20 Amp Battery Charger with Computer Power Supply - 220v AC to 1.5v / 3v / 6v / 9v / 12v / 24v DC 

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Purple Wire is “5v Standby” it gives constant 5v/2A while the supply is plugged in (even if it is turned off) Grey Wire is “Power Supply OK” it gives 5v when the power supply is working correctly.

One of the few that properly explains his work, I'm the total ignorant on electronics, but these explanations make me understand everything better.

It's an intelligent usage of SMPS with its different combinations of power supply. GREAT

Well that quite interesting i forgot that you can take the -12 v blue wire and as well the 12v to make up 24 . But the -12 will not give more that 0.7 to 0.9A usually better tap on the transformer or better you can reworked a bit but that mean you have to remove the supervisor ic . Got mine simple one done few year's ago . Great work

Damn!, thank you very much. Finally i found a video on you tube explaining how to reuse this power supply. I saw a lot of videos in spanish (my native language) and nobody showed simple examples like you. Greetings from Venezuela. Suscribed.

Muy buen tutorial, te felicito y a la vez te agradezco por compartir con los que siempre buscamos que aprender algo más de la forma tan sencilla y amena, un fuerte abrazo desde Perú

Congratulations for this video. I am a follower of your channel for two years ago or perhaps more. I have seen more than 40 videos about computer supplies but no one with this focusse. Very interesting and practical!!. Perfectly explained as always. Thanks and continue . Greetings from Madrid. Spain.

Wooow superb . I finally found a video about a great power supply . Hats off bruh ❤️❤️❤️❤️❤️

Thanks for your video. I learned a lot.

Great work as always. I also have a battery charger for my 260Ah battery. That seems like a PC power supply but inside the power supply case I fixed a specially designed charger circuit which is awesome. That charger have great features like anti spark, reverse polarity protection, charging control, current limitation safety and much more. A regular PC power supply don't offer such features.

This is a great video. So glad I found it. Best how-to vid out there.

Excelente tutorial maestro me ha facilitado mucho trabajo muy bien explicado estoy suscrito para sus demás vídeos exelente

Bro amazing what a clean and smothly way to explain every thing ...🙂👌👍🏻👍🏻👍🏻

Very very nice 👍❤️🙏 Clear explanation thanks you

I had no idea you could get so many voltages with different combinations of wires. Awesome!

Excellent video, I always checked power supply the usual way and never really thought of checking such combination of wires. Blue and orange seems perfect way to charge up 12v battery (and packs), although I wouldn't recommend using it unless you've BMS installed. What is the value of diode you used to drop voltage?

Par Excellent Informative Video you have made seems you have digested this particular knowledge & expressing with quite ease! Admirable wisdom a true Teacher must have!

Very good video thank you so much my friend for this information ♥️♥️♥️♥️♥️♥️🆗️👍👍

great video I've learned a lot!

The purple wire Is 5v too, It always outputs 5v even when the green wire isn't shorted to ground

What a great things you have done...

It's worth a mention that the output power of -12V/-5V lines doesn't scale up with max power output of the PSU. They are limited at 6W/2.5W power output (@0.5A max current, as in your case), even if you have a 400W model. And that limitation carries over to any combination you'd use them in, for example the 24V. So "... 24 volt and all this at very high 20 Amperes" is definitely overblown.

Thanks Sir. This ur video is transformative.

Thank you so much brother, this has helped me a lot for my project.. Hoping to see 1M soon, you got a sub too now! ;D And for those who are wondering, this is a ATX Power Supply which means that it has a wire which can keep supplying +5V Battery even if its powered off and that is the Purple Wire which does that. The Gray Wire provides +5V if all the other wires function correctly.. I can't go any simpler than this. And big thanks to @sBeDs in the comment section below, he helped me figure this out and I am spreading it forward. I love your videos and I like to recycle old used products and this has helped me create a computer fan powered without a motor but with a power supply. Love your vids, keep doing what you're good at.

In computer classes, we were always told, never open your power supply, neither your monitor. At that time, the monitor had the big cathode ray tube. And the power supply had some cooper wiring and capacitors.

Gracias,muchas gracias, saludos desde Venezuela

Thank you so much Mr, your voice is so good, i like your voice

Nice video, thanks :), suggestion, add extra fuse for protecting your PSU.

Super message thank you sir 🙏

Be VERY careful... For example, the -12V (blue wire) is only rated for a VERY small load! As for the two 'unknown' wires: - the grey is a 'Power-Good' output (to tell the computer MoBo that the supplies are all 'stable') - the purple is +5VSB (it's the 5v 'standby' voltage which is present even if the green 'start' wire hasn't been grounded)

very informative.

Nice 100% thanx. Good explanation

Love you bro , finally I am not opening my computer ❤❤❤

I made an electrolysys power supply it works good for remove rust

My friend just... THANK YOU!!!🙇‍♂️ I don't spend 100 euros for buying two 12v 5a power supply for my Imax chargers (1s-6s 80w).. I use them for recharge my 5s batteries!! I use 12v 1a power supply from wireless home phone... To charge (balance) a 5s4p battery make 10 hours...😨 with 0.7 amber...!! So I have 4 batteries 5s4p and 2 imax 80w.. Waiting for low voltage and I will charge them with 1.5a... I want to believe, I will charge them all in 10 hours...!! Thanks again for your idea!!!👏🏼👏🏼👌

good work provided detail this will help a lot

U are a genius, great job bro

Great job as always, I m a big fan of yours but bro just tell me from where we can bye that variable power supply which is shown may be in your each n every videos 😉😉

Very interesting !! You have got a like from me ! thanks for your time

Great awsome, sir even explain us the wiring of the smps

thanks you my friend for benefits us

Don't charge lithium cells with constant voltage! It will probably draw tens of amps. They must be charged with constant current. There are cheap CC buck converters for that purpose.

احسنت ستاذ شكرا الك لي نشر العلم لي ناس نود منك المزيد 🙋‍♂️

hey hey, i just discovered your channel today, and so far, really great content, i also love recycling old electronics to experiment and make new stuff with it!! And if you haven't found out yet, i also wanted to tell you about the purple and grey wires because they can be very useful, the grey one is called "power good" and is used for safety, when you turn it on, the psu as a self test fonction that verify that every rail output the right amount of voltage, if everything is ok it will output +5V after a few milliseconds, but if something is wrong it will remain at 0 and a pc won't turn on, in a project like yours, you could use it with an led to make sure everything is ok before using it, i'm sure a more advanced user could even use it with some transistors to prevent part of a circuit from turning on if something is wrong!!!! the purple wire is the 5VSB(stand by) and could be used to make your projects a little more fancy if you ever want to go that way, it's the only wire that will still output 5V even when the psu is turned off(but still plugged), a pc use it for a bunch of things, like keeping the battery charged, powering the mobo's led, sleep and wake up functions, etc.. it could be used for any number of things in a diy projects, from a simple always on led, to a more complex circuit like a clock, or even power a microcontroller... basically, anything fancy you'd want your project to be able to do while it's main part is off, you can, so long as it doesn't require more than 5V!!! XD Anyway, keep up the good work, i love watching electronic videos while i'm working on something too, specially when it's about recycling old stuff into something new and useful, because not only is it fun, it can help to save the planet a little and even save you some money in the process!! XD

I think (not 100% sure) the 2 unidentified wires are most probably connected to PGI and PGO pins of an integrated circuit supervising voltages (PGI = "Power Good Input", PGO = "Power Good Output"). That kind of IC monitors voltages (Over Voltage Detection, Under Voltage Detection, etc...), and is often an 8 pins IC in relatively recent PC power supplies, and is located in the secondary part of a power supply

very good video...thank you

Thanks for sharing!

very good. very useful

Amazing workpiece awesome 👏

Muito bom amigo..

Great bro amazing

Good job 👌👍

Can you use this to charge /test lithium batteries ? Would a buck converter and potentiometer do the trick?

BIEN EXPLICADO MASTER, EXCELENTE APORTE, GRACIAS...

should we use protection circuit for lithium ion batteries?

amazing

Thanks a lot 🙏

Some of the fans you can get two speeds, USB 5 volt, or 12volt high speed put in a cooler with ice you have a simple ac unit

Köszönöm szépen..👍👍👍😊

@ 24v it has very few amps. Im surprise it survived being connected to that big motor!

Well explained bro

which daoid are you use in 12v ups battery to controlling DC power?

God gives for your more knowledge

Can u use that to increase in regulated 13.8volts thank sir..

There's no overcharge protection for that?

Thanks you for your vidéos.i try to understand like you

Very informative video. Shukeria.

good afternoon, greetings from Venezuela, your tutorial is very good since it has given other voltage options that others have not said. not getting a 6a diode that someone else could place to charge a cell phone battery look for information and there is a 1000v nte5817 and 100v nte5815 that are equivalent but I can't find them either please I listen to suggestions thanks.

Thank you

great, thanks

The Purple One is 5v StandBy which means if the Green Wire isnt connected to ground it will still output 5v the Grey one is P.G(Power Good)

As others stated the -12V cannot carry much current. It's a single wire, I can't tell what size those wires are, maybe a 22AWG, that is a 0.6mm2 wire rated around 0.9A for power transmission.

Ok felicitari

NEVER re-charge batteries as described. Use a charging circuit to limit the current, have a proper charging cycle, and shut-off when charged. THE METHOD HERE IS AN EXTREMELY UNWISE.

What is that diode used for 12v battery charge

Is it really possible to charge a 175ah battery with this powersupply? I mean a light truck battery can be charged with this method as you said in the last part of the video take negative 12 put a doid in between and take the +3.5 to charge the battery?

Thankq bro 😎👍

This is so powerful

Will it be safe to run any appliance like motor etc if i connect different output wires to add up voltages by combining them? Pls ans.

Where can I get this kind of old cpu and the purple wire is standby 5volt from the 3amps diode

Good and clear explanation, I am appreciated.

Bro, u are amazing....

Thanks a lot You just saved me 100 $$ by blue and yellow wires.😂😂

The Atx power supply you have constructed is it capable of charging a 70 amps battery to 100 amps battery 12volts

Your Videos Are Awesome. ❤

Dose it is same for my model st_300blp

hi, please let me know, rating current -12V polarity is < 1 A,, how is it work become 20A if we use it together with 12V polarity

Plz see carefully that it is rated only 0.5 A for -5v and -12v. so if you want to use -5v and -12v in combination then you can draw only upto 0.5A. Otherwise you may end up with damaging it 😌.

bộ nguồn atx này công suất lớn. Good

Need to be very careful charging Li-Ion batteries. They do not like continual charge beyond 4.2V. Need to add in a voltage cut off circuit set for the nominal 4.2V.

Excellent

Very Good...!!!

you have a new fan!!

@9:10 what diode being used?

Thanks sir! ✌️PT

Nice❤️

your video is very good but dangerous action and no safety. to understand it i need to play many times and write some notes and drawings. thanks for sharing. i'm computer technician

Thank for sharing your knowledge Sir. Please what will be the expected maximum output current if I use orange(+3.3v rated 26amps) and blue(-12v rated 0.8amps) to arrive at 15v for my 12v200AH battery charging? Bcos I'm afraid if I will have enough charging current.

It would have better if you tell us about the Amps on each combination to better use it