Questions tagged [atx]

ATX is the standard for PC power supplies. It has +3.3 V, +5 V, and +12 V. They share a common ground. It has a PS_ON# signal which needs to be grounded to turn it on. Don't open power supplies that run on line voltage (AC). They have dangerous voltages and currents inside

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1answer
37 views

How to determine preload resistance needed for an ATX power supply to power up?

I want to make a benchtop power supply from a 20 pin ATX power supply from the last millennium. I have seen posts, but still need help. So far, I have shorted PWR_ON to ground and have connected an ...
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30 views

15v from 20pin and/or 24pin ATX Power Supply. Connecting PSU circuits in series

I have a portable 12v car battery charger, jumper, maintainer, and inverter with integrated USB ports, 12v car adapter slot, jumper clamps, emergency LED light, and a 3 prong 110v/60hz wall outlet. It ...
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4answers
114 views

Using ATX power supply in industrial electronic projects

I have two main questions: 1. Can you use ATX power supplies in industrial projects? I see lots of DIY projects where they convert an old ATX PSU into a lab bench power supply or powering DIY projects....
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32 views

Grouping 12V ATX lines for measurements

I'd like to measure the power draw of my CPU. The way that seems the most straightforward to me is to cut into the ATX12V cable and put a shunt based sensor in the middle of the 12V line. Now in the 4 ...
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2answers
82 views

ATX PSU and offline UPS compatibility

Specifically how well can an ATX PSU and in turn the Computer it is powering cope with power loss for x miliseconds during the changeover from Grid AC to offline UPS inverter AC Can I use offline UPS ...
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104 views

Powering many external 3.5" HDDs (USB) by an ATX PSU

I have many external USB disks like this one, that I would like to power from a single dedicated ATX PSU, instead of one 12V power adapter per disk. Because each power adapter would take one power ...
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3k views

Why are DC-DC ATX converters so big?

I watched an interesting video in which the caster reverse engineers a modern 850W computer PSU. From this teardown one can see that 90% of the bulk of the PSU is devoted to synchronous conversion of ...
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1answer
76 views

ATX PSU turns off under heavy 12V load, unless increased gradually

Following the well known instructions I've built the PSU from a spare 500W ATX. I've used 10 Ohm resistor for artificial load on 5V line. When I connect 1A load to 12V line, the ATX shuts off. I need ...
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1answer
53 views

Use a PC PSU for powering a Raspberry Pi cluster and number of 5V+ cables

I need to power a cluster of 8 Raspberry Pis 4 and I have a 480W PC PSU with a maximum load of 28A on 5V+. My question is really simple and dumb (sorry for that) but I did not found a precise answer, ...
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60 views

Computer power supply outputs 5.20 volts at 3.3 volts rail

I got an old 420 watt Tagan power supply. It seems pretty good quality. I wanted to convert it into a bench power supply. It worked fine until I THINK I messed things up. I’m not sure if i actually ...
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58 views

Figuring out ATX Power Supply max output

I have a Delta DPS-400AB-17B power supply, and I am planning to change over some of the connectors to different ones. I want to make sure I don't overload any of the 12v 18awg wires, so I am figuring ...
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100 views

ATX Power Supply Pin Material? (gold or tin)

I'm planning to use an ATX power supply to power a small set of 12v devices. I've read plenty of guides about adapting ATX -> bench supply, but I can't seem to find any mention of the connector ...
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1answer
95 views

Is it bad to load one rail of a power supply vastly more than the other?

I am trying to modify a Delta DPS-400AB-17 server 1U power supply to support a desktop motherboard and graphics card. The power supply has an 8 pin 12V EPS connector attached to a 21A 12V (252W) rail. ...
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125 views

How to calculate the average current

I have an ATX which the yellow wire is "+ 12 v ,18 amp" and "blue is -12v , 1 amp". When I use them together I got 24 v but I am confused how to calculate the max ampere. How to ...
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87 views

ATX power supply turns off when used with DIY boost converter

I am trying to build my own step-up boost converter. I have my connections as shown in the following schematic (except for the one circled in red.) First I powered up my step-up module with a ...
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1answer
177 views

can atx power supply the intel nuc and egpu [closed]

So I want to power my Nuc (mini-pc) with ATX psu and the reason is I built my own egpu(external graphic card) and i would like to throw the nuc in there powered by the same psu that runs the egpu ...
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85 views

ATX power supply doesn't cut the current after being turned off

I made a power supply for my electronic projects using a ATX power supply of a older computer and used a button connecting the black and green wires to turn it on/off. I noticed that sometimes when I ...
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1answer
98 views

ATX PSU turns itself off when uploading sketch to Arduino

I'm trying to power a stepper motor with the 5V rail of an ATX PSU and control it using arduino. To keep the PSU running, I have shorted the PS_ON pin to ground. ...
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1answer
98 views

Building my own on-off button for a PC

I'm looking to build my own power button for my computer. Most motherboards have a pair of PWR_SW pins that your case power button typically attaches to via two ...
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1answer
60 views

What could be the reason an ATX PSU triggers OVP?

I have a broken MARS MP600 PSU that I am trying to repair. Everything looks good but when I turn it on (grounding PS_ON) the outputs do not maintain the voltage. The output signals go to the rated ...
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1answer
124 views

ATX power supply doesn't turn off after PS_ON wire is disconnected from GND

I'm using an old ATX power supply to power a PlayStation 3. I've built a small circuit to make the power supply only fully turn on when the PS3 is turned on, by using an optocoupler that connects the ...
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1answer
43 views

Can I use 1 yellow 12V wire to power 2 12V pins?

I'm trying to mod a C8220 Dell (mini 18-pin power) from an old ATX supply. I want to know if it's okay to use 1 yellow wire to supply 2 yellow sockets on the 18-pin. Thank you.
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1answer
78 views

Converting negative voltage to positive

I am adding an ATX power supply as a bench power supply to power accessories on my model railroad layout. I prefer to run some lighting accessories at +7v, but obviously a power supply has +3.3v, +5v, ...
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1answer
43 views

Swapping power supply - need clarification on grounding (AG & DG)

The internal power supply on my Yamaha keyboard was broken while moving house (PCB is nearly snapped in half) and because it's 30+ years old it's not easy finding a NOS part replacement. I've found ...
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1answer
764 views

How to make +12v standby power from ATX power supply?

Can I make a 12v SB line from the existing lines on this ATX power supply? I'm told that +/- 10% voltage is acceptable. Can I combine a (red + orange + purple) 5V + 3.3V + 5VSB = 13.3VSB? I'm working ...
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84 views

How safe is to work on an ATX PSU as a bench power supply?

I'm trying to convert an old ATX PSU into a workbench supply. I saw there are many safety warnings about discharging the internal capacitors before opening the PSU. I'm not really concerned with it as ...
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1answer
64 views

ATX Power supply and its protective features - not happy with motor as load?

I'm building a chicken coop opener - I've build my circuit (let's say arduino) with a DS3231 clock module and if functions as follows: My DS3231 will pull down its interrupt pin which is connected to ...
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1answer
539 views

Creating a DC input ATX power supply using buck converter

I am working on a project which requires me to use a battery to run a computer. I planned to work with a 24V battery connected to a DC input (24V,1000W) ATX power supply and connect it to the PC. But ...
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62 views

Windshield motor with ATX power supply keeps shutting down

I need to connect my windshield motor (12V) to my ATX power supply from old computer. I've tested the motor on my bench power supply and i draws around 1,5A @ 12V, so it should be well in range of the ...
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1answer
107 views

If I use a 19V 4.7A supply to a MAX 250W ATX power supply am I an idiot or should it be safe enough?

I can do the maths, I get near 90W, but I'm only planning to draw under a quarter of the power supplies (ebay link) rated max of 5V/12V combo (estimated load 30W). I therefore consider my 19V old ...
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0answers
300 views

EPS12V 8pin from ATX PSU with two separate 12V rails

This is your standard EPS/ATX12V connector used for feeding the main processor VRM on a computer motherboard. The two 4pin connectors can be attached together to create an 8pin connector. The top four ...
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67 views

Reason for capacitor on ATX 12V+ wire

I'm using a computer PSU to power several controller boards and sensors. To be more precise, I'm using the 24pin ATX connector wires to power everything. There are two 12V+ wires coming from the ...
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2answers
406 views

Remote controlling an ATX power supply

First of all i hope you will all excuse my spelling as i am Dyslexic. I have two computer cases one is fully outfitted and has a sas expander to run 16 hard drives in it with a breakout to a ...
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1answer
58 views

Powering up analog part of the video card

I am designing the video card for the device mainly powered by the +5 V of the ATX power supply. The digital part of the video card is also powered by the +5 V supply, as well as analog part. Analog ...
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89 views

Abusing EPS connector to power LED's?

I'm working on the wiring harness for a PC build that's going to include a bunch of (5050) LED strip lights. The strips will be wired to fan connectors (more details at end). For testing, I've been ...
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1answer
256 views

Center tap transformer pairing with ATX PSU

I'd like to use both a beefy center tap transformer (220v to 24-0-24, 1000VA) and an ATX PSU togheter, to power some lab equipment. So I isolated from case the ATX GND on DC side as the case is earth ...
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5answers
3k views

ATX power supply minimum load

I know this is a commonly asked question but most of the answers I got are more than 5 years ago. So basically, my friend found a ATX power supply and was going to give it to me. Since I already have ...
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1answer
129 views

How come PC/laptop power suppliers have much higher wattages per physical size than laboratory switching power suppliers?

This 2.2 kg 1000W BeQuiet BN213 ATX power supply is able to provide 12V 83A (no typo. Eighty-three.), which is around 1000 W. This huge PS900W (60V15A 30V30A 15V60A) bench power supply weighs 5 kg ...
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1k views

ATX power supply won't turn on when connected to motherboard

I am troubleshooting a problem with a power supply for an HP EX490 Mediasmart server. The power supply no longer powers on when the power button is pressed on the back of the server. I have ...
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1answer
969 views

DIY ATX PSU turns off when attaching load on 12V rail

I want to convert my old ATX power supply to a simple bench supply for 12V devices. On the label it says it's a 300W PSU where I can use 264W on the 12V rail (see image below). https://imgur.com/...
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1answer
451 views

Mainboards ATX “PWR_OK” signal fried [closed]

I've been struggling here trying to find out what exactly went wrong, but I just can't. I messed around with a power supply and decided to wire up my own with 3.3V, 5V, 12V and all other connections ...
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3answers
3k views

How does an ATX power supply turn off?

It's well-known that for powering up a standard PC power supply, its PS_ON# line must be momentarily pulled low (i.e. connected to GND). But how does the motherboard actually turn it off?
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3k views

Wiring up ATX PSU to power (several) 12V LED strips

(In advance, please pardon my ignorance; I'm still learning) TL;RD. I want to power N number of 12V LED strips using a PC ATX PSU. Is it safe & what bits do I need to add to make it function as ...
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106 views

ATX 12V power supply fan required or not at low current?

Does ATX power supply really need its cooling fan when drawing only 3A at the +12V rail? I know that the fan is mandatory when it's running a computer that draws 200 Watts and above but is the fan ...
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1answer
2k views

how to repair ATX PSU 5VSB problem [closed]

The 5VSB rail puts out voltages that are way out of the nomial range. It sweeps from 2.5 to 7.3 V or better said, jumps values randomly. All other rails are ok. The PSU turns on fine, but sometimes ...
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2answers
1k views

PS_ON to GND with MOSFET to turn on ATX PSU

i've built the following circuit to short the PS_ON to GND and turn on a PSU. The problem is that, despite the pull-low resistor or the state of the switch, the MOSFET will always be on. With this ...
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1answer
443 views

Powering 64 SATA HDD from Single ATX Power Supply

I am planning to wire a 4U DIY JBOD top loader. Looking at the power output of several power supplies they have a a maximum rated 5v rail of 100-125w. By looking at the spec sheet of my chosen HDD I'...
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2answers
836 views

1250w ATX Power Supply Serial 24v Question [closed]

I have a ZM1250-Platinum model ATX Power Supply. It's the first I've considered making into a bench power supply that has two +12v outputs instead of just one: +12v1 @ 45A and +12v2 @ 65A. Even though ...
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3answers
2k views

How safe is parallel wiring two ATX PSUs, if they weren't explicitly sold as dual PSUs?

Pages such as this discuss wiring ATX PSUs in parallel, in what seems to be a sensible manner, with links to various projects showing details. Companies with a decent reputation for ATX PSUs, sell ...
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4answers
1k views

Type of Header for Motherboard PWR Switch

I am trying to make my own 2-position connector cable to connect a Rasberry to the PWR_SW's PWR and ...