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The purple wire.... Useful for Arduino projects and the like. That 5 volt stand-by (as mentioned in comments). You can use that and ground to power an Arduino without having the 12 volt rail on(green connected). Then, in code, you can have Arduino pull the green to ground, turning on/off the 12 volt side based on time, inputs or such. 3D printers for example..... using the above, you can put the printer into a low power state when printing in complete (if enabled in code and gcode). Lights.... turn on/off 12 volt lights on motion, time or noise. 1 note.... some ATX PSU's (mostly newer ones) need a load on the 12 and/or 5v side to continue running longer than 15-30 seconds. A fan usually does the trick, though resistors can usually be used too.

At 12:55 the purple wire is always +5VDC, even if the motherboard is turned off. Gray wire is a signal that "all is well" and it's OK for the rest of the power to turn on.

Процессор это главный камень на материнке под кулером, а всё вместе называется - системный блок. Сейчас время троечников, дилетантов. Человек не знает простых вещей, но хочет научить других.

purple wire provides 5V all the time despite the green wire being shorted to ground. it is labeled Standby power. and it is required for allowing such items as indicator leds and clocks to work in the computer. The grey wire is a Power OK wire used for the motherboard to communicate with the power supply in order to tell if the voltages are okay in the powersupply

Another thing I really like salvaging out of computers are the super strong neodymium magnets! You can get almost a guaranteed two large ones from any hard drive -- some small laptop drives may only have one magnet, but that is rare (the magnets in the laptop 2.5in HDDs are much smaller than desktop's 3.5in, but still very useful) Then, there are also at least two tiny ones that can be harvested out of the Optical drives (cd or dvd). They are what control the actual laser diode position, and are connected to a small metal frame by some awesomely strong glue, so they're sometimes hard to pry out. Just be careful, because not only are they super strong, but very FRAGILE. Slamming against metal can cause them to fracture. Or, their metal coating might flake off, exposing the magnet, which can easily break apart into a magnetic dust.

The two wires that you didn't use on the power supply... Grey: will give a voltage greater than 2.8 volts if the power supply is outputting a 3.3v, 5v, and 12v. A signal needed for the computer to boot. Purple: will be an always on +5v even if the PSU is turned off.

I have a couple of little 130 dc brushed motors that will run around 65,000 to 80,000 rpm. Its only for a few seconds because the brushes disintegrate but its pretty awesome 2 to 5 seconds worth of time.

I don't really know much about electronics, but this was so fascinating, and educational on the fundamentals by example that I am now really interested in learning more. Salvaging old computer parts to turn them into useful things sounds like a wonderful hobby. Thanks!

Be careful to observe the computer power supply unit, (PSU) max rated current on negative wires. Most PSUs negative voltage rails have comparatively low current ratings.

The Grey Wire should be the "Power Good" Signal. The blue -12V and white -5V Wire are outdated. These wires are no longer needed and not necessary anymore. These has been used for old Soundcards and serial Interfaces. In most cases these negative Voltages can only loaded up to 0.5A (500mA). The purple Wire is the +5V StandBy Supply. This wire delivers +5V at 2Amps even when the PSU is turned off.

Nicely done, that power supply salvage gives me a noce idea for decorating led in my room as i got plenty old psu eating dist in my store with no idea what to do with it. Thank u again

Using the negative 12v rail will limit you to 500ma to 1.5a max, the purple wire as stated by charlie gosh is always supplying 5v good for charging a phone but instead of the diode to limit voltage I've used the cheap lithium cell charge boards on the ends that way you have a proper micro usb to connect to and also the chip switches output power off at 4.1-4.2 as apposed to trickle charging permanently to death, great video.

Old computer is litrally rich mine of different useful parts and components. I myself still have parts from 90'th decade, even fully operational AT power supplies and I'm sure I will find practical usage for them. BTW very nice "junkyard"! :-)

I wish you would rename your title. "Do not throw away your old CPU Tower is better since the CPU is actually the chip on the motherboard. And what I was expecting to learn about. Interesting stuff nevertheless.

Anyone charging batteries this way should know not to do so unattended or without close monitoring of voltages to prevent overcharging and burning your house down. You can find a controller to do this for you. Otherwise descent content and good job on the video.

I think, that’s good idea! Thank you so much!

Take a look at the current carrying capacity of the individual voltages. Especially the negative voltage (18:55). Have you ever checked the voltage drop of a silicon diode at different currents (characteristic curve in the data sheet)? Why are different charging methods used for lithium batteries, lead batteries and NiMh batteries and not just any voltages applied?

Please rename your video from "Do Not Throw Away your Old Computer CPU" to "Do Not Throw Away your Old Computer PSU" Its a huge difference. CPU is a Computer Processing unit and a PSU is a Power Supply Unit.

the purple wire is +5VSB - meaning it will always send 5V power even when the power supply is not turned on but connected to AC mains. AND the gray one is POWER OK. it is for the motherboard to understand that all the power rails are stabilized and CPU can feed on the power.

When charging NiMH cells watch out that you dont overcharge it as the final charge voltage is about 1.4 Volts If left alone too long this could lead to a fire! I speak from experience as my house burnt down because a tenant overcharged a single AA cell!

I seriously think that before you give yourself a user name such as "The Professor", you need to learn what a CPU is. Here, I'll help.... The "CPU" is a processor chip that is "Inside" the "Computer". The "Computer" is NOT the "CPU". The "Computer" is a bunch of different "Components", including the "CPU", that are all put in a single unit and used to do "Computing" tasks.

as for the rest of the parts of the power supply, remove the gold pins. the tiny stepper motor (it has a worm gear) can be used for a 3d printer, the torroid coil for the power supply are worth a little bit of $$. (i've taken apart 5 P.S., rebuilt 2 computers, and have a lot of motors, fans, gears, and parts!)

The grey wire is the POWER GOOD wire which shows that the ATX is working good , You can connect an led with a 470 ohms resistor and the ground lead for indication, this comes on when the green & black lead are connected The purple wire is STANDBY 24:00 ( 5.0 volts )which can be connected to an LED also via a 470 ohm resistor to ground. This indicator will come on when the ATX is plugged into the mains with the switch on the back is on even with the green wire in Off condition You also have to put a dummy load of 8 ohms / 50 watts on the 5 volt rail for the power supply to work properly , This resistor could get pretty hot so keep it isolated on a heat sink

the purple wire is the standby wire. After turning on the power supply with the switch, it gives 5V. Gray goes off the computer ... or vice versa :)

Also there are bulging capacitors on the output side.

CPU é a sigla para Central Process Unit, ou Unidade Central de Processamento. Ele é o principal item de hardware do computador, que também é conhecido como processador. A CPU é responsável por calcular e realizar tarefas determinadas pelo usuário e é considerado o cérebro do PC.

I believe those wires are the unswitched 5v. This is a 2 amp 5v line that is always on even if the power is off. This is for lights and stuff that displays when the computer is off. I ran into the same issue.

Wah channel bagus ini nambah pengetahuan pisan ini mah euy... Lanjutkan juragan...jos pisan euy...

The 36v motor has high torque, not high inertia. High torque is why it snaps round in your hand, high inertia would make it slow to spin up. Inertia is "a quantity expressing a body's tendency to resist angular acceleration." whereas as torque is " the rotational equivalent of available linear force"

thanks for your video. this is a big help to me. looking forward to your next video. i also try to upload some repairing video.

The bump on the rotor is a magnet not a Hall sensor. The Hall sensor is on the PCB labeled "H1".

Good knowledge n how to use old CPU HARD DICS. Very interesting

I was half expecting to see the first ever video of someone being shot dead with a hall-effect magnet. Careful dude!

I guess it's a lingo thing. I was intrigued to see what salvage parts you could get from an old "CPU". It wasn't what I call CPU tho 😁 (I would just say "old computer")

The purple wire is the Standby terminal and the gray wire is used for neutral conductors.

Very clever young man , multiple uses great work 👏

Todella hieno ja selkeä video.

Замечательно, сначала откусываем все коннекторы, а потом думаем "и от куда же эти два провода"🤔

I think to myself look at how much joy this brings to him. Hopefully everyone finds something that makes them as happy as this guy is over this.

amazing! perfect! I Love anything like that. thanks

CPU is a specific part of a computer, I thought this was going to be a completely different video

to avoid the sparks when you connect the wire connect the negative first and then the positive

I took the PSU from a Playstation 3!! It gives out 12 Volts at 23.5Amps and 5Volts at 0.6Amps Very useful!

ขอบคุณที่แชร์วิธีทำดีๆให้ดูนะครับ

The "Professor" doesn't even know what a CPU is!

idea genius thank's for sharing

It’s nice to know. Old computers parts can be used like the power banks 👍

There are some traces of gold in there, if you locate, it would be helpful for many

Incredible video, I learned so much! I wish I could bring all my old "junk" electronics and apprentice with you for a while.

Первый раз увидел заточку медного жала паяльника на токарном станке🤣😂🤣 Ржу не могу!

Well, I pulled out of the system unit the motors from coolers, cd-rom. And what did I do with the processor(CPU) itself?

Hello there. Nice video, thank you. Just want to know what is the device you use to power the floppy motor with? Not the commercial one from Banggood but the other one, and where can I get one please?

Nice video, thanks :)

Помнится,я тоже как то из телевизора с кинескопом сделал ящик для обуви

Purple is 5V standby, grey is Power good signal that tells the motherboard to start booting when all the voltages are present and in acceptable ranges.

The grey wire is called as power good signal wire for the motherboard. It's voltage is 5v and it indicates that all the voltages and current from the power supply are good and motherboard can reset the CPU. If this voltage is absent then power is not good. In my experience when the capacitors are faulty this wire doesn't work.

nice video, but remember that -12V has only 0,5A!

Dude! NEVER, EVER mess around with LiIon Batteries. They are little Bombs sitting around, espacially when they age.

Great job, man!

I wonder what type of driver you’re connecting to, can I have the driver link??? ( I means the yellow- red- black wire connected to the driver )

Wow~ It's very surprising ^^ I'll have to try it

Negative measurement should be in between blue (-12) and black (ground) :)

Thank you very much for giving knowledge

You said blowers could be made. The RPMs are high but would there be enough torque to spin the fan blades plus move large quantities of air? That was a small propeller. What type of application would the blower work well in? Cooling down a room? What about using it as a desktop computer fan? Might be a great idea especially if you had several

check your lathe, it has a lot of unwanted movement in the compound.

YOU SHOULD HAVE MEASURED THE AMPERAGE CONSUMED BY THE MOTORS FROM THE SOURCE, BECAUSE IT WAS A SOURCE ON THE 12V RAIL, IT HAD ONLY 10 AMPS

Old but gold. Literally

Super! Thank your very much!

Thank you so much for sharing your skills in electronics. It is greatly appreciated. Congrats to your 100K subscribers and I am one of those that eager to learn as a hobby. Keep it up. Greetings from the Philippines.

Using a non-ground for ground may or may not work, as it may trigger certain protection like ovp/uvp.

You speak very well and polite I like it a lot !😍

zabardast dada ... tumne kamal kardiya ... ek aam admi bhi is video ko samajh sakta hai asani se

я один купился на кликбейтное название -Не выбрасывайте старый процессор компьютера- ?, в видео нет вообще ничего про процессор

ну прям прохвессорр. похоже не дождусь я про процессор, а что делать с компонентами системного блока, я бы даже сказал компьютера - это уже обсосано со всех сторон и не так интересно. Опаньки, а прохвессорр тут переводчик, возможно в оригинале так и говорится про системник

Thank you Professor

computer supply sector is the best part of video. I like that so much!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I watched the entire video but I didn't see any place where you used the CPU from that computer tower case. You removed the CPU heatsink but not the CPU.

Regarding the speed of your CDROM-motor you most probably did measure wrong. I highly doubt this motor would do such high RPMs. Laser RPM-meters just look for some change in contrast and if your measuring object has one contrasting line on each side you're doubling up your speed! If you get some out-of-balance rotational energies then you will make it even worse, it can get multiple times of what your motor really is turning around. For the power supply you made real mistakes: Any of the contacts on ATX plugs has standard function. So if you would have activated the mind before cutting all the wires you could have made up your mind by just googling "ATX power supply" and you would have seen the exact meaning of each wire. 2nd mistake was when you said "you can use the +5V wire and the +3.3V wire for charging 1.2V MiMH akkus. All rails (all voltage supplies) of an ATX power supply are ALWAYS meant to only be used Rail-to-Ground. This makes the 5V Rail producing and regulating for 5V only and only if you connect red as positive output and black wire(s) as negative. 3.3V can be used for 3.3V only (orange-to-black), Differential voltages inbetween 2 different rails may be half-decent with your multimeter and it may be working for very low current. But it never will work for higher output currents as an 3.3V OUTPUT simply isn't made to sink in the current produced by the 5.0V rail, it is made to DRIVE voltage output!!! This may just not work for some power supplies, it may even kill some power supplies and, of course, it will not be properly regulated output at all! DON'T DO THAT! I highly recommend not to do things like charging akkus from an ATX power supply as it does not have proper current limiting working with your akkumulator, it doesn't have proper and exact regulation of charging end voltage. You will very soon see your akkus dying from over-voltage or over-current. BTW: 12V rail normally isn't really regulated output, it is set for being somewhere in the ballpark all around 12V but it will vary with the load of any other rails in many, if not in most cases!

رهيب الباور سبلاي ... 12 و 5 و3 فولت بامبيرات متعددة ... تحتاج واحد رايق يعمل لها منافذ ويستفيد منها في الاختبارات الالكترونية

Thank you bro... For share your knowlegde

Don't trust a professor who uses CPU instead of PC, or even computer box.

You aren't much of a professor if you can't tell the difference between a computer CPU and an old CD ROM drive.

watching and sending support ,thanks for sharing

Bye! You have put the link for the adjustable power supply ... but I would like to know the characteristics of the electronic card used to drive the 3-wire motor ...

А я так хотел увидеть, что же он сделает из процессора.

👍🏽 Good Info

It's the ultimate blade of death lol. Those mirror have enough rpm for a mini Dremel

Thank you for your videos!!

Na verdade o certo do titulo seria "Não jogue fora o GABINETE do seu computador antigo" pois CPU seria o "PROCESSADOR"

Удивлён, почему так мало дизлайков... И, самое главное, почему ЭТО оказалось у меня в рекомендациях?

I was waiting for the CPU-part..:)

THANKS.very well explain thats

im waiting for more...

Still waiting to see a CPU.

А из нескольких сидюков можно сделать маленький 3D принтер, только 3D ручку добавить, или фрезер, из пишущего CD даже лазерный. Поэтому я попадающиеся приводы не выбрасываю.

Is it true that some power supplies get a signal from the computer at POST and will not work without this?

The CPU is a component not the entire computer case

Очень похоже, что тут профессора не отличают от процессора...

we do pretty well with this way, you can refer