Nice job. I've modified a few ATX power supplies before, but I only modded them to be variable from 10v to 15v, a simple thing to do. Your job of making it go much lower than what I did is really tricky, and you pulled it off really well.
This is the BEST video on ATX PSU conversion on the internet. Well done @kasyantv! Years ago, I modified an old ATX PSU, making Voltage _and_ Current adjustable, following to this video. This PSU has served me well for many years (and it still is). Adding buck converters is for pussies. This conversion is super cheap and solid. Any good electronics engineer should be able to do it.
what about -12v & -5v outputs, as you have higher positive voltage on +12v output you'll have higher negative voltage on -12v and -5V outputs, so be carefully with capacitors at those outputs. Second thing: you have not removed R52 (100K) from pin2 so the voltage divider (which you had added and which is formed by two resistance 4k7 and 1k2) also depends on the R52 (100k) which will be found in parallel with 1k2. R52 is not always 100k for other ATX, so you must report it if it is taken into consideration (which is the case for your video) or remove it if we have designed to make a divider by only 4k7 and 1k2. your divider gives 1.0073V at pin 2, my ATX, the R52 has the value 4k7 thus the divider gives 0.845V at pin 2 which will modify the output voltage range. I missed the 5K1 between pin14 & pin2, so the overall divider will be: 4k7 // 5k1 between pin14 & pin2 AND 1k2 // 100k between pin2 & gnd , which gives 1.63V at pin2. finally 20k between output & pin1 AND 2k2 between pin1 and gnd will give us a maximum output voltage of 16.45V
this is so good work Kasyan but it'll be more advantageous if you'll be telling us why you changed certain components, what is their function and how you knew the values to replace with. Thanks!
Personally I was only getting 10 volts max with the 2K2 resistor from pin 1 to ground, replaced it with a 680 Ω like the original schematic and it goes up to 19v.
Sir, how many registers can I set from 7500 to pin number 1 and get 14 volts? And should the previous connection of PCB with PIN 1 be disconnected? Thanks.
Hello Aka, in the video you mentioned that it is possible to increase the voltage above 15V. How exactly can it be made? Maybe this can be the 3rd (optional) part of this series. What do you say? Thanks a lot for those valuable infos :)
I hope this is the one I have wanted,, so far after 6 years I have not found any that cover any of the 7 different brand ATXs I have,,, and I see it's the same tl 494 of which I know I have none,, never mind. The search goes on. Anyone know a video tutorial on identifying the feedback? But I love listening to your voice,!
Thank you for this excellent job, however I have a question: Is the first diagram that appears at 48 second of your video the final diagram? You have removed the connection to the ground of the output transformer as well as the diodes which are connected to it to replace them by a diode bridge. It is logical but in your comments you don't mention it! Thanks for a possible response.
Hello, nice video ! i have also a 250W with KA7500 and a EST7610 supervisor. If i do what you show in the video, the supervisor will not go into fault ? thanks !
Like all used computer SMPS units, this is not really the best approach for a LAB supply. It only just makes it as a 'rough and ready' wet cell automotive battery charger (as long as you take care using it) because the unit was never designed with the kind of mains isolation safety factor for such tasks....
Thanks for this information, very nice tuturial! But i have an issue about output voltage, as i increase the voltage up to about 14 volts, the unit was shutdown, The unit resume as i adjust the output lower than 14v, then reset the power. Please comment about this problem, thanks and more power!
Nice job. But you wired the adjusting pot backwards. Turning it CCW (Counter Clock Wise) by tradition and convention should turn it down, not up. And you should add a resistor between the pot and pin 1 to limit the amount one can set the supply to. Otherwise it's easy as all heck to make a mistake, turn the knob CCW and think you're set to the lowest level when in fact you're set way above the voltage of the caps at the end of the 12V line. ALWAYS design with idiots in mind. Otherwise someone will build this and then blow it up.
Thank you for perfect work but I think it is complex and not easy at all any mistake or fault can destroy the circuit .. in short you can use five pieces of lm317 together to get high current( if you need it) and transformer to do so ..it's easy and simple and saver than pc power supply. .
The video mentions you have to be careful, which is why it took so long to make a video about it. You can't do the same with an LM317. It is useless for currents above a few 100mA, especially when you need a low output voltage.
Can you make full wave rectifier with 14v regulator from 10 to 100v ac input where the ac current is from a bike magnet coil output with maximum current with minimum power losses
Here goes (top line to bottom): Load ground wire Input ground - goes to connection point between the shunt and 16-th pin of TL494 Load positive wire Standby output of the ATX (purple wire) Supply ground
Bob Berg 1 year ago Here goes (top line to bottom): Load ground wire Input ground - goes to connection point between the shunt and 16-th pin of TL494 Load positive wire Standby output of the ATX (purple wire) Supply ground
It dont can get over 18v at 10A, the Transformator cant Do it. (Only 30v 6A can be postible But i think 30v are to much for the Rest of the circuit.) At 12v 15A =180w. So 180w / 10A = 18v.
I have Just damaged mine power supply.😭😭 Very sad because I have purchased it for modify and ended up damaging it permanently now Its completely shutdown😭😭. How noob I am.
@@khayyam741 yes bro I have purchased a old Chinese psu unit from a computer shop and the shopkeeper only took rs 150. I have also taken two old psu units from my neighbour for free.😁 But I have damaged one that I purchased. And one psu which I have taken has damaged itself. So I am left with one old psu which I love.
Нету защиты от КЗ, дану эту схему итальянца, она уже устарела. А если щунт оборвется то все напряжение пойдёт на 16 ногу и убьет внутренней компаратор.
Where are the test results under load ? Can it hold a constant current over the entire voltage range ? Can it hold a constant voltage over the entire current range ? As it is this is just a toy not a true lab power supply. Nice try though !
Nice job. I've modified a few ATX power supplies before, but I only modded them to be variable from 10v to 15v, a simple thing to do. Your job of making it go much lower than what I did is really tricky, and you pulled it off really well.
I really love your channel, it gives actually really useful content
This is the BEST video on ATX PSU conversion on the internet. Well done @kasyantv!
Years ago, I modified an old ATX PSU, making Voltage _and_ Current adjustable, following to this video. This PSU has served me well for many years (and it still is).
Adding buck converters is for pussies.
This conversion is super cheap and solid. Any good electronics engineer should be able to do it.
what about -12v & -5v outputs, as you have higher positive voltage on +12v output you'll have higher negative voltage on -12v and -5V outputs, so be carefully with capacitors at those outputs.
Second thing: you have not removed R52 (100K) from pin2 so the voltage divider (which you had added and which is formed by two resistance 4k7 and 1k2) also depends on the R52 (100k) which will be found in parallel with 1k2.
R52 is not always 100k for other ATX, so you must report it if it is taken into consideration (which is the case for your video) or remove it if we have designed to make a divider by only 4k7 and 1k2.
your divider gives 1.0073V at pin 2, my ATX, the R52 has the value 4k7 thus the divider gives 0.845V at pin 2 which will modify the output voltage range.
I missed the 5K1 between pin14 & pin2, so the overall divider will be: 4k7 // 5k1 between pin14 & pin2 AND 1k2 // 100k between pin2 & gnd , which gives 1.63V at pin2. finally 20k between output & pin1 AND 2k2 between pin1 and gnd will give us a maximum output voltage of 16.45V
Great modification
this is so good work Kasyan but it'll be more advantageous if you'll be telling us why you changed certain components, what is their function and how you knew the values to replace with. Thanks!
to get 15v
can i measure LED forward voltage by this power supply?
Hamad Zeb yes its the right answer, if you just want to copy and paste the circuit not to modify according to your needs.
ahmed sayed yes you can but you will most likely burn it as soon as it starts conducting.
I agree
Personally I was only getting 10 volts max with the 2K2 resistor from pin 1 to ground, replaced it with a 680 Ω like the original schematic and it goes up to 19v.
Sir, how many registers can I set from 7500 to pin number 1 and get 14 volts? And should the previous connection of PCB with PIN 1 be disconnected? Thanks.
There are much easier hacks for this, but mostly go from 4..5 - 16V max. If you really need the 1..4 V range it may be worth the effort.
in my case i got 4.7v to 27.7v. how to change range from 2v to 25v.
@@thoyibbasarah3302 Buck converter
Great tutorial.
Very thorough.
Outstanding! Love your videos!!!
You ROCK Kasyan!!!
Awesome channel
Awesome video i Like it 👌♥️👍
_You have new SUBSCRIBER_
Nice video waiting for the next part.
I tried it , it worked very well (: .. although the current adjustment isn’t working but the voltage adjustment is working perfectly (:
Yes, but it's a woman!
is current adj isn't working?
*Greatscott! Left the chat*
That channel is rubbish
Where is the fan voltage supposed to be connected to? It can't run from the output, as it will destroy the fan when you up the voltage...
Hello Aka, in the video you mentioned that it is possible to increase the voltage above 15V. How exactly can it be made? Maybe this can be the 3rd (optional) part of this series. What do you say? Thanks a lot for those valuable infos :)
hi nice work but what if i need more than 15 Volte what this the Resistor of Value must use ?
i burnt a couole of similar power supplies whule trying to alter them, i hope this method is safer.
I hope this is the one I have wanted,, so far after 6 years I have not found any that cover any of the 7 different brand ATXs I have,,, and I see it's the same tl 494 of which I know I have none,, never mind. The search goes on. Anyone know a video tutorial on identifying the feedback? But I love listening to your voice,!
Thank you very much Kasyan!!
Excellent & informative video!!
Please tell me where part 2 is.
Thank you in advance, Norman.
Thank you for this excellent job, however I have a question: Is the first diagram that appears at 48 second of your video the final diagram? You have removed the connection to the ground of the output transformer as well as the diodes which are connected to it to replace them by a diode bridge. It is logical but in your comments you don't mention it! Thanks for a possible response.
Okay...great job...
When I put up few volts (16-17V)
Why those big resistors on output are getting so hot...?
Awesome work, man!
New mods use e.g. DC-DC 12A 300W Adjustable Voltage CC CV Buck Converter 7-40V to 0.8-28V
Hello, nice video ! i have also a 250W with KA7500 and a EST7610 supervisor. If i do what you show in the video, the supervisor will not go into fault ? thanks !
Very inspirational as usual, - keep it up.
thanks, bro nice job .i did it
Does it still have overload protection?
Like all used computer SMPS units, this is not really the best approach for a LAB supply. It only just makes it as a 'rough and ready' wet cell automotive battery charger (as long as you take care using it) because the unit was never designed with the kind of mains isolation safety factor for such tasks....
Thanks for this information, very nice tuturial! But i have an issue about output voltage, as i increase the voltage up to about 14 volts, the unit was shutdown, The unit resume as i adjust the output lower than 14v, then reset the power. Please comment about this problem, thanks and more power!
Nice job. But you wired the adjusting pot backwards. Turning it CCW (Counter Clock Wise) by tradition and convention should turn it down, not up.
And you should add a resistor between the pot and pin 1 to limit the amount one can set the supply to. Otherwise it's easy as all heck to make a mistake, turn the knob CCW and think you're set to the lowest level when in fact you're set way above the voltage of the caps at the end of the 12V line. ALWAYS design with idiots in mind. Otherwise someone will build this and then blow it up.
Why did you disconnect pin 15 from 13 and 14?
Thank you for perfect work but I think it is complex and not easy at all any mistake or fault can destroy the circuit .. in short you can use five pieces of lm317 together to get high current( if you need it) and transformer to do so ..it's easy and simple and saver than pc power supply. .
The video mentions you have to be careful, which is why it took so long to make a video about it.
You can't do the same with an LM317. It is useless for currents above a few 100mA, especially when you need a low output voltage.
Current adj is not working. 4:40, why there are red, yellow wire and caps connected to the dioda?
Can you make full wave rectifier with 14v regulator from 10 to 100v ac input where the ac current is from a bike magnet coil output with maximum current with minimum power losses
excellent
Wonderful . Go ahead.
please give us a very easy circuit of adjustable power supply of (0-30V) about 5A.. You should use simple components... thanks
thank you.
good work
can you please make a video about adjustable smps?
Why not just connect buck-boost converter to the output of the ATX
Because buck boost converter cost
And have 80% efficient
And power supply have voltage regulator built in but you need Small modification
6:42 But I like fireworks ;)
7:44 please translate it
Here goes (top line to bottom):
Load ground wire
Input ground - goes to connection point between the shunt and 16-th pin of TL494
Load positive wire
Standby output of the ATX (purple wire)
Supply ground
I did the mod, but switching transistors get too hot to touch at 5 amps, 10 amps is the hell. What could be the problem?
argh, another ATX conversion. there are now dozens of them on youtube.
I like this video.
muy interesante la tutorial, puedes mandarme el esque aplicado a la modificacio,muchas gracias.
Can i use 0.5 ohm (5watt) in 0.5 ohm (5watt) place...?
I modified my atx to go from 4.7 to 24.6 volts and you made it lower to 1.5 volts
great job
is it possible to make the voltage down to zero volts?
There are no shunts top discharge caps
THANKS
VERY PRO. JOB
Very interesting
Hello, my own psu stops when the output voltage goes up to 13.8v. What happening.
maybe the overvoltage circuit: from outputs voltages through some z diodes, diodes and resistors, to pin 1. This link must be cut
Nice. But amp and violt meter connection label is in another language
Bob Berg
1 year ago
Here goes (top line to bottom):
Load ground wire
Input ground - goes to connection point between the shunt and 16-th pin of TL494
Load positive wire
Standby output of the ATX (purple wire)
Supply ground
How to increase it voltage upto 30 volt
Can you give sprint layout macro file
Very nice job :)
السلام عليكم معلش ممكن توضح كيف فعلت التوصيلات
Why current variable is not working
Could you current limit +5V output?
This looks suspiciously like something I made...;)
This circuit appeared on an italian forum around 5 years ago :)
My smps has 2005Z chip, is it possible to modify?
plzzz i need a clear diagram for converting ATX 0-30V & 10A ??
It dont can get over 18v at 10A, the Transformator cant Do it.
(Only 30v 6A can be postible But i think 30v are to much for the Rest of the circuit.)
At 12v 15A =180w.
So 180w / 10A = 18v.
Can I hookup 2 computer power supply for higher voltage
Power supply dari psu
How to made Adjustable power supply from computer ATX drive on lm339 chip with voltage regulation??????
thats nice
what if i want only to adjust voltage without current . and how can i reach less than 1.5 volt
He tried that someday , did not succeed
me too. I got range from 4.7v to 27.7v. wanna lower voltage from1.5v or 25v. any suggestion?
Buen video ayudame yo tengo con el circuito integrado SC6105B
Free Ukraine stop the war, russian people wake up.
освободите украину остановите войну русский народ проснитесь.
Where is the next video?
Please upload circuit diagram
Great
Background music name please
nice
Yes i will download my own gerber files......
This good but to hard to make thank you
How remove the protect?
Please help video link
You need to find a zener diode connected to the 12V line on the ATX supply. Remove it when you find it. I hope this helps.
can you mod atx ic wt7520 ??
My computer PSU (450 watts) contains only HS8108 (20 pin chip) what should I do now ? 😭
The HS8108 is a different beast. The TL494 is easier to modify. It's possible to modify HS8108 but requires a lot more work.
Jammit Timmaj, probably I need to download the datasheet...I think
i need 35- 0 35+ 5a smps pawar suplay
I have Just damaged mine power supply.😭😭
Very sad because I have purchased it for modify and ended up damaging it permanently now Its completely shutdown😭😭.
How noob I am.
Should have bought old supply from scrap from core 2 duos or older systems
@@khayyam741 yes bro I have purchased a old Chinese psu unit from a computer shop and the shopkeeper only took rs 150.
I have also taken two old psu units from my neighbour for free.😁
But I have damaged one that I purchased. And one psu which I have taken has damaged itself.
So I am left with one old psu which I love.
@@ronaksoni2729 yeah I used an old PSU which I picked from scrapyard. Used it for years as it was but now while trying to modify it I am stuck.
Нету защиты от КЗ, дану эту схему итальянца, она уже устарела. А если щунт оборвется то все напряжение пойдёт на 16 ногу и убьет внутренней компаратор.
👏👏👍👍
new sibscriber
Awesome!
Send scematic and data
like
جميل لكن عربي مش فاهم انجلش
Please translate the video in English.
Where are the test results under load ?
Can it hold a constant current over the entire voltage range ?
Can it hold a constant voltage over the entire current range ?
As it is this is just a toy not a true lab power supply. Nice try though !
Muslim indonesia berjihad
Manemle
how the hell could i read russian????
This is going to get some n00b electrocuted! 😂
Way too technical and broad for any real diy or implementation.
Can you make one for me. I'll pay you
Unfortunately I live in another country
Kasyan TV well I'm ready to pay shipping charges as well 😊
It'll be very expensive. Maybe it will be better if you buy any factory power supply? I can help choose them
Kasyan TV Thank you very much. Appreciate that.
@@KasyanTV in what country do live?
Thumb down for the stupid video title. Look up what atx is before writing that into the title!
You failed in controlling amps 😂, when you adjust voltages amps go down it self, and when you adjust amps voltages decreases it self 😂😂😂😂😂