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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5answers
29k views

Does an ATX PSU's PS_ON Signal Require Resistance

As the title suggests; when connecting the PS_On signal directly to ground in order to switch on an ATX PSU, is there a required amount of resistance? - To try to clarify my particular problem; I ...
7
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3answers
21k views

Using PWR_OK to Activate an ATX Power Supply Automatically

Okay so, I have an ATX PSU that isn't connected to a motherboard, and I'm currently using the simple paper-clip trick to ground PS_On in order to trick the PSU into ...
15
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5answers
46k views

24V 3A from ATX power supply?

I am looking for a cheap way to get +24V DC max 3A from computer power supply. I prefer easy soldering solution like DIP, and standard components that do not need to be purchased over internet. Any ...
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2answers
8k views

ATX power supply front-end: How does this work?

I've been trying to educate myself on general power supply operation and stumbled across several schematics for ATX power supplies. In general I understand how a SMPS operates, and an ATX PS is just ...
0
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4answers
8k 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 ...
2
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5answers
4k 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 ...
4
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2answers
9k views

How to make my own atx power switch?

I'm assembling a new computer from components. It's something I've done quite a few times, but now I would like to skip the case. Except for some structural integrity and LEDs, the only technical ...
11
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2answers
17k views

Can an ATX PSU power a USB port directly?

I'm going to build a benchtop PSU from an ATX PSU, and I would like to add a USB charging port on it. It should be able to power an Arduino or charge my (non-Apple) phone. (I know Apple devices ...
3
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2answers
4k views

Can I get 24V from ATX PSU using 12V and -12V cables?

ATX PSU's have one -12V cable, and a few 12V yellow ones. Could I power up a 24V device by connecting 12V to + on the device and -12V on -?
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3answers
4k views

Parallel ATX Power Supplies - for more power and redundancy [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 At first thought it looks very simple and good idea to connect 2 ATX PSUs ...
7
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2answers
6k views

Fixing an ATX PSU

I have an 800W ATX power supply given to me by a friend because it doesn't work any more. It's quite a beast and would set me back a considerable amount new, so I'd like to see if I can fix it. Well, ...
5
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1answer
2k views

What is the capacity of capacitors in this power supply circuit?

Imagine the following circuit with two capacitors and diodes acting as passive PFC. My question is what is the capacity of these two capacitors? I mean compared to a circuit with just a single ...
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2answers
656 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 ...
3
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1answer
1k views

ATX power supply specification question

I read the ATX power supply design guide, and I have a question related to the PWR_OK line specifications. In "Table 21. PWR_OK Signal Characteristics" I saw the following: "Logic level high - ...
3
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2answers
3k views

Does an ATX power supply have any isolated outputs?

I am working on an application that requires isolated power inputs. Wondering if the standard ATX PSU has any isolated outputs? Why are we having multiple ground pins on the Connector?
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2answers
363 views

Powering a DC to DC power supply that came without an adaptor

I bought a mini ATX DC to DC power supply on eBay to use with a motherboard. Unfortunately I did not notice it came without any kind of adaptor. So what I have is basically two wires, red and black, ...
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2answers
2k views

Dangers of Old ATX Power Supplies?

I was tearing open an old ATX power supply from one of my old computers today, because it was making a funny high-pitched wining noise. I noted that several of the components within were starting ...
0
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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 ...
0
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1answer
829 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 ...
0
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4answers
9k views

Troubleshooting PCB of an ATX power supply? [closed]

Im new to PCBs, know the basics of electronics and testing of individual components. I have a PCB (of an ATX supply) that is not working when I power it, so I thought of testing each components like ...