Dominik Workshop

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@OmarElmasry1 5 күн бұрын

this is a really good video thanks a lot

@dominikworkshop6007 5 күн бұрын

@@OmarElmasry1 Thanks, I'm glad you enjoyed it!

@rompipelotas 10 күн бұрын

i cannot find the schematics...????

@dominikworkshop6007 10 күн бұрын

github.com/Dominik-Workshop/Electronic_load/tree/master/pcb/pcb_main

@rompipelotas 10 күн бұрын

@@dominikworkshop6007 THANKS !!!!

@MarcelHuguenin 13 күн бұрын

Beautiful design and functionality.

@dominikworkshop6007 13 күн бұрын

Thank you!!!

@qbas060 19 күн бұрын

Hi, I've been working on my own load for testing Li-Ion/Li-Po battery packs for a while now and your project caught my eye. I would like to use some of the solutions but I am very curious why the LM4140 reference voltage circuit is used? Basically it only supplies the DAC, but there is a huge voltage divider at the output: 10k/560R. So the voltage range going into the amplifier is only 0-217mV? Am I understanding this correctly? I wonder what the point of this is, as the voltage in the amplifier is boosted back up to a maximum of 5V

@dominikworkshop6007 19 күн бұрын

Hello! The LM4140 was chosen for its outstanding stability, particularly due to its low temperature coefficient. Since the DAC's output depends on the supply voltage, ensuring a very stable reference voltage is crucial for consistent performance. The DAC needs to operate within a supply voltage range of 2.7V to 5.5V, which necessitates using a voltage divider to limit the output voltage range, as you correctly observed. The reason for setting the output voltage range to 0-217mV is that this reference voltage is compared with the voltage across the 0.1 ohm shunt resistor. When the reference voltage on the non-inverting input of the U1 amplifier reaches 217mV, the corresponding current through the shunt resistor would be 2.17A (for one power stage, there are 4 of these in parralel). Hope it clears things up, and that I understood your question correctly.

@qbas060 16 күн бұрын

@@dominikworkshop6007 That is exactly what I meant and thanks for the reply. I've done some simulations and with your explanation and the schematic provided (and some information from SW) I will use a very similar mosfet gate control. Your projects are brilliant, keep up the good work.

@grzesiek1x 20 күн бұрын

So the 5 V regultors are for voltage reference for opamps right? What about stability of the outpout with a big load? How much your outpout voltage drop let's say at 2 amps current for example?

@dominikworkshop6007 19 күн бұрын

Yes, the 5V regulators are currently used as voltage references for the op-amps. However, this is not the most optimal design choice. Using a dedicated voltage reference like the TL431 could provide better precision and stability. After replacing the P-MOSFET with a BJT, the output has shown stability even under heavy loads. More details on this change can be found in the README file on the GitHub repository. While I haven't precisely measured the output voltage drop at a 2A load, I estimate it to be less than 10mV. As demonstrated in the video at the 5:39 mark, there's no noticeable drop in output voltage even at a 3A load.

@grzesiek1x 19 күн бұрын

10 mV is very good as with common l317 and simple design it can drift (at least in my case) about 180 mV or something in both ways which is quite annoying while charging LiPo batteries 🙄 I have to monitor the current all the time...

@samuelgift6889 26 күн бұрын

I found it difficult to understand the usage of opAmp but your schematic made me break the barrier. Although am not yet saturated with opamp.. your project help so much

@dominikworkshop6007 26 күн бұрын

@@samuelgift6889 I'm glad to hear that!!!

@samuelgift6889 26 күн бұрын

Thanks you for sharing your work

@samuelgift6889 26 күн бұрын

Thanks

@eboy536 Ай бұрын

Great job 🎉

@dominikworkshop6007 Ай бұрын

@@eboy536 Thank you!

@stanislawi.4610 Ай бұрын

beautiful work

@dominikworkshop6007 Ай бұрын

@@stanislawi.4610 Thank you!

@monstereat90 Ай бұрын

hey, i have already see your github, wonderful work man👍. I want to ask some question, in your Electronic_load.txt file there is a component with the prefix name U$2, I search everywhere on your 3d models but i can't find it, can you tell what component is that?

@bflmpsvz870 Ай бұрын

Very nice

@dominikworkshop6007 Ай бұрын

Thank you!

@sergioalejandrogonzalez9755 2 ай бұрын

Terrific good looking DIY project, really neat. Congrats and thank you for sharing.

@dominikworkshop6007 2 ай бұрын

Thank you!

@lmwlmw4468 2 ай бұрын

Great work...!!!

@dominikworkshop6007 2 ай бұрын

Thank you!

@Sebasaper 2 ай бұрын

Mała uwaga dla budujących kupiłem tranzystory bc639 i nie działało po dokładnym sprawdzeniu okazało się że tranzystory mają inne wyprowadzenie Pętanie do was panowie czy można podwoić wszystko i zbudować zasilacz w kanałowy i ewentualnie łączyć kanały aby zwiększyć napięcie ? Czy będzie zwarnie przez Arduino jeśli tak jak to rozwiazać

@dominikworkshop6007 2 ай бұрын

Można zrobić wielokanałowy z możliwością łączenia szeregowo, ale tak jak piszesz, controll board by to zwierał. Rozwiązać to można by było stosując izolator I2C do przetwornika ADC, i mieć połączenie między płytkami tylko przez I2C. (zasilanie ADC też nie może być brane z controll boarda oczywiście)

@TS-hx4ts 3 ай бұрын

Amazing!

@stuchump6618 3 ай бұрын

excellent job. You should have more views and subs. Keep up the great work

@dominikworkshop6007 3 ай бұрын

Thank you!!!

@avmusic7525 3 ай бұрын

There is no BOM file in github, sir

@Mattia-os2qz 4 ай бұрын

Hi! Great video and amazing project, very interesting. I would like to ask you for an explanation: I struggle to understand the function of the P-channel mosfet and how it decreases/increases the output voltage

@dominikworkshop6007 3 ай бұрын

Thank you! When the voltage on the P-channel MOSFET's gate decreases, it starts conducting, thus increasing the output voltage.

@Shyamkumar-di5fu 4 ай бұрын

Please make a video about 16bit adc voltage current measurement..

@user-cc8zj8gf4v 4 ай бұрын

Good job thats a nice design! Can we get more details from the current limit circuit because im trying to build something similar and im having trouble

@dominikworkshop6007 4 ай бұрын

Thank you! What exactly do you want me to explain in more details? What probelms do you have?

@raghavendramayya9902 4 ай бұрын

Good Project, Can you explain how ADC is designed and working and explain working of electronics similar to your Power supply design explanation.

@dominikworkshop6007 4 ай бұрын

Thank you! I might do that in the future. It is very likely that there will appear some documentation on the github repository.

@packratswhatif.3990 4 ай бұрын

This design is Good Stuff , and what is needed for every bench supply considering it is a Linear supply ! Well done…..

@dominikworkshop6007 4 ай бұрын

Thank you!!!

@oldgerman 4 ай бұрын

Thank you for sharing. Your work uses basic circuits to achieve these functions. Even if the design lacks protection circuits, the project looks complete！

@dominikworkshop6007 4 ай бұрын

Thank you!

@siedshojaat4473 5 ай бұрын

Is this power supply designed to short circuit the outputs or is it just a current limiter?

@dominikworkshop6007 5 ай бұрын

It can limit the output current, but it's designed so that it's should survive a short on the output.

@anl960 5 ай бұрын

Hello Dominik, great work🎉. I do have a question for you. There is a labeled pin as “OFF” in the schematics. Since this pin is same in every mosfet and controlled by 1 output pin so how do you calibrate each mosfet seperately? Thanks!

@siedshojaat4473 5 ай бұрын

Hello, thank you for your good page and great movie Can I know how much is the power supply of the op-amps and where does it come from?

@dominikworkshop6007 5 ай бұрын

Thank you, I'm glad you like it. The op-amps are powered with 15V coming from the emitter of T2.

@siedshojaat4473 5 ай бұрын

Is it possible to add the floating ground part to this circuit?@@dominikworkshop6007

@dominikworkshop6007 5 ай бұрын

@@siedshojaat4473I'm sorry, I don't understand your question.

@siedshojaat4473 5 ай бұрын

The floating ground is used in the laboratory power supply to parallel the sources or create negative voltages@@dominikworkshop6007

@dominikworkshop6007 5 ай бұрын

@@siedshojaat4473 The output of this power supply is galvanically isolated from mains earth, so it is possible to for example, connect other power supply in series with this one

@HatsukoiShitsuren 5 ай бұрын

t4 and t5 dont have a reference, can you please be more specific about what should i use?

@dominikworkshop6007 5 ай бұрын

They can be just a generic medium power transistors. You could use bc639

@grahamhall2662 5 ай бұрын

Wow what a great project. Must be very satisfying to have designed and built it yourself. I love the mixture of old bits and new technology to construct your project of very competent construction. Wonderful well done, enjoy.

@dominikworkshop6007 5 ай бұрын

Thank you, I'm glad you like it! It is indeed a good feeling to build something yourself, but there is always something you wish to improve. Now I'm working on a second version of a linear power supply which hopefully will be more professional and easier to recreate.

@beppe3001 5 ай бұрын

Very nice, I love it!

@marecek19891989 6 ай бұрын

Very nice work. I would like to make one myself, but I don't know how to have a PCB made. Shouldn't you have one piece of PCB?

@dominikworkshop6007 6 ай бұрын

Thank you! Having a PCB made is very easy. There is a gerber file on my repository (link in the description). You just have to upload it to a PCB manufacturer, like JLCPCB, and order it.

@marecek19891989 6 ай бұрын

@@dominikworkshop6007 Thank you. I´ll try it.

@marecek19891989 6 ай бұрын

@@dominikworkshop6007The PCB is ordered now, we just have to wait until it arrives. What program is used to upload the code? I can't find the list of components, maybe I don't have the right programs. Sorry for the questions, I'm a beginner, thank you very much

@dominikworkshop6007 6 ай бұрын

@@marecek19891989 I used platformio to upload the code. There are many tutorials on KZbin. There is a pdf with full schematic on my repository. You could also open this project in Eagle to be able to inspect what goes where more easily. Let me know how this project is going for you!

@marecek19891989 5 ай бұрын

@@dominikworkshop6007 Hi, my project has progressed. The PCB arrived from China looks very good. I am ordering components, but it is very difficult here in Slovakia. I can't buy measuring resistors :( where did you get them? Thank you

@ajaybnl 6 ай бұрын

Can i have the gerber for current updated main pcb? I dont use eagle, so i dont know how to export gerber.

@arnopfuetzenreiter9536 6 ай бұрын

👍👍

@testeraccount5871 6 ай бұрын

Can resistors R4, R5, R9, R10, R14, R15, R19, R20 be replaced with 0.5ohm resistors?, or can they be replaced with other types of resistors that are easier to find? Thanks sir!

@dominikworkshop6007 6 ай бұрын

Yes, they can be replaced with 0,5 ohm resistors, but that would mean more power loss on these resistors, unless the maximum current is reduced. They can certainly be replaced with other types of resistor, but I suggest ensuring that they have low thermal coefficient.

@fabiolourenco1827 6 ай бұрын

Defiantly gonna build one of this! Great work! Thank you for sharing.

@paulversteeg8581 6 ай бұрын

Very well done, especially the software is first class. It would be nice if you would reference the originator, John Scully more prominently. It's good to see that you fixed all the hardware issues that plagued his incemental design.

@MiroslavHatina-xi2jl 6 ай бұрын

Did you use an input trigger? I mean define in defines.hh is wrong. It corresponds to ENCODER_BUTTON and the signal input trigger is connected to pin A7 on the PCB. It's just an analog input. Has it ever been tried? Miroslav

@ivojanssens221 6 ай бұрын

I love these DIY PS. Nice done 👍. A long time ago... 30 years or so... I also made a DIY power supply. I used a motor-controlled variac as the input voltage, to minimise the dissipated power. The voltage across the control transistors is constant (automatically controlled via the motor) so also the dissipated power of the transistors is constant regardless of the output voltage. So in addition, I also had a 4A 0-280VAC, 40A 0-25VAC, 20A 0-50VAC and stabilised 40A 0-25VDC or 20A 0-50 VDC. Made my own current measuring resistor (hand wound resistor) for the sake of the 40A. DC was with adjustable current limit. Now it's in the basement and is nothing more than an anchor... (Oh how heavy that thing is 😂)

@dominikworkshop6007 6 ай бұрын

Thank you! That sounds like a great solution (ignoring the immense weight I can only imagine it had xD)! I wander how it reacted when the output voltage changed rapidly, especially when it goes up. I guess that the motor-controlled variac didn't adjust very fast (or did it?). I see that this problem would be ocurring especially in the constant current mode, when the load rapidly decreases. Or maybe it's not a big deal and the power supply handled it well?

@temyraverdana6421 7 ай бұрын

Amazing work. Thanks a lot for share it

@dominikworkshop6007 7 ай бұрын

Thank you!

@adriansmith31 7 ай бұрын

Very nicely done and well explained. The PCB is well designed and looks as good as something that would cost hundreds. Thanks!

@dominikworkshop6007 7 ай бұрын

Thank you!!!

@fabiolourenco1827 7 ай бұрын

You've earned yourself a subscriber! Great Job!

@dominikworkshop6007 7 ай бұрын

Thank you!!!

@sotimmy3784 7 ай бұрын

What is the maximum current at 12v?? 8A too?? or 25A??

@DheerajSinghal01 7 ай бұрын

Amazing project However, I separate display for measure value will be helpful. A diff display to select the modes will make it much more user friendly

@dominikworkshop6007 7 ай бұрын

Thank you! I get your point, though that would make this project a little bit more expensive.