorry, i do not speak english well.
        I am trying to follow the operation of this power supply, but I can not find the source. Available?
        Thank you

      • Dark Shenada

        How about using STM32F407 instead of WIZ820io + ATmega168A + MCP23008 + MCP4716 ?

        Pros: USB(USB SCPI + standard USB DFU) + Ethernet(SCPI over TCP) at lower BOM cost.
        Cons: Extra SW develop cost. (FreeRTOS or bare metal instead Arduino)

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