DIY Lab Bench Power Supply From an Old ATX Computer Supply
ฝัง
- เผยแพร่เมื่อ 17 พ.ค. 2024
- You can find the 3D models and links to all of the parts down here
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Links (affiliate)
-Parts I used:
ATX supply can be found locally.
Load resistors: s.click.aliexpress.com/e/_DCb...
Voltmeter / ammeter displays: s.click.aliexpress.com/e/_DeE...
Binding Posts: s.click.aliexpress.com/e/_Dk1...
Fuse Holders: s.click.aliexpress.com/e/_Dd0...
10A Fuses: s.click.aliexpress.com/e/_Dmq...
Push button switches: s.click.aliexpress.com/e/_De4...
USB Charger: s.click.aliexpress.com/e/_DdP...
12V 40mm fans: s.click.aliexpress.com/e/_Dmm...
5mm LEDs: s.click.aliexpress.com/e/_Dll...
5mm LED panel mount holder: s.click.aliexpress.com/e/_Dlj...
Resistors: s.click.aliexpress.com/e/_DD5...
AC Inlet Socket: s.click.aliexpress.com/e/_DeB...
P channel MOSFETs: s.click.aliexpress.com/e/_DEg...
N channel MOSFETs: s.click.aliexpress.com/e/_Dde...
M3x12mm hex bolts: s.click.aliexpress.com/e/_DFA...
M3x5 Inserts: s.click.aliexpress.com/e/_DDm...
M3 nuts: s.click.aliexpress.com/e/_Dkh...
-Some of the tools/supplies I have and really like:
TS100 soldering iron: s.click.aliexpress.com/e/_DER...
My favorite soldering tip (TS-BC2): s.click.aliexpress.com/e/_DCG...
Tip cleaner: s.click.aliexpress.com/e/_DEi...
Solder pump: s.click.aliexpress.com/e/_Dk1...
Super cool multimeter probes: s.click.aliexpress.com/e/_DEe...
Screwdriver set: s.click.aliexpress.com/e/_DcQ...
Electric screwdriver: s.click.aliexpress.com/e/_Dda...
Deburring tool: s.click.aliexpress.com/e/_DBt...
Hand drill: s.click.aliexpress.com/e/_DmC...
Silicone wires kit: s.click.aliexpress.com/e/_DBG...
Black hot glue: s.click.aliexpress.com/e/_DlU...
12AWG wire: s.click.aliexpress.com/e/_Dkc...
Heatshrink: s.click.aliexpress.com/e/_DB3...
3D Models:
Thingiverse: www.thingiverse.com/thing:608...
Printables: www.printables.com/model/5084...
Thank you for posting such a nice video. Your unit looks professional and quite versatile. There is one issue you should consider. When converting a computer power supply such as this, consider that the ground on most PC power supplies are internally connected to the AC power ground. If by chance you have another piece of AC powered test equipment such as an oscilloscope (they have the same issue with the ground), connecting test leads to the wrong place could cause something to go 'poof' or worse. You may want to consider, if you have the room inside the case, to install an isolation transformer. Or at least use one externally.
Thanks! About isolation, just as you said, I had a problem the other day. I connected a VESC controller to a 42V power supply that wasn't isolated because I didn't have a battery on hand aaaand when I connected the VESC to my PC over USB, the USB hub died together with a couple receivers for my barcode scanner and keyboards
I took a look at some isolation transformers for 240VAC but they are all over 100 Euros which is too expensive for such a project. I'll do some more research hoping I find something better
@@Djambo57 you can make your own with a couple transformers, they must be same.
Neat build up, just an FYI, you need to remember that an ATX PSU is a switching PSU, the output is by no means clean there is a lot of noise on the output. If you want to design or repair I would suggest you rather build a linear lab bench supply, there is a reason these supplies are STILL used, especially in a repair and design environment. For a simple and dirty supply yes you can do this, but, I would not suggest this for repair and design.
Yeah, and since I removed its case which is a shield it probably isn't a good idea to use it in a professional way. With that being said, this project was aimed at beginners, who are just starting out. Playing with LEDs, small motors, and similar stuff.
It should do a good job for such things and I'm still using it to power simple stuff. When I quickly need to test a proximity sensor, for example, it's neat to have both 3V3 and 5V rails always there, always on
@@Djambo57 Yes, for sure. I am sure it would be a good stating point for the beginner, I just wish that content creators would state this though, SMPS's are great at delivering a decent amount of current in a small package, it is just not always the cleanest. FYI, another tip, is to put a choke and another cap just ahead of the output terminals something like a 220uf cap and an appropriately rated choke for the current further cleans it up.....
I like the video because you managed to make it really small in size and I know it could be upgraded, but I also understand that this is like a supplementary power supply and then there is no point in wasting money because it would cost too much. In this way, it is functional and serves exactly what it was designed for. I use them too and they come in handy for various projects.
Very nice build, I'll have to try and make one. Thank you for the video.
Thanks!
I have to say that you did an amazing design on the case. It's not just a square box. LOL
It looks very pro.
Thank you :D I wanted to make it a bit special so I spent some extra time modeling
Very professional build and presentation !! Power Supply looks fantastic !!
Great video with very good explanations on how you did everything! I am definitely a subscriber from now on.
Thank you so much! :)
Same here, this is the best I have found so far
I was wondering before i start this project, what are the dimensions of the enclosure?
And what is the Yellow binding post used for?
thank you
one limit of this is that you can't tie your grounds of different voltages together, so if you have a circuit that needs 3.3v and 5v, it won't fly.
You can't tie the grounds together because the volt-amp displays have to be between the load and ground, not the supply and ground. If you do tie them, your current readings will be wrong.
I ran into this myself. My solution was to get some hall-effect current sensors and use an arduino to fake an analog output to the current measuring part of the circuit. Never got it quite calibrated though, other projects came up.
One thing that worries me is 3v3 switching. It can be that 3.3v for Vgs is not enough to fully turn it on so with hi current it can cause some heating problems. Recommend to check used mosfet Vds to Id diagram with 3.3v Vgs and use it to adjust fuse size.
Cool build! I kinda want to build one after I watch this video. If I am building this, I will probably use a relay to switch the power and a single ULN2003 for handling the LEDs.
ULN2003 looks really interesting for this case, I haven't heard about it yet but I'll definitely look more into it. Thanks :D
Nice project, the only thing I don't agree with is the positioning of the fans. In my opinion, all 3 fans should be positioned on the side where there are now 2 of them (throwing out air) while on the side where you placed one, create a grill large enough to let in the same amount of air that goes out. With this configuration, the hot air present inside is expelled by the fans and replaced by the fresh air that arrives from the grill.
Wow this is amazing - really well made video and project! You deserve so much more views. Keep it up because you got talent my friend.
Thank you :D
one usefull think i havent seen here is over current protection. i know you have fuses, but 10Amps can kill a lot of hardware anyway, so a ;)n active one sometime saves a day. (well it did for me, meny times;) )
Your lab bench atx psu might be the best one Ive seen. I'm thinking of doing the same but I read online that ATX psus arent current limited. If I wanted 12V at 0.5 amps will it be possible or will I end up frying pcbs?
Thanks! They are not current limited but you can find some DC-DC converters on Aliexpress which can help you regulate both voltage and current. I'll be doing another power supply video soon and I'll be adding such a module so make sure to stick around :)
I love this. Could it be made wider to include +24V and maybe a variable module?
You’d prolly want a buck boost converter. There’s a -12V line but it’s only got half and amp and thus is a bad idea to tap into. Unless you want to power an op amp or something simple like that I’d recommend against it.
What a fantastic video ,i kind of enjoy the pro presentation ,if it's okay with you ,will you kindly send me the schematic diagram please , need to do a project using that Lab bench power supply
Maybe I missed it, but is there a schematic somewhere?
Can you do a workshop and lab tour of yours, Please 🥺🥺. Also is it important to print the bezzel in TPU or it can be printed in PLA ?
Hey, the workshop is still not finished... I still need to get some tools like a microscope and an oscilloscope. I don't want to make a video about it until it's 100% how I want it to be, but when it gets there, definitely! For the parts, I left around 0.2mm tolerance if I remember right so it could be printed with PLA, but I'm not 100% sure :)
+1 for the workshop and lab tour
I was having an idea that smd rework station has an adjusting knob for fan and temp control
It delivers voltage upto 24 v
And the pcb in it can handle a descent wattage consumed by heating element of heat gun and soldering iron
Why can't we use it to make variable bench power supply
If you can make one
It is a new design no one has ever done
I hope you will find it interesting
The idea is instead of heat gun handle we can use female banana clips
The temp meter can be replaced by volt amp meter
We will get two connections
1 soldering station
For low power equipment
2 heat gun connection
For more power
Nice
Thanks :)
Looks great!
Thank you :)
I see the schematic for the mosfets in the video. In your video it looks like you are connecting two of the legs of the P channel mosfets together. Is that just an illusion, or are you really doing that? It would be nice to see a bit more detail on the connection of these :) Maybe a link to the schematic at least. Thanks for the video.
Just follow the schematic it is correct. I remember connecting something wrong while recording because the camera was in a way and it wasn't comfortable to solder like I usually do 😁
Thanks for this video. Decent PSUs are so expensive, why not make a project out of it eh. Was just wondering what 3D printer you use?
Printed on Prusa MK3s
⚠ Hi Djambo. Is it not possible to make a "standard" ATX Lab power supply chassis that will fit more or less any ATX PSU (could be restricted to modern PSUs from a certain date only or other parameters) so that you simply can grab it (the Lab chassis) off the shelf and throw in a PSU and it will work❓
Hi! That would be possible, I like the idea
@@Djambo57 I'm sure you are the man to pull it off. I don't have the necessary skills. Oops.. maybe this idea should be kept secret lol.
Excellent! Although I would have added another adjustable option in volts and amps, or would remove the 3.3V to place the adjustable! You may make the modification for a next video.
Another thing that would be great is that you would include subtitles for other languages, for example Spanish. Greetings
Hey, thanks for the comment! I was thinking about adding something like the XYS3580 module so I can adjust the voltage and current but I decided to leave this one as a basic atx supply with some added features. I already have an adjustable PSU at my desk but I'll for sure make my own in the future! 3V3 is actually pretty useful in my case because most of the ICs work on 3v3 so I wouldn't leave it out... And for the subtitles, I'll take a look at it :)
hi there! Cool built! What is the yellow banana socket?
Hey, Thanks! The yellow socket is connected to the earth pin in the outlet. It may be used with an antistatic band and a current limiting resistor in series so you can hook yourself up to it while working with PCB so you don't damage something with electrostatic discharge
Nice bro... Continue good work.. ❤
Thank you :)
load resitor == Load Regulation or not? ,How to notice that already build in psu ,key word in datasheet please.
or it bleeder resistor ?
Dobar
👏👏👏
Looks really cool 👌Sorry for such a shallow comment 😉
Thanks :)
duuuddeee ur so underrated
Just started out, there's time to grow :D Thanks
Nice project, couple of suggestions. You do not really need to monitor the voltages for the different lines as they do not vary (much), that would simplify the project. A current meter is useful and this could be put on the 0V line as this line is common for all the different voltages (3.3, 5, 12, ...).
Thanks for the comment. I already built a couple of these before, without a custom enclosure or anything else but I wanted this one to be a bit more complicated. A beginner could learn a lot by building something like this. That's exactly how I got started with electronics, by building an unnecessarily complicated electric longboard.
I disagree on that!
One reason that most higher end power supplies do have a volt meter as well as the amp meter, is to monitor voltage so that IF a problem happens and the voltage on a line changes, if it doesn't burn things up, you'd see the problem before connecting something to it.
With power supplies, all it takes is a component or few to fail and cause a high voltage situation.
Every power supply I have has a volt meter (or more), including my professional digital, programmable Lab bench supply.
No way would I connect a project to a supply with knowing that the voltage is correct.
@@BlondieSL Yeah I feel safer when I can see the voltage reading all the time
Excellent.
Thank you :)
very cool Project.
but because my english is not so good... would it be possible for you to create a sketch where you can see again what needs to be connected where and how?
Hey, I'll make a schematic in a few days when I get some time and I'll leave a link to it in the description
@@Djambo57 thank you so much =)
Can you send me diagram ??
Your work looks amazing, and the case is very well-designed, but there is one problem. ATX power supplies work at high frequencies - without electromagnetic shielding (which is its own case), they cause significant amounts of interference in sensitive devices, like audio amplifiers - amplifier may hum or even (?) boost (idk how to say it, English is not my first language). The easiest solution for this problem is to install the original power supply with the original metal shield inside your case. Don't get me wrong, I appreciate your work, but you shouldn't use it, when professional hardware is needed.
BTW, if someone uses an old ATX, it's good to check the electrolytic capacitors. It may help with issues like turning off at random moments when it has to provide more power than usual.
You are 100% right but for an electornics beginner it shouldn't be a problem. Thanks! :D
Voltage is too low and too bulky. Should use laptop psu usually has 20v.
You used many screens, connectors and mosfets by connecting them to each voltage separately ... When u can just use a one volt/Amp screen plus one "Rotary Switch" ... Just connect the yellow wire from the screen to select the voltage ur working on 12, 5 and 3.3V ... LEDS i dont see why u need mosfets to control them, just one for stand by plus one for power on ... I built my power supply like that from 5 years back (plus i added a temperature control for the fan to work from 37c to 42c) .. BUT the important thing is that you had fun :)
I needed to have all outputs available at any time because sometimes I have stuff that needs multiple voltage rails to operate...
For the LEDs, I wanted them to shine with the same brightness, I didn't have any smaller MOSFETs or transistors so I had to use these large ones
@@Djambo57 In that case u are right .. keep the good job
Nice PSU u got there. I really like how it front panel looks, and your choice of elements to turn ATX into bench. I just don't get one thing. Why did you spend so much time creating this and leave it only 3, 5 and 12v, without adjustable voltage/current? there's enough room in the box for a module, and maybe if usb is on the side/top the screen and button of the module can be fitted on front panel. and it can get powered on from 12v rail
i rly don't see the point of making this, other than just out of passion and too much spare time. it looks really nice, but you can get pretty much the same effect if you just drill atx and add 4 terminals (3V,5V,12V, Ground)+fuses and find a way to live with urself without on/off and LEDs for each terminal.
If I am to build such a PSU myself again, prolly I'll use a significant part of your design, its inspirational :)
I wanted this supply to be a basic fixed one, I'll make an adjustable one in the future for sure!
The space inside the case was eaten up by the wires so I couldn't fit anything else even it I wanted to :/
It is the same thing if you made it by securing the bindings posts to the ATX supply's case but I wanted it to look like a finished product, that's my obsession with these projects :)
complexo
Di si đambo
It would have been easier to us relays
Didn't have any on hand :D
MANY problems
- such PSUs are very noisy - the waveform is terrible
- when they fail they can destroy the load
- no current limiting
- no short-circuit protection
- not recommended for capacitive or inductive loads
- very high current at 5V so a short in the load will fry everything
- NOT for the novice as there is a MAINS voltage subsection
I'd say they are fine for someone who's just figuring out how LEDs and resistors work. It's quite handy to test stuff like fans, etc. I maybe went too far with the enclosure, but I really like how it looks, and I use it almost every day
@@Djambo57 "I'd say they are fine for someone who's just figuring out how LEDs and resistors work. "
Congratulations, you're a moron!
Italiano? Ahahaha
no italiano!
All that work just to supply 3 fixed voltages.
I'm working on an adjustable supply at the moment :)
Ты русский?
Я хорват :)
I totally disagree that OLD ATX PSUS are 'fine'. They are much more likely to break down. And when they do they can destroy whatever they are powering
Most ATX PS breakdowns are cause by leaky electrolytic Caps. Replace them and you're good to go.
@@paules0099 have seen many more active parts fail than caps in ATX PSUs