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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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ATX hard disk activity led wiring [migrated]

How is the hdd activity led wired according to the ATX specification? Is it like this? simulate this circuit – Schematic created using CircuitLab If so, what is the 5V voltage relative to? PSU ...
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1answer
50 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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121 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
122 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
547 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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487 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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56 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
661 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
535 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
126 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
481 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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676 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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3answers
432 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 ...
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1answer
86 views

female 6 pin pcie power plug?

i am looking for a datasheet, or ideally an eagle library, that has a female 6 pin pcie power plug, like this: as easy as it seems, i cannot seem to find ANYTHING online.
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34 views

Water pump, PSU and surges

I've got a home-built watercooler that I've been using for more than a decade on my personal PC. The unit has a single switch for the AC mains (120V 60hz) that splits to power both the AC waterpump, ...
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1answer
453 views

Is it electrically safe to use an ATX PSU's PCI output for SATA/MOLEX instead of graphics cards?

My question here is about electrical safety of a proposed PSU cable hack. The situation is a single rail 1600W PSU (to avoid partitioning of the current) that has to power some 20-24 HDDs. I've ...
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1answer
130 views

Hub usb connected to ATX of the same desktop pc [closed]

I am new here and I am newbie in electronic. I studied electronic a lot of years ago. I am attempting to connect my usb hub to 5V output of my ATX of desktop pc, as explained here: Can an ATX PSU ...
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2answers
65 views

Filtering Voltage Spikes on Split Power Cable

I have a test set up that can more or less be broken down like below: simulate this circuit – Schematic created using CircuitLab The splitter shown is custom made for testing, here is a drawing:...
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0answers
74 views

Molex 5556 vs. 44476 Terminals for ATX / EPS connectors

I'm looking into terminating a custom-length power supply extension cable to make everything look nice / fit in an awkward case. While researching parts I noticed that the EPS12V v2.0 specification ...
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2answers
3k views

ATX PSU With only +5VSB output [closed]

I am searching some thread about but i don't find it. 3 days ago. My ATX power supply has burn by overheat. Thermaltake TR2 600W. it has a OTP and even with that it hasn't turned off. Blown by ...
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1answer
281 views

What will be the current of a 24V ATX power supply?

I have an ATX power supply with a +12V 8A line and a -12V 0.8A line. I assume if I used the -12V as ground to provide 24V, then the maximum current provided by the 24V line would be 0.8A?
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324 views

Can I use a tactile switch as computer power switch? [closed]

I was thinking of replacing my broken power button in my CPU with a tactile switch connected to the power cord on the motherboard, but I was wondering if that would work without any harmful ...
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1answer
1k views

Would an ATX PSUs internal fan work as the dummy load for a benchtop power supply conversion?

The PSU has 2 12V rails listed in its specs on the side, however both show continuity between them when I tested it with my multimeter. I then tested continuity between the positive from the fan and ...
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1answer
104 views

Is it safe to toggle a led strip powered with 12v ATX PSU line?

I connected a segment of a led strip (12v) to a line coming from a standard ATX PSU (12v line, of course). I just wonder if it is safe to put a toggle switch to turn on/off the led strip, or may be ...
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1answer
290 views

How much current the PS-on pin on the motherboard's power connector can sink?

How much current the PS-on pin on the motherboard's power connector can sink? can it sink 100-200mA? (to activate a relay/solid-state-relay when the motherboard wants to turn/keep on the computer) (...
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1answer
966 views

ATX PSU as bench power supply. Voltage dropping issue

I am trying to use a PC ATX PSU as a bench power supply in order to achieve a high current 5V and 12V supply. The PSU is 550W and I am using a single SATA power connector (to connect to the device to ...
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1answer
1k views

What is this transformer-like component, and why is it not really connected?

Recently, a power surge took out a few components in my PC's ATX power supply. While repairing (I hope), one component in the power drew my attention. I'm an electronics engineer, but I'm confused ...
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1answer
812 views

Need help to find correct values for dummy load resistor

I am working on converting an old ATX PSU to a DIY lab bench power supply. Everything is going well, but I can't seem to find out the correct dummy resistor load values. The 3.3v rail has 22A and the ...
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145 views

Why does the output voltage from 180W ATX PSU on +12V rail deliver only +9.6V to +9.7V?

I recently got three ATX PSUs which I plan to use as bench supplies. I've successfully managed to get one of them (250W) converted and running as bench supply. But the other two a 150W and 180W. The ...
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2answers
92 views

Do I need PSUs with similar current rating when I connect them in series?

I need a 48V power supply with 20-25A so I decided to use old ATX power supplies I have lying around. I know already that the series of ATX PSU can be used to charge lithium packs for RC planes, it ...
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1answer
55 views

ATX 12V DC supply

I am using PSTC-12500 power supply unit to power up USB cameras. On the datasheet it says it can provide upto 60A on 5V rail. I highly doubt it, cause our system requires not more than 34A on 5V rail. ...
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1answer
133 views

Modifying ATX SMPS into bench-top power-supply

Due to low cost and high output current this project is pretty famous in DIY category, and I thought to give it a try too, but a lot of people are connecting so called Load Resistor on the terminal ...
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2k views

Is this resistor sufficient as dummy load in an ATX 250W Dell PSU?

I have attached a 20 Ohm resistor to my Dell PSU on the 5V rail since its a 2004 PSU and most of the current is on the +3.3V & +5V rail. I have seen on most youtube videos where they mention using ...
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1answer
506 views

Is there any way to modify the output voltage of a laptop adapter from 18.5V to say 7V or 13.6V?

I have an old 18.6V 6.5A adapter from an old HP docking station. I tried to open the adapter and saw an small pot inside it, tried turning it but the out just remained constant and there was no change....
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1answer
67 views

Does ATX specify the load currents?

I find it difficult to see the elecrtical specs of ATX PSU. You can, for instance, have this cheap block or another one but their homepages just say that PSUs are ATX-2.2/2.31 compliant and I see no ...
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3answers
2k views

Combine multiple ATX power supplies?

For several different projects, I need high current DC power (25-50 Amps). The first project needs roughly 50 Amps at 12 volts, which isn't something one ATX can provide on its own (at least I don't ...
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447 views

Advanced ATX Power Supply Modifications

I know there are multiple tutorials and questions regarding converting an ATX power supply, new or old, to a benchtop power supply for projects. I'm fully aware of how to make the basic conversion to ...
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1answer
567 views

Old ATX PSU: Could +5VSB have a minimum amps requirement?

I'm trying to use a small ATX power supply (version 1.0 connector) as a bench power supply. I've found that it only turns on intermittently. I've tried with ~1A load on +5V, and 0.2A on +3.3V . I ...
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1answer
510 views

ATX - replace passive PFC to active

I have some ATX PSU with passive PFC (huge coil with capacitor). I also have some active PFC from other ATX that based on L6561 IC. This psu will handle odroid xu4 board and few led strips based on ...
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1answer
389 views

Selected ESP8266 WiFi modules short out ATX power supply

I have a test circuit connecting an ESP-8266 WiFi module to a MAX7219 LED driver. The setup is powered by a modified ATX power supply for both 5V (the MAX7219) and for 3.3V (the ESP-8266). The setup ...
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3answers
2k views

Parallel ATX Power Supplies [closed]

I wanted to ask the question about two parallel power supplies. I was asked by a friend if these would be a good idea Add2PSU ATX power supplies can vary quite a bit (more than a few mV) One can be ...
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1answer
1k views

ATX PSU +12V outputs connected in parallel

I need +12V and around 10A for my project. Each wire on the ATX supply I bought is stranded 20 AWG and is rated for less than 10A. What would happen if I connected multiple +12V wires in parallel to ...
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3answers
239 views

Is it safe to frequently restart an ATX power supply

I'm powering five Arduinos and four LED strips (600 LEDs total) from an ATX power supply (CoolerMaster B2 Series 700W). Four Arduinos drive the four LED strips, and the fifth Arduino periodically ...
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2answers
842 views

Galvanic isolation between AC input and DC output?

An ATX motherboard is grounded to an ATX PSU thru the ground wires, from the 24-pin power connector to the PSU. Is there (inside the ATX PSU) galvanic isolation between the DC output and the AC ...
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3answers
843 views

Cluster Raspberry Pi power supply from an ATX PSU

I've asked this question within the Raspberry Pi exchange but they stated that posting the question here might be more useful. I built a Pi cluster with 6 nodes. This runs off a 90 watt astec atx-93 ...
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4answers
4k views

Connecting two atx power supplies in series

My problem is I've bought a 3d printer from china. As usual with consumer electronics the psu is a heap of shit. I've read on forums you can connect two atx supplies in series to generate 24v ...
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2answers
149 views

Converting ATX PSU to lab bench PSU

I am currently trying to convert my ATX PSU to lab bench PSU. But I ran into a problem. I want to attach a dummy load, but I am not sure if I should use 12V or 5V. On label it says that ...
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1answer
938 views

Why did I burn my L9110s H bridge

I have recently bought a L9110s H bridge (pictured below), and while testing I accidentally burned it up. I'd like to know why, to avoid making the same mistake and if maybe I should try to get a ...
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1answer
618 views

Mini Workbench Adjustable Power Supply

I'm trying to design a mini workbench power supply to use for small electronics that is powered from the 12V rail of an old ATX power supply. I want it to be able to provide an adjustable voltage of ...
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2answers
427 views

Use ATX power source to power Raspberry Pi

I'm setting up several Raspberry Pi's and Arduinos connected together, and I'm looking for a way to power them. Would it be possible to adapt an ATX stock power source with female USB plugs using the ...