DIY Lab Bench Power Supply
ฝัง
- เผยแพร่เมื่อ 21 ก.พ. 2014
- Twitter: / greatscottlab
Facebook: / greatscottlab
Previous video: • Electronic Basics #4: ...
More project info on Instructables: www.instructables.com/id/DIY-L...
Parts list (affiliate links):
Aliexpress:
5x Binding posts (red): s.click.aliexpress.com/e/_dZf...
1x Binding post (black): s.click.aliexpress.com/e/_dZf...
1x Toggle Switch: s.click.aliexpress.com/e/_d9d...
1x 3mm Green LED: s.click.aliexpress.com/e/_dT0...
1x 3mm Red LED: s.click.aliexpress.com/e/_dT0...
2x 220Ω Resistor: s.click.aliexpress.com/e/_dTP...
Shrinking tube: s.click.aliexpress.com/e/_dXH...
In this video I am going to show you how to convert an old ATX computer power supply into a powerful lab bench power supply with only some low priced parts and solder. Join me for this really useful build. - วิทยาศาสตร์และเทคโนโลยี
![[LIVE] : ONE ลุมพินี 66 วันนี้!! คู่เอก "ก้องชัย vs อัคราม"](http://i.ytimg.com/vi/j4uI5Uy8mWQ/mqdefault.jpg)
would be cool to have a remake of this video. You sound like you haven't had your morning cup of coffee yet. :P
whoa no need to get excited
yess
idk i kinda like the more chill Great Scott
Totally agree
@@camilomason4560 to ciekawe
This is great. I just built mine and it works perfectly. Thanks GreatScott!
Viwe Mqaqa i wonder if its powerful enough to jumpstart a truck
Meh. I use 50's Tesla BS 275. 0-800V
@@rosekreuze it will pop
Also, add 5-10A fuses
In case anyone is wondering like I was, if you have a gray wire, you can use that instead of the 2nd red wire he used on one of the LEDs. In this video he used a red wire for his LED, but you can use gray as well! Also the brown wire (3.3 sense), isn't necessarily always brown, it can be orange like mine was. Just look for the brown wire or orange wire that isn't grouped with the other orange wires, that would be your 3.3 sense. Just built mine today, I used crimping instead of soldering, and it's amazing! Very fun project to do! Vielen Dank!
I made this project, turned out really cool and it comes very handy to supply my 100w led with it's demanding Amperage
Current*
Maaan I was twanted to do this for over a year and today I finally did it! Amazing!
First time and everything works yeaaa it's a good feeling.
Watching your channel and yourself grow has been a privilege. You have come a long way keep up the good work mate! =D
Thanks
Johann Wyss Same
What a great video, today i finished my own ATX bench power supply, it turned out great. Thanks for this video :)
Thank you you show how easy this can be for us beginners.
Just build this and it works GREAT! Thanks for this!
Thanks! My first attempt at one....had to wait until the 5ohm resisters came in.....but works really well!!!
you always have wonder videos. I cant get enough
Thanks for the tutorial - just made one myself this afternoon using your guidance.
congratulations for your work, and thank you for share this information, excellent project
I am totally new to hobby electronics and this looks absolutely awesome!! Uh always wanted to get in the hobby my mother never let me though... Now I have a great journeyman who used to do it to learn from! And this is going to be a first true project for me! Thank you for the video!!! Learned allot from you!
Thanks for the great vid! Your video tutorial worked like a charm and a 15A ATX power supply now gives enough juice to run two lipo smart chargers :-)
I just built a power supply following (mostly) your video.
Danke.
BTW: My dummy-load resisters got very hot quickly (>50 C). But, I just stuck them to the metal box with some thermal paste. Now, the whole case is a heat sink for the resisters.
You must have the most "engineeresque" community on TH-cam. Subscribed. :)
You also get 24V between +12V & -12V. It's limited by current on -12V. And you can add LM317 variable voltage regulator on this output for best result and use.
@Lenin Pardo Salazar yes, I mentioned it...
@Abraham Pardo You can boost the current by changing the rectifier diode on the -12V rail. -12V is taken from 12V winding, it's just rectified in another polarity
That limits the current to 800mA... Seems booooring when you have 20 amps on the positive 12 volt rail.
got me one built! just finished it today :) thanks man!
Thank you so much for this! I wish I thought of this before. Power supplies sure are expensive. Thanks to you I will have two power supplies. You've got a new subscriber! :-)
I like the acid music..
Good tutorial also.
Great video. I hope to build one of these in the future.
What I did is I created a breakout box with the binding posts, fuses and an LED. It accepted a 20-pin connector - this way I can connect any ATX PSU to the box damaging it/cutting any cables :) Also the LED I used is green-red 2-color LED. I wired green to normal 5V rail and red to the standby 5V (always red on standby) via a single transistor and some resistors to the "power good" output - this way the LED is red on standby, green when ready and yellow when it switches on or the rails drift :)
I made one a few years back with your help thanks good channel
There is also a kit sold by Adafruit that outputs to 3.3, 5, or any other voltage from a barrel jack.
This is great, greatscott.
Cool video and idea thanks
would a 10w 5ohm resistor work well as a dummy load or do I need those exact ones? awesome video and thanks for any help!
Nice project
That was a great video. I've just started getting into electronics a couple of months ago and I've been looking for a cheap alternative to batteries. This is definitely something I'm gonna have to do in the future. Thanks for posting it.
A great video i now remember how to power my old one on again
Great work I saved 200 dollars cheers
Very cool :) Thanks for the upload
superb video
Hey great video. I`m going to build one of these by myself.
One question: Which binding posts exactly do you use? I couldn`t find statisfying once...
THX
Hello Scott. First of all, Congrats for the great channel, thanks for all your inspirationnal videos ! I am builind my power supply with the same principle, but I would like to have an ajustable Channel. I was thinking about wiring a +12 and a +5 of the PSU in series to get 17V and then adjust it with a transistor which I would command in PWM (arduino ...). Do you think that would be a good idea ? Thanks ! :) EDIT : Just realize my question was silly. You can't wire 12 and 5 in series cause that would mean shorting +5V or +12V to the GND !!!
This is essentially what I use since money is tight & electronics is just a hobby. 5V, 3.3V, & 12V are common enough voltages. I've been meaning to do some modifications to get other voltages out of it like 1.2-1.5 & 9, but I haven't gotten to it yet.
Hey great scott!! Its time to revisit this project and make it better. Or even diy vs buy?
Great job! Thanks 4sharing!
Oh this is an old video :') the feels
I am currently working on a power supply like this as an addition to my variable one
Thanks for this video! Also, what do I do with the tiny left wires? Gray, brown, black and jointed black and white? They are not the fans ones since the fans are already connected.
5 years later, thanks :) Couple of points:
- Green PS-On wire can be connected directly to the Ground, if you already have the switch on the side of PSU, as I did. One switch less.
- My 2 large capacitors are discharged automatically couple of seconds after i turn off the PSU. I've read that good design of good PSU has resistors on each capacitor to drain them. But short them with insulated screw-driver just to be sure.
- Soldering such thicc™ wires with 35W soldering iron is really hard. Almost a cold soldering. Better to split the wires in two and wrap them around your binding post, securing with nuts.
- My binding post inner core was all metal from the outside. Be sure to insulate it, otherwise it will touch the ground (case) and a short could appear.
- Take some really old PSU, preferably with a fan on the side, with more room inside. Chieftec had a huge fan on top, it took space inside, i had to be very careful with wires to fit everything.
You don't need to cut the wires etc. you can search on ebay for "Benchtop Power Board" or similar, you basically connect the 24 pin connector and there, you have a bench power supply with switch, ledy's and binding posts
I wish I read that earlier
dammnit..i didn't see this comment before i got stuff.
There's anything like that but with an integrated step-up step-down to obtain a variable output?
Beware of these cheap "Benchtop Power Board" from China/Hong Kong. Most of them either do not have fuses at all or the fuse is rated at 5A max which is way less than a PC psu can deliver, so you're limited on what you are going to power with it. Anyway, better be safe than sorry. Also some come with binding posts that are too small and will not accept a standard banana connector. Other than that they cost around $8 USD so for the money they are just OK.
great video
I was soldering over the internal components like you in 3:17. Then some solder dropped down on to the parts on the circuit board and i can't get rid of it anymore. :( So I recomment you to protect the power supply with a piece of paper. Mine is broken now...
The psu isn't broken, you've bridged something. Use Flux & copper braid /solder mop to mop up the solder. You'll need to resolder any parts you've moped up. Also you can place the psu down on the side being soldered.
Lastly solder cools in an instant, unless you use tissue paper it won't burn through.
F
You might want to use something a little more resistant to heat, like wood. Don't want to be the guy who starts a fire and really destroys their power supply :)
@@kingarthurthe5th "Use wood" " Don't start a fire" :P
Use a toothpick to remove the solder, of course heat it up before
+Jonas Offermann Martins and Michael Ding. Welcome to electronics Jonas! The small toggle switch is of a type which is single pole double throw.That means that it only interrupts or controls one leg of the supply, but it can, when needed have two active positions. In this application one terminal of the switch is not used because it is simply being used as an on/off switch. However if you wanted to switch the supply independently to different circuits at different times, then you would use all three terminals. Usually the centre one is common .Michael - a very good point. Perhaps putting some insulating sleeving over the threaded portion of the binding post where it passes through the metal casing would help.Saludos desde el chico electricista.
great videos!
Is it possible to put each wire to a separate post and then use various combinations of wires to achieve different intermediate voltages like 3v, 6v, 8v, 9v, 10v, 12v, 15v, 18v, 20v and so on by using two hot and one ground? Like stacking batteries of different voltages?
i made one myself but i used giant shrink tube and isolation tape to isolate it,and also added a lamp in the "suicide hole"to light up what i am working with(also has an on off switch)
Thank You, I have an SMPS. & I will do this . Can i use 4.7 ohm 5 watt Resistor
The Purple wire 5v SB 2amp is great if you have a clock or something you will always need on SB stands for Standby so even when you turn the power off the way you have it and the off switch is not directly after the mains in, it will stay on, awesome for my uses
thanks i hade no idea and run a second 5v power supply
That is cool!
cool project :)
Wonderful video! I'm surprised that I hadn't watched this one yet.
One question:
What are the other color wires for? +5V SB? PW-OK? Just curious! Considering converting one of my old power supplies into a lab-bench supply after I'm finished replicating your variable lab-bench power supply :) I just need to find the time in the coming weeks to convert the case on an old stereo....
+5V SB is 5v standby wire and it gives aoutput when pc is off
What if i put 12ohms to the 5v rail as dummy load,or 30ohms to the 12v rail as dummy load.and can i use this power supply to power arduino ?
You could also add a potentiometer and a voltage reader panel and you could use that as a variable supply
And can I use the voltages simultaneously to power up different devices in a circuit?
Big fan!
Would it be possible to create a power delivery usb charger out of a psu? And what would be the maximum pd volt and amp it can supply? I have a psu and i am thinking of creating a pd station to supply my dell laptop 130 watt, pi4 and two phones.
Great scott has gone from king of jank to eletrical engineer in these past years lol.
hey great Scott :)
sorry for late comment on the video, but do the load on the high power line is very important? can u pls explain little abt it?
Hi Scott, great video as always! I love you channel, thank you for sharing your knowledge so openly.
I have a question. I made my ATX bench, and all the outputs are ok, but with a slight instability in tension, like +/- 0.02 volts, and when I want to use it to power my servomotors (controlled by Arduino), this slight instability makes my servos jitter very hard.
Do you know what can be de cause and/or solution to this?
Thanks in advance everyone!
I red datasheet, and applied dummy load to all power rails : result was a bit more stable.. also those fancy white resistors are usually extremely hot and require a fan to operate well
How much heat will be dissipated from the dummy load if we run it for a long time? Does the dummy load need a heat sink?
I have a question: You were using a resistor for the supply that produces most current, for making it stable on the small load, so im guessing you need a current flow trought the wire to make a stable supply. how much load is needed for specific power supply?
Can you do anything with the 200v 600f capacitors that some power units have?
Does somebody know where i can get these connectors from? :D
Nice video! Thanks!
Question: What wattage were those 220ohm resistors? I was looking for some and I see 1/8, 1/4, 1/2, 1w ... I am not sure what ones I should be using. Thanks!
those are usually 1/4w
Really awesome ! :D
And where do I have to solder the resistors go? :O
Must I use the 5w 5 ohm resistors when I have more amps at 5 volts?
Or change only the output voltage?
I asked a similar question.... Did you find out???
Well now i have 2 lab power supplys for that kind of stuff.
But anyway good to know 5 years later. :'D
Hi great job! I think you forgot to add labels to the output posts to see which post delivers which voltage but other than that it is great thanks! ;-)
I just connected the PSU's fan into the 12v wire and it works fine.
Very nice power supply but only thing we can't get 6 and 9 volts which are also needed sometimes
I would use the 3V3 for the LEDs (and 15 ohm resistor)
Like you video. I tried to build one of these benchtop power supplies. My power good light keeps blinking. I get all the correct voltage I checked in twice. Can understand why the power good? Led keeps blinking. Yeah, only thing I didn't do is put. A dummy load on the 5 volt Rail. Could that be the problem?
Thanks good vid
You could pimp it up with a few volt ammeter things from eBay, maybe add a dial to adjust voltage or amps with a sepic or buck boost. Also I would have kept a few molex connectors and maybe a Sata.
Great Project! Is it possible for me to be able to Incorporate an arduino with LCD screen keypad and relays to switch between the voltages?
My power supply (Allied SL-275TFX) has 16 Amps on the 3.3V and 12 Amps on the 5V with a combined wattage of 110. The first +12V rail is 5 amps 60 watt. The second +12V rail is 13A 156 watts. Could I solder both +12V rails into one plug? What rail should the dummy load be on and what size resistor?
hello . i been watching your videos for a while now and i came across this one . can i use this to power t12 soldering iron kit ? please answer thanks .
i know i'm late on this, but confused on the 12V you doubled the 5w,5ohm to parrell them, so does that mean should take the 24ohm, 5W to 48/10 too?
I am using 2x 5.6Ohm 5 W Resistors, when I turn on the switch it only last for 2 secs and turns off. but the Power red Led is showing power on. Are the 2 Resistors not enough load for power supply to switch on and stay on?
Ich finde die Idee richtig super, weil es solche Netzteile schon für sehr wenig Geld gibt, und sich nicht jeder solch ein teures Labornetzteil leisten kann ( möchte ) .
Mine has 20A on the 5V side and 15A on the 3.3V side, and only 10A on the 12V side.
So i need to put the load on the 3.3V/5V side, right??
Hi there I just made this although my 12V shows 5.25V and 3.3V and 5V show 1.97V. I hope the PSU is not beyond saving! Any idea what is causing this please? GREAT CHANNEL LOVE IT!! BTW
i created mine with 8 terminals (3x GND), ok, led and iluminated switch... while closing it was like packing full suitcase before vacation :D
Mine attach a buck & boost converter to 1 of 12v wires, attach a mini av meter, change the trimpot to potensiometer, and ended it on a binding post.
Got a 12, 5, 3.3 and variable voltage output
i saw ur video of building a remote for the speaker system...can u made 2 speakers bluetooth or wireless from the woofer so that wires of speaker from woofer dont need????
I like the video. OK, ATX-PSU conversions may be an old hat, but the video is well made and edited. Way better then some bad recorded videos in 480p with sound that makes the ears bleeding.... :)
Do we need to connect all of the red wires to the +5 binding post, or will one red wire suffice?
@greatscott can you please make a video to control the output amp of any supply? Just like a addon to any supply that can adjust the amp just like its done in actuall bench power supply. I want same working schematic with much simpler construction.
Hey there,
Its very difficult to find a power resistor required to start the atx. So can I attach a high ohm resistor so that even the thin resistor can handle the current?
Maybe you should use the gray power_ok cable to power your green led?
also mention that you will fry your circuit if something goes wrong since these psu's deliver tons of amps :)
i have a bench powersupply and use a atx-powersupply for additional voltages if needed, but i have connected switchable polyfuses to each connector so that i can get a 200mA, 2A or unfused current.
0:58
Didn't expect the blue light!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
wonderful *
Super!
for what is the resistor at the 5v or 12v?
Scott, mostre-nos como montar uma fonte deste tipo, simétrica, para amplificadores. Eu estava pensando em fazer uma com Arduino, mas é um projeto audacioso demais para um hobbista.
Um abraço direto do Brasil!
Sucesso!
Boa!
thanks or the great info.
oh wow, i messed up my old ATX supply just like you did, burning short wires with it heh
Nice! Go mains 220 50/60 hz isolated to 60 volts at 0 to 6 amps adj V adj current limiting. SMPS in small package.
Are any of these good for a dummy load on the 12v rail, were all my power is at. I have 2.7ohm 7W, 330ohm 7W, 2.7ohm 15W and 160ohm 15W
Please make a video regarding where all I can use this kind of bench power supply(ATx power supply )