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.

Asked by Raikou6 9 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

Asked by srainsdon 7 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

Posted by GFXMihnea 5 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.

Posted by valmont325 6 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 Thanks  

Asked by making9719 4 years ago



Asked by REALONE414 6 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)?

Posted by tylerb 10 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.

Posted by andrewlapham2010 1 year 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.

Posted by bprins 2 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? 

Posted by andrewlapham2010 1 year 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 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 :)

Asked by lu2a 4 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)?

Asked by Vick Jr 7 years 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.

Asked by mickcaulton 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

Asked by ljarrald 7 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?

Asked by jockkitto16 6 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

Posted by wbzial 4 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

Posted by wbzial 4 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

Asked by KnoBall 9 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...

Asked by settra 5 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.

Posted by PKM 9 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?

Posted by megahurts 7 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?!

Asked by trucker her 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.

Asked by Arya42 3 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!

Asked by didgitalpunk 6 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!

Posted by Plasmana 9 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.

Asked by altomic 7 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?

Asked by knexsuperbuilderfreak 4 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 ;)

Posted by T3h_Muffinator 10 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.

Asked by zack247 7 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.

Asked by garakawa 8 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?....

Asked by liggy 8 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?

Asked by Andale_The_Great 7 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.

Posted by Psickattus 10 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: , 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...

Asked by muhammad.shamut.7 3 years ago

Wall Wart question.....

I have an NCE cx12v500 direct plug in class 2 transformer in the form of a wall wart. I accepts the USA standard of 120 vAC in, at 60 Hz, and outputs 12 vdc @ 0.5 A. I thought this was the recharging unit for my portable drill, and so I plugged it in. After a few hours of charging, the drill moved but was sluggish. I unplugged it, and when I tested the output, it had dropped to around 1 - 1.3 vdc. I can't seem to find a way into the unit either (molded plastic) without sledge hammer or hacksaw usage coming to mind. Did I fry this one I think I did, but I am looking for a possible, no and solution from someone :-) Aaaargh ! I took it apart finally sawed a notch in it and pried it open... and there was #1: NO regulator *sigh*, and #2: NO fuse of ANY kind, and #3: just a tiny board with a 1,000 uF cap on it and 4 diodes (bridge configuration) by one I took components off and tested them with my VOMM and sure enough, all the components were good. Then I tested the transformer......and both sides should have tested closed or short, but one side (output) tested OPEN. *sigh* It fried the transformer ! :-(

Posted by Goodhart 9 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?

Asked by trucker her 8 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

Asked by Ninjabdou 3 years ago


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!

Asked by newrev426 7 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.

Asked by h0meIandsecurity 7 years ago

Can I power a laptop with a desktop psu?

I am planning to put a laptop (HP ENVY dv7-7334ea) into a desktop case for a project and I was wondering if anyone could help me out with trying to power it with a desktop psu instead of the charger? I believe it needs 18.5v at 3.5a. If anyone knows anything about this your help would be greatly appreciated!

Asked by pac-man 3 years ago

we dont have 5v on usb after shutdown, why are we trying to power it from psu if psu has no powerout after shutdown?

We dont want power on usb port after shutdown we connect it via molex molex after shutdown doesn't have power too? if we dont want to supply 5vdc from usb after shutdown, why are we connecting it to PSU which doesn't supply 5vdc after shutdown either?

Asked by w477s 8 years ago

ive had a few PSUs that dont stay on, can i fix them? Answered

Ive had a fair number of Antec 350W psus that will attempt to turn on, but dont. its almost as if they dont have the capacity to do it or something. ive been wondering, since its not capacitors (there are 2 small ones that are usually failed, replacing them does not fix it) could it be the mosfets? im wondering because ive had a lot of these (at least 10) from computers and all but one had the same symptoms, the one that didnt had a chip blow up on it. but it seems like a waste to take just the fans, connectors and switch if it has one and dispose of the rest, i want to be able to reuse as much of the PSU as possible, even the main transformer and the two smaller transformers if possible. any ideas on what i can reuse (literally anything i can reuse) or how i can fix them?

Asked by zack247 6 years ago

Need to find the standby line on a power supply for a motorola dcx3400 cable box to run an original Xbox?

I had purchased the box from a resale shop to use for parts. It occurred to me that I could use the PSU to power my blown xbox. Both are manufactured by Delta. So I used my multimeter (first time using one) to get a pin out of the psu at the connector. 16 pins from top to bottom as shown. I know i rounded off these values and I can go back and use the slight variations in readings to find "rails."(?)My issue is as far as I can tell, all of the pins are powered when the psu is plugged in, and I cannot tell which is the standby if there is one. What test can I do to find it? And if there is no standby, can I safely use this to power an xbox? thanks for your time, -sk8er6

Asked by sk8er6 2 years ago

Do Laptops have a "Power On" signal?

I was thinking of trying a project in which I do a custom watercooling setup on a gaming laptop of some kind. I would like the loop to power on and off with the laptop itself, but I don't want to use USB power or something like. That made me wonder if laptops have a power on signal, like desktop psu's have. Do they have it or something similar to a power on signal?

Posted by Dashing Rainbow Dash 1 year ago

Grounding yourself w/ a suitable ESD wristband without a PSU

So I do not own a laptop or any personal computer as I have no need for either of them (until I get deeper into electronic tinkering with an Arduino, etc). I do have an ESD wristband that I bought from a local computer store that has an alligator clip on the end. I've done a bit a research, but only getting mixed answers as to how I can ground myself without a PSU. I'd like to guarantee that I don't fry any of the beginner electronic projects that I plan on doing. How exactly am I supposed to ground myself with an ESD-wristband? I do own rubber Nike sandals (open-toe) that I don't mind wearing to help avoid frying any electronics, have a wooden surface on my workbench, but my workstation area is all on carpet. Thanks in advance!

Posted by TXVisual 1 year ago