How to make selectable voltage power supply from computer CPU power supply DIY bench power supply
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- เผยแพร่เมื่อ 25 ส.ค. 2024
- Hi Guys here is the new project How to make selectable voltage power supply from computer CPU power supply DIY bench power supply from "Electrical and electronics projects" "E&EP" Channel it's very easy and at low investment now you can easily make your own just moving selecter to desire voltage here you have 3 in 1 Power Supply.
Take 6 Yellow wires,6 Black(GND) wires,4 Orange wires,4 Red wires and take Green one to power the supply.
Yellow wire gives 12V DC
Orange wire gives 3.3V DC
Red wire gives 5V DC
Green wire is for on/off by connecting to black one.
Black wires are Ground Negative wires.
NOTE : Discharge capacitors before attempting this and be very careful while making this unplug all power sources from AC socket and then make it thank you.The auther shall not be liable for any loss of property,loss of life if it comes to that.
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||***THANKS FOR WATCHING***||
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Good choice of colour, looks great! I like the video, but I find that the idea of using a selector to choose a voltage is limiting what can be done with such a powerful unit. The way this is built, you can only use one voltage at a time. If you do away with the selector(the most expensive part) and use more binding posts, you could bring out all the voltages. Not only can you choose which posts to use for a standard voltage requirement, you can also combine positive and/or negative voltage rails to get a multitude of other voltages. You can tap into more than one output to power multiple devices, lights, experiments, all simultaneously! ...And for less money. Anyway, that's the way I made mine. But, I must admit that I will probably use that colour on something soon. Cheers! ;-)
Yes you are right i really apreciate it, but i already had build that one so now i tried this one and share it with you guys. Thank You for giving me idea for further improvement :) Here is the link for Power Supply that i used in video :th-cam.com/video/vLcgOW7mujM/w-d-xo.html
Ah, yes. Very nice.
After watching this
video again, I realized
that in the demo you used only fans. And I can see now that using a rotary selector is more convenient for that purpose. ;-)
I agree. I made mine with a post for each voltage. Many projects require 3.3VDC on one rail and 5VDC on the other.
Nice video ;)
Now i feel dump for not thinking of that before with stacks of psu i have...
If i may ask can you use that as charger for 12v batteries? and what is the limit that it can endure? if so can that be done by any given psu?
thanks in advance for any reply
This is just what I need. I work with kids doing arduino projects, LED, project etc. I don't want them to mess with the voltages besides those given because they can ruin the projects. I will make an adjustable one like on his new video for myself however. Thanks. Oh and this is one of the projects we are doing as well. Maker Space !
the title should be "selectable voltage power supply"...not "adjustable voltage power supply"
Mang: are you teaching lang or appreciating this man's project and sharing it with us?. Grow up child.
Sorry but there is a HUGE difference. In fact I came here for a power supply that had variable voltage control, sadly that's not the case. Not going to dislike the video because of this, but it IS misleading in the electronics sense.
Noting the difference between "selectable" and "adjustable" does not make Mang a child. What makes you a child is the fact that you don't know that titling a video that wastes people's time is an issue. See you and I have goals that we would like to accomplish before we perish. Given that we don't know when that will be, that makes time the most expensive thing we have. So to waste someone's time means there may be a goal that they don't get to accomplish. Conclusion: language and use of words is highly important.
There you go, I have changed it.
You are correct, now tell us how your Hindi is. Do you know if English is this man's first language? Perhaps some consideration is appropriate. Your response could be more concise for someone who is as concerned about wasted time as you are.
I've watched a few of these conversions and have noticed a commonality. None of these guys have girlfriends or wives. How do I know? Because they aren't using a blow dryer to shrink the heat shrinks!
And/Or - because they have the time to pursue interesting and useful projects?
Since you know so much,where is your perfect video?. Big Mouth.
?
Love the paint job idea! I have modded a total of 4 PSUs and I have always thought that the flat grey, similar to a fuse panel, just looked awful. Since the PSUs are no longer hidden inside a PC, their appearance needed a little something to make them unique. When I saw your video I knew instantly what I wanted to do with my PSUs. I gutted them so that they were just a bare metal box. I then took them to a local powder-coating business where the boxes were sandblasted, prepped, powder-coated and baked. I chose a high gloss black. I then had vinyl graphics made at a local vinyl sign shop. The end result was just amazing! I know some people might think that I should just go out and buy a power supply after putting that much time and energy into modding a PSU, which are limited in what they can do. Well, I know the guy that works at the powder-coating place and I also know the vinyl graphics people, so my costs was extremely cheap. Aside from that, I just love working on these sort of projects. They are in expensive and loads of fun! Of course, as always, this is only if you know what you are doing.
Wow...clean that soldering iron tip! It's no wonder you had problems soldering it...
v comprehensive video ever seen...the material used much low costed and most important the post modern...simply a single d device...
thank you for sharing this. you have helped me use my old pc power supply instead of just throwing it away. thank you.
Nice project. Glad I saved my old computer tower. Being freshly retired, with finding your channel, and my limited knowledge....let's see what kind of trouble I can get myself into now!...lol
Good project. Ignore the negative comments. Keep up the good work. Good of you to share it with us.
Cool. Good job. That little horn thing was screamin. hehe.
Wow , Now that's what i call back yard electronics !
Nice, but another way, perhaps a more preferable way to do this is to install lugs for each of the voltages, and perhaps even more than one ground lug. It's nice in some cases to have access to more than one of the voltages at a time.
This could be very dangerous for people to try and copy. People need to know that, however unlikely it sounds, the energy stored in the capacitors is enough to kill you.
That heatsink your putting a switch right next to that could be at a higher voltage that the mains input voltage - and dangerous even when its discontented from the mains.
Generally people should not work inside a PC power supply -just run the low voltage wires to a new box with the switches in.
I am just talking about safely so the simplified explanation is the PSU has inside it the rectified mains voltage - the 2 big capacitors are at the PEAK mains voltage - and the mains you get is not always what your supplier says it is - a " 120 " supply can charge the capacitors to up to 180 vdc. A " 220/230 " supply can charge the capacitors to up to a max of 350 vdc. The energy stored in the capacitors is enough to kill you.
Although the danger is the same not all PC power supplies look the same inside and not much room for adding switches safely.
2 things SHOULD keep you alive. 1 the PSU SHOULD have bleeder resistors to bleed away the high voltage fairly quickly when it is unplugged but as the PSU works fine without them often resistors may not be on or functional. I have held a PSU when working for a manufacturer testing new ones and had several painful shocks.
2 the heatsink is normally isolated by a paper thin insulator -if that is not functional the PSU may still work OK but you don't want to risk your life on it ,especially if you just bent the shiny metal heatsink to get the switch in the box.
Kit Bullough, true on both points, Safety and room.
1) If people don't know what they are doing, they should not attempt these projects. That is rule #1 above all.
2) There certainly is not much room inside a PSU box for modifications. I would think that some people might move the guts of their PSUs into a larger project box which would allow for modifications to be made. Again, point #2 should only be done if the person knows what they are doing. If you know what you are doing then the sky is the limit to the projects you can do.
keeping some stuff like the sata power socket thingy and hdrive/dvd drive power sockets can come in handy along with a car cigerette lighter female socket is handy to have
Great idea with the 3way switch, I've made one before but with just 3 different plugs, your way is much neater.
Thanks for the vid..
Put some solder on the tip, helps a lot when soldering.
Very good! Now make a variable output!
Really great. :) Now you just need to write there "3.3v, 5v and 12v". :D
Thank You!
cloudy looking solder joint is called cold solder joint. which you soldered.
This is a awesome video. It seems very helpful to a person who has no idea on what to do.
mr.Kevin,the title is misleading especially for young kids starting on electronics,expecting an adjustable power supply of 1volt to 12volts for different school electronic projects..anyway,you win guys!..sorry for giving my opinion
Video well done. Never thought about painting one! Thanks!
that soldering iron tho, here's a way that I really like, scratch the tip with the back of a knife until u just see a copper like color on the tip, dip it in some flux, then wrap some solder around the tip, then turn it on. ur soldering will work like a charm
The solder i keep for quick dirty stuff, i just remove the tip and put it on the grinder wheel to get a perfect new tip, then, cup it slightly on one side. Also, you can get around just with dipping it in solder if you get the lead solder type. If you dab it in flux first, it's going to corrode a lot faster.
omfg, never scratch off the silver coating, once you do you expose the copper and the oxygen in the air oxidises the copper and in a few weeks your tip is gone and your down to a stump!
The soldering iron tip is a copper tip coated with iron to protect the copper underneath. You never scrape the iron off and you never use the tip as a 'crowbar' because the iron will scrape off. Without the iron coating the copper dissolves into the solder and you have to reshape it by sanding or filing. With the coating you always have a good tip. The black coating is because he let it sit at a hot Temperature for a long time. When you finish soldering the iron should be turned off. That’s good maintenance for the iron.
this is one of the best videos i have seen as far as converting a power supply, for all practicle purposes it just works. great job, i learned a lot..
Thank you so much!!
Thank you very much I did the same edit on a power supply and it works fine
Thx You just helped me with 3 projects at once
You are welcome.
Douglas Beachler 11z n
5:46 ant:D
Andrius Kamarauskas came to the comments to see if anyone else noticed.
نا
I would connect the green LED to the Power Good wire with is usually the gray wire. It gives 5 volts tho so the resistor value for standard green LED should be more like 280 ohms. Also I would put a red LED next to the green one to be on when the power supply is connected to mains and the mains switch is on. That one should be connected to the purple wire witch is standby, it also gives 5 volts so standard red LED would need 330 ohm resistor. And of course both LED ground pins should be connected to the black / ground wire. Good video still!
Nice job its how I would do it,looks good..........
nice choice on the paint . looks neet
Thanks.
It's Simple to make thank Q
kapo saludo de chaco argentina amigo.
nice start
you should put the brown wire on the 3.3v line . its a voltage sense , you need it .
Not really adjustable, but selectable voltage. I have used one of these pulled as an adapter for a monitor supply, as my wifes monitor kept shutting off. The power supply for it was just enough to power it and would overheat and die. Take a black and yellow connect the cord from the adapter problem solved... will melt the cord before failing this time. Then connect the start wire to ground then good to go. I should put up videos after watching this, as I can do much better. Also to me adjustable means variable with a pot, as in one voltage to another.
Great project.
excellent idea , now i have to do the same ....
Thanks
Nice edit, keeps the story clear. And a useful good looking project too!
good vid mate, enjoyed that and I'll give it a go sometime soon. thanks for sharing.
Hey brother, your electronic tutoring show is very good. I would have given you a 5 star if have have shown your amp meter readings. It was still a good visual show even it was a 3 selectable voltage power supply.
THANKS.
Nice project. I built one, but on mine I used a 25 amp terminal strip (available on Amazon) for the 3.3v, 5v, & 12v connections instead of the switch (Couldn't find a switch like the one you used).
With these Power Supplies, sometimes you have to put in a 5W , (sorry, don't recall the value)
resistor, otherwise it might shut-off the power supple when it cant find a load. It connects
between 5VDC and ground. Other TH-cams give the value needed. Guessing 100Ω
Really good man thank you
Welcome!!
Probably will not work because most older PSUs need a minimal load (at least on the 12V rail) to output anything. A 5W car light bulb (put inside the case) will likely do.
Other than that, good work. I used to build pirate FM radio transmitters using obsolete switching AT and ATX PSUs, LOL ;)
clean tip man !
Thank you..
RIP HEADPHONE USERS! Btw nice project I like the color!
Awesome Video
The ANT is the inspection job lol
great job guy u got me thinking in building one of them
fantastic mind
Electrical & Electronics Projects,thanks for a great video,great close up work with camera
You are welcome!!
2:20 Please, use heat shrink tubing and perhaps put the tabs of the selector switch to the bottom of the case. Dont want anybody to get zapped once those pieces of electrical tape dry out and fall off dont we?
i knew it was a good idea to keep my old psu
Nice job but you should have identified de selector positions with color dots (yellow-red-orange) or the actual values (12-5-3.3), nevertheless, thanks for sharing.
You are welcome and thanks for watching.
very good
Thank You!
Electrical & Electronics Projects. b
8:35 That's a noisy mother. Great project. :)
going to do this diy with an old power supply i have left over, i will upload the video and send you the link, much thanks and keep crankin..
Yes, sure i am waiting for video and i am really excited to watch it.
Viewers need to be really careful when drilling the hole for the banana sockets. It must be accurate and free of burs, otherwise the output can be shorted. Also this supply can put out lots of current, as much as 25 or more amps on the 5 V, and 20 amps on the 12 v. and there is no current limiting to this power supply, perhaps only for shorts. So it can do damage to things you hook to it. An inline fuse of perhaps 3 to 5 amps might be appropriate for small devices that don't need so much current
Very good observations. burrs, no current limiting etc. thanks
And, once again, fusing is not properly explained to the 'layperson'. People need to understand, I can charge a cell phone on a 5v 1000A souce, the device will only draw the current that it needs. You cannot 'over-provide', only 'over-demand'. If you could 'over-provide', then the whole electric grid would fail (at 8,000V at something like 200A). Thus, if your device is functioning (with its own fusing), there is no need to also fuse the power supply outs. If you are 'breadboarding', then fuse your design input at the board. Then again, we can all afford to break down and just buy a nice Fluke system for a grand, I guess. It is only play money, after all.
the wood burning pens i have are 15 volts at 10 ohms
Quick question. So the green wire is a ground?
very nice man mabye you can done one to hack a battery backup to run with solar panels as a charge controller and inverter
He has ants in his planz.
Like looks like u need som sterl wool for that soldering iorn
Nice project. Phase 2, add an adjustable voltage regulator on a fourth switch position... good projects are never done ;D
LOL the ant at 5:05, it wants to be on youtube!
Thank you very much! LOL This ant is my assistant while filming videos it has helped me in every single video that i have uploaded;)
Nice project. Though, I'd prefer not to hear loud music and some texts in the video but spoken explanation.
Do you have somewhere on your YT Channel a project where you can regulate speed (i.e. voltage I suppose)
for tools with single speed?
not sure how you made the 'holes' in the frame but dang you are Awesome.. thanks for the share and keep up the good work : ) God Bless!
Sorry for late reply. The holes are made by drill bit.
All of the solder joints I saw were cold! A little more heat and rosin core solder would do a much better job.
Maybe just rivet the switch, the long screw looks like it could short something.
magnificent
🖒
You should also use -12V output together with +12V and you'll get 24V output (but current is limited by -12V output)
I'm still watching it now and it is really really really really good so far 🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑🤑
thanks, great job
You are God! Thank you!
Dude can u list down the components u used to modify the smps like the knob and so on..
That's great ....👍
u can get more voltage if u play with the negative voltage, such as 24v (12v + -12v), 17v (5v + -12v) etc
piece of potato LP
I am no expert, but if you're going to twist all of the wires together, wouldn't it be a good idea to put a diode in the middle of each wire?
Nice work!
man this was a amazing video, could you do one with a lcd with the read out voltage?
cody perret he cant even do a ln adjustable one to make a one with lcd
just use a voltmeter
or buy a cheap one and open it and hold its mobo to thr top WITH STANDSOFF SO IT DOSENT SHORT OUT
and drill a space for he holes
or u can use the advantage of the ventilation holes to ewsy drilling
ok thanks
Like a boss!! Great project!! How much of a mod would it take to make it a variable voltage output?
You could use an LM317 adjustable regulator and just the 12V line to make an adjustable supply. How to do this is in the 317 data sheet.
@5:46 dude you got ants lol
I was wearing head phones at the beginning...
what did you use to make those holes? a dull beaver? lol
you should invest in a sheet metal hole punch, 30 to 40 bucks at harbor freight here, and no metal dust to potentially ruin your project by crossing over some circuit areas creating a short :) thanks by the way for showing this :), might have to look up one of these rotary multiple contact point switches :)
Can't you make 1,2,3,4,5,6,7,8,9,10,11,12V adjustable.
You can, but you need an array of resistances that cut back the voltage (that's how old power supplies worked). In this for, actually, you can get two more phases by using the negative voltages. At some point, tho, IMO, it's not worth all the trouble considering a simple (decent) bench top power supply is quite affordable these days. I can't pass on off the top of my head, but, i can tell you for sure that if you didn't have the PSU around, you'd be spending less than buying a beater PSU to mod.
switching resistors in the rails would be the most inefficient way possible and way cut down on the available current not to mention the heat of passing your output current through resistors
old power supplies used transistor output stages of analog design before that was replaced by analog voltage regulators and analog voltage regulators with transistor buffering. the old 3055 was a common favourite in psu designs
now most modern designs are PWM controlled which run a lot cooler and are way more efficient, but theres pros and cons as to if pwm or analog is best as a bench supply, personnel preference for a bench supply i'd go analog design as its less noisy on the output rails but downside is cost per amp delivered
yes u can. u can buy one of those BUCK DC-DC supplies from eBay for less than $5. it is good for about 10 Amps and they are adjustable and protected and connect that to the +12V supply. u can add a Boost cost less than $3, also to the same 12V input wire which is also good for 10 Amps and have a p/s which will go down converter or on the Boost an up converter. So now u will have continuously variable output from 3 volts to 10V and then from 13V to 30 volts, for an added $8 or less. and of course u can also have the three outputs of 12, 5 and 3V like in the video each of which is capable of higher current than 10 Amps. I don't know if u will need more than 10 Amps but still..... the Buck supplies also has current limiting but the boost does not.
Great video!!!
Shall we use high what resistor as a dummy load
it made its appearance at 5:46 in the video
Can you take one wire from each (5v, 3v ,12v )and combine em all to have one 20v rail ? So what you'd have would be 4 different voltages from one that you usually only have 3 voltages .... Thanks for answering
in other videos they connect dummy lode resistor and u don't connect why???
sir parts ke nam bhi bataya karo last me taki parchage karne me paresani ka samna na karna pade ok sir thanks
Good video but music is annoying.
Good video. Thank you. People make fun because they are unable to create but critical of others. Those are the losers. One request my friends , can you advise me as to where I can purchase this 3 Way position Switch?. Any link?. Thanks.
From any local store.
good job. nice ant at 5m45s ;)
Hey , In next video please build Bluetooth Portable Speaker? PLS PLS i like your vids :)
Hey man great idea and build I'm having a little trouble in seeing how this could be useful except for running fans like in the video could you please elaborate as to what type of applications this could be used for or maybe why you came up with this meaning what personal purposes you had for this build ? Also wouldn't you be limited to the PSU max power watt rating ? Great idea though just wondering how it could be used in my day to day life . :)
why more and more people using that kind of shitty music? my ears are bleeding!!!!
I agree with u. we try to listen for what the guy is saying and we only hear some stupid loud music.
Is it washing machine selector switch?
What camera you are using? tq