Small DIY Bench Power Supply


Introduction: Small DIY Bench Power Supply

About: Always loved electronics. I like to reuse parts or componets and I Love to be part of the Instructable community.
Here is a small video showing my latest project. It is a small bench power supply that can adjust with precision current or voltage.
It is the first time I use an aluminium enclosure, so I decided to engrave the labels and symbols. I use 10 turn wirewound potentiometers to be able to adjust the voltage or current with precision. I power it with a laptop charger, like the my Mini Adjustable power supply . This adjustable power supply is larger than the "Mini" I made, but it is a lot easier to use and has a few other advantages.  I will be posting an Instructable with detailed instructions of how I've made it.



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    29 Discussions


    2 years ago

    I just would like to make a note that

    Volt, Amp Metter is useless. I bought 5 of those and find out that when you adjust voltage lest say to 1 volt and increase voltage to 15 it show 13-14 volts so it go off by 1-2 volt. I would guess if you go to 30 volt the error would be even bigger.

    Hi, it seems to me that your power supply didn't hold output voltage when load is connected (output enabled). E.g. when you set output voltage to 10V without any load (or with OE switched to OFF) voltage drop significantly when you connect the load (or turn OE switch to ON). I thing this should be the basic feature of any LAB power supply - to hold output voltage.

    Hi i still say Newton your the best lots and lots of love for your help and projects.

    vim from the united kingdom

    Hey...... Newton thanks a million.

    Wow..... well good ill give it a go.



    Hi newton

    wow that would be loved by many.

    please let me know ones instructions are



    1 reply

    Very nice looking PSU. Any update to the creation of the instructable. I am working on one that will be Li-Ion battery powered with charger built in. Can't wait to see under the hood. Your work is so professional looking....

    1 reply

    Thank you very much. I'm working on the instructable right now, I hope to have it done in a few days.

    Hi below you said that you use a attiny85 to control the led's. How did you provide a correct vcc to the attiny85 when the input to tge lab supply is say 12 volts ?

    I am trying something similar to you. I also want the output switch to be a latch button so I can default to output off on power up.


    1 reply

    Hi there. Sorry for late reply.

    I used a voltage regulator to bring the power down to 5v. I'm working right now on the instructable, so hopefully it will be done in a few days.

    This is amazing. I can't wait for this instructable to be done. Thank you for your time and willingness to share!


    3 years ago

    Thanks for responding:)
    Sorry, I was kinda a jerk.
    I understand that you are busy I know that it takes a while to make a instructable.


    3 years ago

    He may have bailed because last comment on here was on June 16th, 2014. He probably has a new interest and is too busy. :(

    1 reply

    Hi Jhodso,

    I sent you a private message some time ago, did you received it? I'm sorry it is taking me so long. I'm very busy at the moment, but I will finish the instructable for sure, but when.... I don't know really.

    Thank you very much, I'll post an instructable with all the info and photos.

    OK, i wait; hopefully before the LM2596 becomes obsolete :))

    Just joking, the project is good for any module, now i am looking at XL4005 modules with a 5A rated current

    I know am a pest newton, but my parts have arrived please... please lets have the Unique build piccy, plans step by step guide.

    we hounour newton.