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Пікірлер
@monstereat90 Күн 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 9 күн бұрын
Very nice
@dominikworkshop6007 8 күн бұрын
Thank you!
@sergioalejandrogonzalez9755 14 күн бұрын
Terrific good looking DIY project, really neat. Congrats and thank you for sharing.
@dominikworkshop6007 14 күн бұрын
Thank you!
@lmwlmw4468 Ай бұрын
Great work...!!!
@dominikworkshop6007 Ай бұрын
Thank you!
@Sebasaper 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 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 Ай бұрын
Amazing!
@stuchump6618 Ай бұрын
excellent job. You should have more views and subs. Keep up the great work
@dominikworkshop6007 Ай бұрын
Thank you!!!
@avmusic7525 Ай бұрын
There is no BOM file in github, sir
@Mattia-os2qz 2 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 2 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 2 ай бұрын
Please make a video about 16bit adc voltage current measurement..
@user-cc8zj8gf4v 2 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 2 ай бұрын
Thank you! What exactly do you want me to explain in more details? What probelms do you have?
@raghavendramayya9902 2 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 2 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 3 ай бұрын
This design is Good Stuff , and what is needed for every bench supply considering it is a Linear supply ! Well done…..
@dominikworkshop6007 3 ай бұрын
Thank you!!!
@oldgerman 3 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 3 ай бұрын
Thank you!
@siedshojaat4473 3 ай бұрын
Is this power supply designed to short circuit the outputs or is it just a current limiter?
@dominikworkshop6007 3 ай бұрын
It can limit the output current, but it's designed so that it's should survive a short on the output.
@anl960 3 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!
@dominikworkshop6007 3 ай бұрын
Thank you!!! I don't have to calibrate each mosfet seperately. The op-amps ensure that the current is very evenly distributed. I used 4 resistors to sum the voltage on shunts, but it turned out unnecesary (maybe except for when there could be some hardware failure), because the op-amps are so precise, that the voltage on shunts is pretty much identical. Hope I managed to clear this out.
@siedshojaat4473 3 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 3 ай бұрын
Thank you, I'm glad you like it. The op-amps are powered with 15V coming from the emitter of T2.
@siedshojaat4473 3 ай бұрын
Is it possible to add the floating ground part to this circuit?@@dominikworkshop6007
@dominikworkshop6007 3 ай бұрын
@@siedshojaat4473I'm sorry, I don't understand your question.
@siedshojaat4473 3 ай бұрын
The floating ground is used in the laboratory power supply to parallel the sources or create negative voltages@@dominikworkshop6007
@dominikworkshop6007 3 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 3 ай бұрын
t4 and t5 dont have a reference, can you please be more specific about what should i use?
@dominikworkshop6007 3 ай бұрын
They can be just a generic medium power transistors. You could use bc639
@grahamhall2662 3 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 3 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 4 ай бұрын
Very nice, I love it!
@marecek19891989 4 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 4 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 4 ай бұрын
@@dominikworkshop6007 Thank you. I´ll try it.
@marecek19891989 4 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 4 ай бұрын
@@marecek19891989 I used platformio to upload the code. There are many tutorials on KZfaq. 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 3 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 4 ай бұрын
Can i have the gerber for current updated main pcb? I dont use eagle, so i dont know how to export gerber.
@dominikworkshop6007 4 ай бұрын
There is a gerber file on my github repository. There were no major PCB changes, and this gerber file is the most recent version of the main PCB.
@arnopfuetzenreiter9536 4 ай бұрын
👍👍
@testeraccount5871 4 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 4 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 5 ай бұрын
Defiantly gonna build one of this! Great work! Thank you for sharing.
@dominikworkshop6007 5 ай бұрын
Thank you, and good luck with your build!
@paulversteeg8581 5 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.
@dominikworkshop6007 5 ай бұрын
Thank you, I'm glad to hear that!
@MiroslavHatina-xi2jl 5 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
@dominikworkshop6007 5 ай бұрын
You are right, thank you for pointing it out. I haven't used the input trigger yet, and there is an error in defines.hh, where I defined this pin to pin 3, instead of A7. The two pins I know can work as external interrupts were used for the ENCODER_A and ENCODER_BUTTON signals. I'm not sure if I will be able to configure the A7 input as external interrupt, but in that situation I planned to just check the state of this pin frequently, and act accordingly. I know it's not perfect, but the uC used in this load has some limitations. If I were to make a V2 of this project, I would probably base it on some STM32 uC.
@MiroslavHatina-xi2jl 5 ай бұрын
@@dominikworkshop6007 Maybe the PB3 pin can be used on the current system, which is still unused. It's a keyboard spare pin and MOSI too. And there is PCINT3 attached.
@ivojanssens221 5 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 5 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 5 ай бұрын
Amazing work. Thanks a lot for share it
@dominikworkshop6007 5 ай бұрын
Thank you!
@adriansmith31 5 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 5 ай бұрын
Thank you!!!
@fabiolourenco1827 5 ай бұрын
You've earned yourself a subscriber! Great Job!
@dominikworkshop6007 5 ай бұрын
Thank you!!!
@sotimmy3784 6 ай бұрын
What is the maximum current at 12v?? 8A too?? or 25A??
@dominikworkshop6007 5 ай бұрын
It would still be 8A.
@DheerajSinghal01 6 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 5 ай бұрын
Thank you! I get your point, though that would make this project a little bit more expensive.
@asifehsan4948 6 ай бұрын
Awesome project, I love it ❤❤❤
@dominikworkshop6007 6 ай бұрын
Thank you!!! :D
@milanm5776 6 ай бұрын
Dave Jones inspired?
@dominikworkshop6007 6 ай бұрын
Nope.
@Optimuseq 6 ай бұрын
Jakaś seria z cyklu "Jak projektować układy elektroniczne"? Zwłaszcza w 3D :)
@dominikworkshop6007 6 ай бұрын
Może w przyszłości kiedy będę mieć wiecej czasu o tym pomyślę ;)
@Optimuseq 6 ай бұрын
@@dominikworkshop6007 spoko dzięki za odpowiedź 👍
@fondueeundof3351 7 ай бұрын
Exactly what I was looking for! Thank you!
@SKElectronics 7 ай бұрын
I will start making it too soon.
@AldoSchmedack 7 ай бұрын
Ripple and noise? Harmonics? Love a follow up on a scope into various loads.
@dominikworkshop6007 7 ай бұрын
The measurements are on github repository: github.com/Dominik-Workshop/Linear_power_supply/blob/main/measurements.pdf
@yt4krist0f 7 ай бұрын
Great work!
@dominikworkshop6007 7 ай бұрын
Thank you!!!
@swake0019 7 ай бұрын
Very clean! It has the looks of a finished product. It actually looks better than some pre-production devices I have seen, let alone prototypes. Cost conscious choice of components too.Taking into account the limited possibilities of the LCD screen and buttons the user interface seems intuitive and quick in its use. You could add a menu with settings memories and also a constant voltage mode. For protection of both the load and the device under test you could also include overvoltage, overcurrent and overpower monitoring that can switch of the load automatically. Do you plan to add a possibility to manage the load remotely for more complex scenario's? For example with the application Test Controller? How 'fast' is it and how precise is it with very low currents? The use case I think about is simulating devices that have sleep time followed by sudden short wake-ups with peak consumption (think bluetooth, lora, wifi, etc... based sensors, smartwatch, wireless headphones and many more. Would be nice to be able to simulate such a device to test batteries or solar power/charger/battery combinations.
@dominikworkshop6007 7 ай бұрын
Thank you, that's very nice to hear! There is power motoring that makes sure it stays bellow 300W, and there's also overtemperature protection, that turns the load off if the heastink reaches certain temperature. I didn't plan on adding remote controll for this device, because I don't see a need for that. Maybe I'm wrong? It can switch currents fairly fast, though I haven't recorded any measuremets of that yet. It can go down to around 4mA and I guess it would fit the application of simulating devices that you mentioned. If minimum of 4mA isn't enough, this project could be easily modified to operate with smaller currents. This would of course come at a cost of smaller current range.
@bascomnextion5639 7 ай бұрын
You may want to look at the INA228 it contains all the hardware needed to measure current and voltage plus it calculates power , energy and charge with high accuracy or for a pre built unit the Junctek KL140F saves having to write software to do it and they contain 20 & 24 bit adc's which alone would cost more than these devices.
@dominikworkshop6007 7 ай бұрын
Thank you for the suggestion! This IC seems great, though I must say that the ADS1115 does the job and is a bit cheaper.
@bascomnextion5639 7 ай бұрын
The ADS1115 may be cheaper but it is only an ADC the INA228 calculates the current , power , watts , battery capacity , watt hours to a high accuracy no calculations are needed in your own code @@dominikworkshop6007
@sadeghmollaii9873 7 ай бұрын
Awesome
@dominikworkshop6007 7 ай бұрын
Thank you!
@neteagle2k9 7 ай бұрын
Wow, very nice project, the final construction is gorgeous. What is the cost of the enclosure ? Thanks
@dominikworkshop6007 7 ай бұрын
Thank you! I don't know the cost of the enclosure, since I had it manufactured for free.
@giorgostexnikos6976 7 ай бұрын
very nice build
@dominikworkshop6007 7 ай бұрын
Thank you!!
@megason007 7 ай бұрын
Fajne
@lovrinjo6783 7 ай бұрын
What power mosfets are you using?
@dominikworkshop6007 7 ай бұрын
IRFP250
@paulcohen1555 7 ай бұрын
Very nice! I will watch for advancement of the product. Until now, this is the BEST DIY LOAD which I found.
@dominikworkshop6007 7 ай бұрын
Thank you, I'm glad to hear that!
@pauldery7875 7 ай бұрын
Beautiful workmanship
@dominikworkshop6007 7 ай бұрын
Thank you!!!
@patrickbyron609 7 ай бұрын
Hi Dominik, your project is exactly what i need " Linear power supply" that can deliver my requirement of 24V 10A. Are there any updates / new developments, between your clip date till now ?.
@dominikworkshop6007 7 ай бұрын
The only thing I was trying, was to increase the stability of this design. In simulation I figured out, that replacing the Q1 MOSFET with an PNP BJT improved the stability, though I haven't tested it in real life. For someone that has some experience with electronics I recommend to try this modification and check if the stability improved. In addition to that, I'd like to mention two easy performace improving mods - using some precision voltage references (e.g. TL431) instead of two 7805s. And I don't recommend using a switching converter for the fans, because it introduces some high frequency noise to the output.