DIY PSU?

I currently have a HP 6623A bench top PSU which is amazing to say the least but I never end up using all of the features and its pretty big. It regulates voltage and amperage but I really only need a really good variable voltage bench top PSU. What I need: 3x 0-12V 3A outputs What I have: tons of computer PSUs, wall warts, and everything in between. What I was suggested to use: 3x LM350T 3x 5k pot running off the 12V rail of a PSU. Does anyone have a suggestion for a better configuration? Is there a better variable regulator you suggest? -Thanks!

Question by newrev426 8 years ago  |  last reply 8 years ago


Broken PSU? Answered

 I recently seen an instructable on converting an old computer PSU into a lab power supply. I followed it correctly, connecting the orange wire to the brown, the green to black and a 10W Wirebound resistor across red and black. The PSU turns on and all of the voltage rails work (although some are out by +-.75V sometimes), but I can hear a faint screeching noise and the fan doesn't spin.  I though the screeching may be normal because all I normally hear is the fan, is this okay. The fan is rated at 12V 0.3A, but when I measured the voltage over it, it was only 3.4V, why is this and how do I fix it. Any help appreciated, Thanks. 

Question by R055_28 9 years ago  |  last reply 9 years ago


PSU Power Supply

I built a PSU bench power supply, but it isnt outputing the right voltages. It just out 5v for all lines(12v,5v). It has a purple wire that is said to be the stand-by, but the psu wont start unless it is connected to the 12v or 5v line. It also says that you have to have the brown sense wire attached to the 3v wire but this seems to do nothing. How can I make this thing output the right power(12v @ 22A, 5v @ 50A)?

Topic by tylerb 11 years ago  |  last reply 11 years ago


Turning on an old Psu

Hey there, I got this old PSU, a Delta DPS-350EB-3 from an HP NetServer. I'm trying to make a lab power supply out of it, i just can't get it to power on. There's a blue wire bundled with a ground that when shorted will power the psu for a second then shut it back off.  I tried to put a load on the 5v & 12v with no success. Anyone got an idea? Thanks

Topic by wbzial 5 years ago  |  last reply 5 years ago


+Help with Digital PSU+?

Hi everyone after many days of constant tinkering, I finally got the circuit of my Digital Power supply made. However, I am experienced difficulty in the programming side. I am using an Arduino with an LCD (and various other io such as a current sensor, voltage divider, button and rotary encoder). My program is limited to what I could find online for an ammeter/ voltmeter sketch. I wanted help or some guidance in figuring out how to use the rotary encoder to 'set' a voltage (visible on the lcd) and when i press the button, i send a certain signal to my DAC which is connected to my psu circuit. and i wanted to be able to switch over from voltage 'setting' to current 'setting'. Frankly, i have no idea how to do this :s ! here is a video of what i want it to almost look like https://www.youtube.com/watch?v=bGnTzT_OCpc Thanks  

Question by making9719 5 years ago  |  last reply 5 years ago


Computer psu problem?

I have been building a computer. As my last computer died (probably my last question I asked) I thought I would build one. I required a tower PC with a gigabyte mother board with a Pentium 4 CPU. I thought I would also upgrade my OS to Mac OS X with patches to run on an Intel processor. This has worked perfectly! Until I changed the case.. I Bought a power mac G5 case from eBay, and started work on it. I made all the necessary mounts for the mother board and placed the psu at the bottom. I have been running it with only the hard drive, no DVD drives. it has been also running flawlessly until I made a bracket for the psu. My PC turns on but only lasts until the starting up of OS X and what looks like the psu cuts out. I have removed the bracket now but still no change. I then switched it on with out the hard drive and again it cut out whilst confirm no Hard drive was installed. I don't know why it keeps cutting out? All comments welcome Oscar Thompson

Question by oscarthompson 8 years ago  |  last reply 8 years ago


I Hacked a PSU

So I replaced the cheap power supply on my Compaq so I could upgrade my video card. Anyways I'm left over with this 200W PSU and I have no use for it. I opened it up and I see components galore and a 80 MM fan. There is also a bridge rectifier and, some really big transformers, and two giant blue capacitors @ 200v, 470uF. Do I have to remove the PCB to discharge the caps before I start salvaging or is there a better spot. The Chinese that made it also made use of a lot of white hot glue. And the soldering on the PCB just looks plain bad. You guys have any thoughts of what I could do with it? Besides the lab powersupply instructable?

Topic by emuman4evr 10 years ago  |  last reply 10 years ago


Remove PSU rails?

This may sound like a stupid question but uh... How does the different rails of a computer power supply work? Could the other rails of a computer power supply be removed? So, suppose you have a computer power supply with 12v, 5v, 3.3v, and -12v, but you only want 12v without having the other voltage circuits operating. Is there a way to remove or disable the other circuits so you only get 12v without having other rails wasting energy not doing anything?

Question by poiihy 3 years ago  |  last reply 3 years ago


Is there an instructable for making a psu into a powerstrip???

I'm looking to make a psu into a 3 plug or more powerstrip.

Question by Raikou6 10 years ago  |  last reply 10 years ago


Remove short-circuit protection from a psu.

Hi, i'm new here and i have a little problem. I want to make a soldering iron because mine is broken. I have a ATX PSU, but when i short circuit the 12v(16a) output the PSU shutdown. I want to remove the short-circuit protection  from my psu, how i do ? I'm begginer in the electronics, so please help me step by step. BTW, Sorry for my crappy english, i'm just a romanian guy :P

Topic by GFXMihnea 6 years ago  |  last reply 6 years ago


PSU converted to Lab supply shuts down when anything bigger then a fan is connected? Answered

have converted PSU over and it runs small fans just fine but i try to connect anything larger and it shuts off. how do i figurer out what is causing this to happen? more: it is a 200w computer PSU trying to power a moblie ham radio max draw 6 amps

Question by srainsdon 8 years ago  |  last reply 8 years ago


Need help Hooking Car Stereo up to PSU for inside home use.

I need help hooking this up.  I got the main idea of the player itself(as in what wires are for what)   but when it comes to the PSU i am so lost. SO MANY WIRES AND PINS!  i need help knowing what to cut, what to connect to what.  I have seen some instructions around here and online but i just cant seem to get it right.  Thanks  Oh keep in mind this psu has a on off switch.

Topic by valmont325 7 years ago  |  last reply 7 years ago


psu 6+2 connector? Answered

Does a 6+2 connector on a psu do the same jobs as an 8-pin connector? thanks for anwering!

Question by didgitalpunk 7 years ago  |  last reply 7 years ago


Adjustable Voltage on PSU ATX

I have an old Rockford P450.4 amplifier that I salvaged an LM317T and LM337T from. It also had some two (2) potentiometers that I salvages as well. I have a 400W Coolamx PSU ATX that I turned into a bench supply. I have read that people have been using these two (2) IC's to maintain a constant voltage through variable adjustment. I have seen several tutorials on instructables, but that all lack clarity, instruction and do not provide enough detail. I could really use a good tutorial, but have failed to find one of great interest.

Topic by bprins 3 years ago  |  last reply 3 years ago


PSU bench power supply

My PSU appears to have blown up over the christmas holidays- it was a bit unreliable before, but now it won't boot up my computer at all. I replaced it with a spare from work which works fine, so I now have a not-working 400W PSU I'd like to make a bench power supply from, that will hopefully kick-start my desire to get into microcontroller programming. Does anyone know what the chances are that a broken PSU (no sign of magic smoke, it just doesn't power my computer any more) will still be working enough to use as a DC power supply? If it is, the 'Ibles sometimes disagree- what is the accepted way of keeping it turned on (short a pair of wires, attach a resistor across a pair etc)? It's a 20-pin connector with square 4-pin aux and the usual complement of molex.

Topic by PKM 10 years ago  |  last reply 10 years ago


Help! (5V psu problems)

Help!I'm trying to make a 5V psu for programming my new (but not so shiny v_v) ATtiny2313'sI've got the circuit shown below set up, but I'm getting out around 5.6V, when the spec sheets say that I'm supposed to be getting out 5V (+/- .2V) I'm using the LM 340t5, just 'cause I don't have any other regs (except for the MC78M05CT, which is basically the same thing.Any Ideas?!EDITI know what was wrong - it was my meter, it really was 5V all along ;)

Topic by T3h_Muffinator 11 years ago  |  last reply 11 years ago


Oscilloscope PSU whining noise?

My oscilloscope is a Philips PM3055. It's a CRT type with a modular internal design, one PCB is the PSU, one is the front panel, a few are TTL, etc. When I try to turn it on the screen is blank and the PSU makes a whining/whistling noise, and does not function. The whining persists regardless of connection to other boards and mains ground. (mains ground is normally not connected to the PSU, but there's a connector) I have found no bulging/leaking capacitors (though I have no way of testing capacitance) or other visible damage, except for cracked plastic on the front panel. But that's merely cosmetic. Replacing the PSU is not an option, since the scope is old and obsolete. Neither is buying a new scope. I am broke. All help greatly appreciated! If you help me fix it, I might just send you one of those fancy patches. I can only provide cellphone-camera quality pictures at the moment, and for that I am sorry. [Edit / update] I contacted Advance Product Services, And they sent me the complete service manual for the scope, free of charge. Those guys are awesome!

Question by Kirbsome! 7 years ago  |  last reply 7 years ago


Computer PSU's and Peltier elements?

Hey, I have 2 158W Peltier elements, that I would like to mount to some CPU-heatsinks, and power with an old 400W PSU. Can I "just do that"? There seams to be some caveats with how these units draw power AFAIK. Also, does anyone have any experience with how much heat displacement is needed to not just ending up frying the unit? Any suggestions on what heatsink to pair them with, and how strong a resistor to put on them? I want to use them at the maximum power I can get them to run with continuously for up to 2 hours. I have way too limited experience with electronics, and only a week to build my project, so I kind of have to go with the simplest approach here :(

Question by ELF 8 years ago  |  last reply 6 years ago


Computer PSU wire question? Answered

Hi all, I want to turn an old computer PSU into a lab bench PSU.  After cutting all the connectors at the end of the cables, I've noticed that some of the common (black) wires were made of copper, while some of them were made of nickel \ aluminum (Silverish). The same is true for the +5V (red) cables. It's not the first PSU I noticed that had the different materials, and I was wondering: 1) Why are there two different kinds of wire? 2) Is it OK to ignore the wire material and just splice all the blacks together, and all the reds together? Thanks!

Question by Morgantao 4 years ago  |  last reply 4 years ago


Possible replacement PSU for PC? Answered

I am fixing a PC for someone and I believe the power supply is dead. I have been looking for a replacement but can't find one exactly the same. It is also from a 'slim' model PC so the psu is smaller than normal. Here are the specs of the original: Input=100-127v ~6A, Output=220W, +3.3v=13A, +5v=14v, +12v=14A, +5VSB=2A, -12v=0.3A. I was wondering if this one on ebay could replace it. Do the Amps and wattage need to be exactly like the original?

Question by Arya42 5 years ago  |  last reply 5 years ago


WHERE IS THE FUSE INSIDE MY COMPUTERS PSU?

A WIRE TOUCHED A ALUMINUM HEATSINK INSIDE MY PSU AND NOW IT WONT POWER ON

Question by REALONE414 6 years ago  |  last reply 6 years ago


degital PSU transformr details needed ?

Hi all i got my hands on an old degital power supply unit , the model is : koocu 1501t it is 0-15 volt , with variable voltage and amperage see picure http://i00.i.aliimg.com/img/pb/172/988/490/490988172_927.jpg but unfortunately , it was not working i opened it , it has a big transformer with one pair of wires as primary (220 v) and 3 pairs as secondery ( green - black and yellow) search for datashhet or any details about the transformer , and found nothing i need to know the value of the three outpots voltages so i can replace them . thank you in advance , ad sorry for the bad english :)

Question by lu2a 5 years ago  |  last reply 5 years ago


High current variable voltage from an atx psu

What would be the most simplistic way to draw up to 10a on an atx PSU using variable voltage controlled by a potentiometer? I've looked at a few diagrams using the LM317 but it is limited to 1.5a. The only other VVR I can find is the LM350 but is still limited to 3a. Any ideas? I was thinking of stacking an arrey of LM350s in parallel but this doesn't seem like a viable answer.

Topic by andrewlapham2010 2 years ago  |  last reply 2 years ago


How do I use this PSU/ should I?

While ripping apart an old printer I found it had a nice looking "+5V/1.5A, +12V/3.5A" power supply. I tried searching for a data sheet, but couldn't find one. Here's a picture of it (top right). It's an "open frame power supply unit " made by APD, but they don't even list my model (APD-6018-50A1). Anyway, I tried plugging it in (careful not to get electrocuted of course) and seeing if it could run a large DC motor from the +12V, nothing happened, even when I tried it along with a 10ohm, 10Watt power resistor. It has some additional pins and I thought some of these might need to be shorted, like the green signal wire on an ATX supply, so i tried shorting the sets of pins, and one of them made the motor jump, but then it just kept "ticking" every half second or so; go, wait,go,wait, etc.. Un-shorting and re-shorting the pins makes it jump then tick again. Any ideas how to get it working, or should I stick with a hacked ATX PSU for my robotic power needs (automated airsoft turret)?

Question by Vick Jr 8 years ago  |  last reply 8 years ago


Voltage rail identification on LCD PCB

I am testing the DC rails coming off an LCD TV PSU so i can convert the unit to run off an ATX PSU. i have managed to find (labelled on the board) 12v, 12v, NC, GND, GND, GND, ?, ?  the last two aren't  labelled. the two pins (when tested to GND) are giving me -12v, could this be right? I'm guessing by this point ill just have to use the 12v rails, GND and -12v from the ATX to get this powered?  what else could those last two pins be? 

Topic by andrewlapham2010 1 year ago




Variable power supply? Answered

Is there a fairly simple circuit, method to making a desktop power supply running on 240v a.c mains supply with a user controlled variable output say 0-24v D.C with variable ampage upto say 1 amp. I may be over simplicating thing in my head but is it just a case of a transformer taking my mains input down to the upper most requirement ( 24v @ 1amp ) on the output, and the using some type of variable resitors on the output to further restrict the output to my requirement. I would be grateful for any guidance and information on this topic. Thanks to the community in advance.

Question by mickcaulton 10 years ago  |  last reply 9 years ago


how can i convert one 24v dc output into two 12v dc outputs? Answered

I am making a psu for my cctv system. i have a fairly new psu from a fire alarm panel which has battery terminals so it can still supply power even if the mains is out. my cameras can run on about 9-24v but my DVR needs exactly 12v 5a. The most logical thing to do i guess is convert the 24v output from the psu into 12v that i can then fuse off to go to different cameras and the dvr. trouble is i don't know how to. i thought of a voltage divider but it turns out they are bad if using more than a couple of Milli amps. would a voltage regulator do it? i'm abit stuck here so any help at all would be brilliant. thanks - luke

Question by ljarrald 8 years ago  |  last reply 8 years ago


Turning On an old PSU - When all failed

Hey there ! I have this old psu that came from an HP NetServer, Delta DPS-350EB, an old AT form psu and i just can't get it to turn on manually. I have a Dark Blue wire bundled with a ground that's coming from a ''pwr ON'' labeled pin in the psu, when shorted the psu come alive for 2 seconds then shut back off. I tried putting a load (CD drive) on the 5v with no success. Tried shorting all the other cable (those that i know aren't 3v, 5v, 12v + or -) with no succes. Anyone got an idea? Thanks Bill

Topic by wbzial 5 years ago  |  last reply 5 years ago


PSU shorting out when trying to power stuff?

I'm trying to build a bench top psu from a computer psu and so far its going good, except for one thing. I recently scrounged a 12v air compressor from a buggered car battery jump starter, and it runs fine, but whenever i connect it to the 12v and ground cables on the psu the psu just shuts itself off, does anyone know why? or what i can do to stop it from doing it?

Question by jockkitto16 7 years ago  |  last reply 7 years ago


Have a way to get 17 V from an PC psu? Answered

I need 17 V for a project, I have a few of old PC psus that delivers the common 5V and 12 V. Have a way to get 17V from it? I'm a newbie in electronics, a weblink with pictures is welcome. Thanks

Question by KnoBall 9 years ago  |  last reply 7 years ago


powering car stereo from computer PSU. how to keep settings?? Answered

Hello. i am using a high end car stereo, powered by my compouters PSU. i have sorted the red and yellow cables from the head unit, so it powers, but the problem is, that everytime i turn off the computer the car stereo looses settings. Since no one has done it on the instructables i have seen, i guess its hard to be done. has any one done it? i dont want to have the PSU 24/7. i would prefer an external battery...

Question by settra 6 years ago  |  last reply 6 years ago


Electromagnets, I'm wanting to make a magnet powered by a 1000W computer psu? Answered

How can I make a electromagnet that is powered by the 12v line on a 1000W psu from a PC? It needs to be as small as possible, it also needs to be as strong as possible it needs to carry around 200gr of weight, and I'd like to have it on for arround 2-3 hours without any possible dangers. Please explain me as much as possible?!

Question by trucker her 9 years ago  |  last reply 8 years ago


LED Power supply question

I've got an idea to build a LED light strip for some decorative lighting under a couple of shelves, but it's been more than a few years since I've used my GCSE-level electronics knowledge and I could do with a bit of advice regarding PSUs and parallel connections. I'm thinking of using  two banks of 10 of these LED packages powered by a wall-wart type 12v PSU.  If I wired the individual banks in parallel would I be right in thinking that that would be a current draw of 200mA per bank since each LED has a 20mA requirement, and if both banks were connected to the PSU in parallel I'd need a PSU capable of supplying at least 400ma?

Topic by megahurts 8 years ago  |  last reply 8 years ago


Do you add amps together? Answered

I guess I don't understand how amp ratings work. I want to use a 12v 5a power supply for a peltier plate. I am using a 2" cpu heatsink with a small fan attached to cool it properly. I tried it with a 9v battery and it worked but I want to use an AC to DC wall psu. The fan is 12v 0.12a. Do you add the amps together (5.12a) for the total? If so, does that mean a 5a psu is not enough? I don't want it to be too low and draw too many amps and damage something.

Question by Arya42 4 years ago  |  last reply 4 years ago



How do I test this PSU?

I had got this PSU for free from PC world, the guy who gave this to me does not know if it works or not... This is my first PSU, I never used one before...So I am asking you how to test this PSU. I hear they have safety wires that must be connected to another wire or something - I don't know...I hope you can help me... Thanks!UPDATEYay! My PSU works :-)Thank you all who helped me!And even better, I do not need to use a power resistor to keep the PSU on!

Topic by Plasmana 10 years ago  |  last reply 10 years ago


psu ground electricity produces voltage? Answered

I sware i was preparing for electrolysis experiment with my psu and i touched metal case of psu with my hands wet, and it was zapping me with electricity but not to high..........why?                          P.S: I used grounded cable everything is okay with ground in house, Before when i used it and touched it with dry hands it didnt zap me. I used it always before. But why isnt ground 0V.

Question by h0meIandsecurity 8 years ago  |  last reply 8 years ago


Using a Benchtop PSU to heat wires?

I modified a 300W ATX power supply that I got for $1 the other day to use as a benchtop power source, much the same way the people who have posted Instructables for this have done.  I want to do some experimenting heating up wires, but I don't want to harm the PSU.  I believe it has built-in short circuit protection, but I want to be safe anyways.  I think that if I put in a high-wattage resistor in parallel with the heating wire, that might save the PSU.  If I did this, what value resistor (ballpark range) would I need so that power would flow through the wire until it heated up too much (thus increasing resistance across it), causing the power to go through the resistor instead?

Question by Radioactive_Legos 8 years ago  |  last reply 8 years ago


24v power supply out of computer psus?

So i watched a video a while ago, it was about turning a psu into a lab bench psu. The guy said you can run 2 of them together making 24v, having to cut the (earth)ground on one of them and have them running to the same outlet. So i can have the 24v but what about 3.3v and the 5v? im not really sure how those would work, wouldnt they just stay at their normal voltage levels?

Question by knexsuperbuilderfreak 4 years ago  |  last reply 4 years ago


Charging A car battery with a PSU's 3.3 and -12 rails? Answered

Hello guys, is it safe for my car battery to charge it with a computer psu between the +3.3 (15 amps) and -12 (0.5 amps) rails, the multimeter reads a voltage of 15.2 between them, Thanks

Question by Ninjabdou 4 years ago  |  last reply 4 years ago


Is it possible to power an USB Hub from the computer's PSU? Answered

Is it possible to power an USB Hub from one of the unused lines of the computer's PSU? For instance, can I use the floppy drive's 5V to power the hub directly? Edit: I have tried to hook the hub directly to a 5V line from the psu (floppy connector), the computer won't boot and the dvd and hd lights keep flashing. I got a male molex connector from a broken floppy drive and found a plug that fits on the hub's power input. I checked for short circuits and correct polarization. When I plug the hub (just the hub, nothing else on it), the computer won't boot. When I unplug the hub, it boots as usual.

Question by garakawa 8 years ago  |  last reply 8 years ago


PC PSU question - convert 12volt wires to between 18 to 24 volts.

- i want to convert one of the 12volt wires up to between 18 to 24 volts. is there a simple "up-converter" that I can use? a jiggy that i can attach to do this? using a standard PC PSU.

Question by altomic 8 years ago  |  last reply 8 years ago


What happens if I pull to much power of my PSU.?

 I've got a B class PSU (600W)  in my pc, now I'm buying the CoolerMaster V10, which uses 70W, what happens if it does seem to be too much? I blow up my PSU? What excactly happens then? And I do not really care about blowing my PSU, but I do care about the rest of my system, can that get damaged too?

Question by trucker her 8 years ago  |  last reply 8 years ago


Are high power resistors really neccessary on a benchtop PSU conversion?

Was looking through the site and I was just wondering--why all the huge resistors on the bench-top power supply conversions of PC Power supplies? From personal experience this seems like a waste of perfectly good electricity.I know that they require some current to just stay on however in designing a project for my school's Engineering Technology department I found that the heat generated by such a small resistance (Around 10 ohms) was unacceptably high. Originally I was looking at Instructables and this sitethis site for inspiration but all the cooling measures taken to prevent the high power resistor from becoming a hazard seemed rather silly. A few calculations and experiments later with the 250 watt power supply and I determined that 160 ohm1 watt resistors and 1K 1/2 watt resistors were perfectly acceptable for the purpose of keeping the PSU awake and functioning. I connected one of each between each voltage and ground. According to calculations I can get away with dissipating a grand total of two watts or less spread across multiple resistors.The current divider rule dictates that if you add resistances in parallel, the resulting resistance will be smaller meaning more current will flow through the overall circuit. However this increased current will divide itself across the parallel resistances according to the rule Ix= RtIT/(Rx+Rt). The current through and power dissipated by the resistor you've soldered into the PSU will not change enough to be significant no matter how large or small a resistance you attach in parallel with it--with the exception of an effective short and what in God's name are you doing intentionally shorting the terminals of your bench-top PSU? Now several months later, the PSU is still operating happily and powering multiple micro-controller projects on a display board. Therefore I can reliably conclude that the high-power 10 ohm resistors in many computer power supply conversions are probably a gratuitous waste of wattage. You can get away with using a higher resistance and a resistor that dissipates much less current.

Topic by Psickattus 11 years ago  |  last reply 11 years ago


Blank screen for dual monitor support, bad PSU or Bad Video card

2 computers (X,Y) X is intel 478 1GBram 80 GBHDD (celeron 2.6) 200W PSU ATIradeon 9200(PCI), can get multy monitor on this system. Y is same litlle newer 2GBram 80&40GB HDDs (p4 3.0GhzHT prescott)  300W ATIraeon 9550(AGP) cant get dual monitor. onboard wont work if card plugged in.  2nd monitor plugge in with DVI-VGA Adapter.  it gets power but screen is blank.  ATI cat and windows recognizes both monitors but can't get video to display on 2nd.  I really ont want to buy a psu if I don't need one.... will  try plugging in 9200 PCI into Y tonight if it works then don't think its power supply (cuz it will be powering to vieo cards) anyone know what may be my prob...Also noticed when enabling in windows, screen resolution says it is 1024,0 (should be 1024,768)  lights are green on both monitors. when 1st monitor goes to standby second monitor follows.... Please before I lose all my hair... anyhelp?....

Question by liggy 9 years ago  |  last reply 9 years ago


If you connect the 12Vdc and -12Vdc on a desktop PSU do you get 24 Volts?

I used to understand more about electricity and electronics, i swear. I have used the yellow-to-red (+12 to +5 Vdc) method to create 7 volt dc connections for my desktop and xbox fans. I understand the concept of differences in voltage. Do these concepts carry over into negative voltage available on the ATX power supplies?

Question by Andale_The_Great 8 years ago  |  last reply 8 years ago


audio amplifier transistor? Answered

I pulled what looked like a voltage regulator from a PSU, i guess as it turns out its not? apparently its a audio aplifier transistor, but what would that be doing in a PSU? if its any use, it was near a fan connector on a small sub-board... markings are: UTC 2SD880 (2 small, undistinguishable letters)RKOB (or 0B) i believe this is the datasheet, correct me if im wrong. http://search.alkon.net/cgi-bin/pdf.pl?pdfname=utc/2SD880_TO220.pdf

Question by zack247 8 years ago  |  last reply 8 years ago


How to combine AT and ATX power supplies to power same system (motherboard)?

Hello,   I am struggling to upgrade a certain medical system . The device I have contains an old motherboard which powered by an AT power supply. My problem is that the power supply board (which supplies the AT power) has other functions, and there's no way to be replaced (by an ATX PSU). I already bought the motherboard: http://www.ibase.com.tw/2009/MB970.html , with INTEL core i5 CPU  Cry Cry. I can't risk my power supply board in attempting to operate the new parts (motherboard, CPU, 4 Gb RAM, CPU fan, SATA harddisk, and DVD), I believe it won't stand that kind of power consumption. I know you'll say this won't work at all -I know, but I was thinking about using voltage regulators to generate the 3.3 v rail from the same AT power lines. OMG I really need help about: How I can connect the AT and ATX power supplies to this motherboard (and to the other parts), ensuring that I am not risking my AT power board at all?. Another headache is that the AT power board has to work at the same time with the motherboard. And in order for the system to work the AT power board has to work (you know that a feedback circuit should be completed) that's why it should be connected to the motherboard.   This really became a challenge for me. I can't stop thinking, planning, and dreaming about it. If you have any idea or any experience about this, I would like and hope to hear from you...

Question by muhammad.shamut.7 4 years ago  |  last reply 4 years ago